Battery pack and vehicle

Abstract

The utility model provides a battery pack and a vehicle, and the battery pack comprises a battery cell which is provided with an anti-explosion valve; the chip is electrically connected with the battery cell; and the insulating protection piece covers the bar piece, so that the explosion-proof valve and the bar piece are separated from each other. According to the battery pack disclosed by the embodiment of the invention, the sheet is subjected to full-coating insulation protection through the insulation protection piece, so that the sheet is completely isolated from the explosion-proof valve of the battery cell, even if the battery cell is subjected to thermal runaway, a conductive substance sprayed out of the explosion-proof valve cannot be in contact with the sheet, the risk of insulation failure during thermal runaway of the battery pack is reduced as much as possible, and the service life of the battery pack is prolonged. The risk of short circuit during thermal runaway of the battery pack is reduced as much as possible, and the safety performance of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack and a vehicle. Background Technology

[0002] In recent years, with the rapid development of the new energy vehicle industry, the market demand for battery packs has been increasing. The reliability of battery packs directly affects the safety of the entire vehicle. Due to the long-term operation of cyclic charging and discharging and the relatively closed working environment, battery packs may experience thermal runaway. When thermal runaway occurs, a large amount of conductive materials, such as copper foil, aluminum foil, and graphite, will be ejected, which can easily cause short circuits inside the battery and cause huge safety risks.

[0003] The battery packs of related technologies use a spray method to mitigate the spread of thermal runaway, but the protective effect is limited. Some battery packs still experience short circuits during thermal runaway tests, which can lead to fires and explosions. Utility Model Content

[0004] The purpose of this application is to provide a battery pack and vehicle that minimizes the risk of insulation failure and short circuit during thermal runaway of the battery pack, thereby improving the safety performance of the battery pack.

[0005] To address the aforementioned technical problems, this application provides a battery pack, comprising:

[0006] The battery cell has an explosion-proof valve;

[0007] The battery pack is electrically connected to the battery cell.

[0008] An insulating protective element covers the valve plate to isolate the explosion-proof valve from the valve plate.

[0009] In this embodiment, the battery pack provides full insulation protection for the circuit breaker by using insulating protective components, thereby completely isolating the circuit breaker from the explosion-proof valve of the battery cell. Even if the battery cell experiences thermal runaway, the conductive material ejected from the explosion-proof valve will not come into contact with the circuit breaker, thus minimizing the risk of insulation failure and short circuit during thermal runaway of the battery pack, and improving the safety performance of the battery pack.

[0010] Optionally, the same insulating protective element can simultaneously cover each of the pads connected to two adjacent rows of battery cells.

[0011] Optionally, the minimum distance between the edge of the insulating protective member and the edge of the sheet covered by the insulating protective member is L1, and the value of L1 is in the range of: L1≥2mm.

[0012] Optionally, the battery includes a collection ear, and the two ends of the insulating protective member in the width direction have bent portions that first bend towards the direction of the battery cell and then bend towards both ends of the insulating protective member in the width direction, the bent portions covering the collection ear.

[0013] Optionally, the battery pack further includes:

[0014] A liquid cooling plate, wherein the liquid cooling plate and the plate are bonded together;

[0015] The insulating protective component covers the liquid cooling plate to isolate the explosion-proof valve from the liquid cooling plate.

[0016] Optionally, the battery pack further includes:

[0017] A cell shoulder brace connects two adjacent rows of cells;

[0018] The insulating protective component covers the shoulder strip of the battery cell to isolate the shoulder strip of the battery cell from the explosion-proof valve.

[0019] Optionally, the insulating protective member has a recessed portion that is recessed in a direction away from the shoulder pull strip of the battery cell, the shoulder pull strip portion being located inside the recessed portion, and the wall portion of the shoulder pull strip facing away from the battery cell being abutted against the end wall of the recessed portion.

[0020] Optionally, the insulating protective component is provided with a drain hole, which is located between the liquid cooling plates corresponding to two adjacent rows of battery cells.

[0021] Optionally, along the length of the insulating protective member, the insulating protective member is provided with a drain hole at a position corresponding to each of the liquid cooling plates.

[0022] Optionally, the battery pack further includes:

[0023] A bottom protective plate, wherein the bottom protective plate and the insulating protective component are disposed opposite to each other;

[0024] An isolator is installed between the insulating protective element and the bottom protective plate to isolate the drain hole and the explosion-proof valve, and the isolator is made of a hydrophobic material.

[0025] Optionally, the distance between the bottom protective plate and the insulating protective component is D1, and the thickness of the insulating component in its natural state is D2, where D2 ≥ D1.

[0026] This embodiment also provides a vehicle including the aforementioned battery pack.

[0027] The vehicle in this embodiment includes the aforementioned battery pack, and therefore has the same technical effects as the aforementioned battery pack, which will not be repeated here. Attached Figure Description

[0028] Figure 1 This is a breakdown diagram of a specific embodiment of the battery pack provided in this application;

[0029] Figure 2 for Figure 1 A schematic diagram of the battery cell structure in a battery pack;

[0030] Figure 3 for Figure 1 First sectional view of the battery pack;

[0031] Figure 4 for Figure 1 A schematic diagram of the insulating protective components in a battery pack;

[0032] Figure 5 for Figure 1 Schematic diagram of the insulating and insulating components in the battery pack;

[0033] Figure 6 for Figure 1 Second sectional view of the battery pack;

[0034] Figure 7 for Figure 1 Third sectional view of the battery pack;

[0035] in, Figures 1-7 The accompanying figure labels are as follows:

[0036] 1-Battery cell; 11-Explosion-proof valve;

[0037] 2-Bapi; 21-Collecting ear;

[0038] 3-Insulating protective component; 31-Recessed portion; 32-Bending portion; 3a-Drainage hole;

[0039] 4-Liquid cooling plate;

[0040] 5-Shoulder strip of battery cell;

[0041] 6- Bottom guard plate;

[0042] 7-Isolation component. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] In this article, the cells 1 arranged in a direction perpendicular to the large surface of cell 1 form a row.

[0045] Figure 6In the image, the arrow indicates the direction of coolant flow ejected from the ruptured hot plate 4.

[0046] Please refer to Figures 1-3 , Figure 1 This is a breakdown diagram of a specific embodiment of the battery pack provided in this application; Figure 2 for Figure 1 A schematic diagram of the battery cell structure in a battery pack; Figure 3 for Figure 1 First cross-sectional view of the battery pack.

[0047] This embodiment provides a battery pack, including:

[0048] Battery cell 1, battery cell 1 has an explosion-proof valve 11;

[0049] Bar plate 2 is electrically connