Soft-core battery pack capable of improving stacking safety of battery cores

Abstract

The utility model discloses a soft-core battery pack capable of improving the stacking safety of battery cells, which comprises a soft-core battery module assembled in a battery shell, and the soft-core battery module is formed by stacking and assembling a plurality of soft-core battery cells; an expansion space is reserved between the adjacent soft package battery cells, and the expansion space is filled with an elastic buffer body tightly attached to the soft package battery cells; when the soft-core battery pack enables the soft-package battery core to expand or contract to change the volume in a charging state and a discharging state, the elastic buffer body is correspondingly compressed or expands under the action of self elasticity, so that the elastic buffer body keeps filling the expansion space to adapt to the volume change of the soft-package battery core. According to the utility model, the expansion space for filling the elastic buffer body is reserved between the adjacent soft package battery cells, so that the elastic buffer body can be utilized to carry out space self-adaptive filling when the volume of the battery is changed during charging and discharging, thereby improving the stacking and assembling compactness of the soft package battery cells and ensuring the safety of the battery.

Description

Technical Field

[0001] This utility model belongs to the field of soft-cell battery pack technology, and in particular relates to a soft-cell battery pack that improves the safety of cell stacking. Background Technology

[0002] In soft-cell battery packs, expansion is mainly due to the intercalation and deintercalation of lithium ions in the positive and negative electrode materials, which causes the thickness of the positive and negative electrodes to expand or contract. The micro-stress generated by the expansion of graphite lattice is the main driving force for electrode expansion. In some cases, the charging thickness expansion can reach 3.4%, and the discharging volume contraction can reach 3.1%. Expansion and contraction seriously affect the stacking safety and compactness of soft-cell batteries, posing significant safety hazards. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a soft-cell battery pack that improves the safety of cell stacking. It can use an elastic buffer to adaptively fill the expansion space when the volume changes during battery charging and discharging, thereby improving the compactness of soft-pack cell stacking assembly and ensuring battery safety.

[0004] Technical solution: To achieve the above objectives, the present invention provides a soft-cell battery pack that improves the safety of cell stacking, comprising a soft-cell battery module assembled inside a battery casing, the soft-cell battery module being assembled by stacking multiple soft-pack cells;

[0005] An expansion space is reserved between adjacent pouch cells, and the expansion space is filled with an elastic buffer that fits tightly with the pouch cells. When the pouch cells expand or contract during charging and discharging, the elastic buffer is compressed or expands under its own elasticity, so that the elastic buffer maintains the filling of the expansion space and adapts to the volume change of the pouch cells.

[0006] Furthermore, the elastic buffer body is provided with connecting bodies on its length side and width side, and the elastic buffer body is connected to the side of the pouch cell through the connecting bodies; when the pouch cell expands or contracts, the elastic buffer body changes its thickness and shape, and at the same time, the connecting bodies drive the elastic buffer body to expand or contract in the length and width directions.

[0007] Furthermore, the middle part of the connector is connected to the side of the elastic buffer, and the two ends of the connector are respectively connected to two soft-pack battery cells on adjacent sides.

[0008] Furthermore, the connector is a rigid and insulated connecting plate structure.

[0009] Furthermore, the elastic buffer includes a silicone sheet, and both sides of the silicone sheet are respectively covered with a heat-insulating structural layer.

[0010] Furthermore, in the soft-cell battery module, the thickness of the elastic buffer body disposed in each of the expansion spaces remains consistent.

[0011] Beneficial effects: By reserving expansion space between adjacent pouch cells to fill with elastic buffers, this utility model can adaptively fill the space when the battery volume changes during charging and discharging. When the battery expands, it provides buffer protection between adjacent cells, and when the battery contracts, it provides space filling to ensure compactness. This improves the safety and compactness of the stacked assembly of pouch cells and ensures the safety of battery use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 for Figure 1 A magnified schematic diagram of a portion of region A in the middle;

[0014] Figure 3 This is a schematic diagram of the cross-sectional structure of an elastic buffer. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] like Figure 1 and Figure 2 As shown, a soft-cell battery pack for improving cell stacking safety includes a soft-cell battery module 2 assembled within a battery casing 1. The soft-cell battery module 2 is composed of multiple stacked soft-pack cells 3. An expansion space 4 is reserved between adjacent soft-pack cells 3, and this expansion space 4 is filled with an elastic buffer 5 that fits tightly against the soft-pack cells 3. When the soft-pack cells 3 expand or contract during charging and discharging, the elastic buffer 5 is correspondingly compressed or expands under its own elasticity, so that the elastic buffer 5 maintains its filling of the expansion space 4 and adapts to the volume change of the soft-pack cells 3. This invention, by reserving an expansion space 4 filled with an elastic buffer 5 between adjacent soft-pack cells 3, can adaptively fill the space when the battery volume changes during charging and discharging. It provides buffer protection between adjacent cells when the battery expands and provides space filling when the battery contracts, ensuring compactness, thereby improving the safety and compactness of the stacked assembly of the soft-pack cells 3 and ensuring battery safety.

[0017] It should be noted that during charging and discharging, the volume changes of the battery include changes in the thickness, length, and width of the pouch cell 3. The length and width changes can be categorized as lateral dimension changes, while the thickness change is more significant. To further ensure safety during battery volume changes, both thickness and lateral dimension changes must be adequately protected. Therefore, in this invention, as... Figure 2 As shown, the elastic buffer body 5 is provided with a connecting body 6 on its length side and width side, and the elastic buffer body 5 is connected to the side of the soft-pack battery cell 3 through the connecting body 6. When the soft-pack battery cell 3 expands or contracts, the elastic buffer body 5 changes its thickness and shape at the same time. Through the connecting body 6, the elastic buffer body 5 expands or contracts in the length and width directions, thereby realizing the adaptive lateral synchronous size change of the elastic buffer body 5 when the lateral size of the soft-pack battery cell 3 changes. This avoids the phenomenon of filling gaps near the edge of the soft-pack battery cell 3, which would lead to filling leaks in the elastic buffer coverage, and improves the comprehensiveness and reliability of the filling protection coverage.

[0018] In order to ensure that the elastic buffer 5 in the expansion space 4 can evenly accommodate the lateral dimensional changes of the two adjacent pouch cells 3, in this invention, the middle part of the connecting body 6 is connected to the side of the elastic buffer 5, and the two ends of the connecting body 6 are respectively connected to the two adjacent pouch cells 3.

[0019] In this invention, the connector 6 is a rigid and insulated connector plate structure.

[0020] like Figure 3 As shown, the elastic buffer 5 includes a silicone sheet 51, and both sides of the silicone sheet 51 are respectively covered with a heat-insulating structural layer 52. The silicone sheet 51 has good elasticity and insulation properties, and the heat-insulating structural layer 52 can provide heat insulation protection between adjacent soft-pack battery cells 3.

[0021] In the soft-cell battery module 2, the thickness of the elastic buffer 5 provided in each expansion space 4 is consistent, ensuring the uniformity of elastic filling, buffering and protection of the entire soft-cell battery module 2.

[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A soft-cell battery pack for improving the safety of cell stacking, comprising a soft-cell battery module (2) assembled in a battery casing (1), the soft-cell battery module (2) being assembled by stacking multiple soft-pack cells (3); Its features are: An expansion space (4) is reserved between adjacent soft-pack cells (3). The expansion space (4) is filled with an elastic buffer (5) that fits tightly against the soft-pack cells (3). When the soft-pack cells (3) expand or contract in the charging and discharging state, the elastic buffer (5) is compressed accordingly or expands under its own elasticity so that the elastic buffer (5) maintains the filling of the expansion space (4) and adapts to the volume change of the soft-pack cells (3).

2. The soft-cell battery pack for improving cell stacking safety according to claim 1, characterized in that: The elastic buffer (5) is provided with a connector (6) on its length side and width side respectively. The elastic buffer (5) is connected to the side of the soft-pack battery cell (3) through the connector (6). When the soft-pack battery cell (3) expands or contracts, the elastic buffer (5) changes its thickness and shape. At the same time, the elastic buffer (5) expands or contracts in the length and width directions through the connector (6).

3. A soft-cell battery pack for improving cell stacking safety according to claim 2, characterized in that: The middle part of the connector (6) is connected to the side of the elastic buffer (5), and the two ends of the connector (6) are respectively connected to two soft-pack cells (3) on the adjacent sides.

4. A soft-cell battery pack for improving cell stacking safety according to claim 2, characterized in that: The connector (6) is a rigid and insulated connector plate structure.

5. A soft-cell battery pack for improving cell stacking safety according to claim 2, characterized in that: The elastic buffer (5) includes a silicone sheet (51), and the two sides of the silicone sheet (51) are respectively covered with a heat insulation structure layer (52).

6. A soft-cell battery pack for improving cell stacking safety according to any one of claims 1 to 5, characterized in that: In the soft-cell battery module (2), the thickness of the elastic buffer (5) provided in each of the expansion spaces (4) remains consistent.

Images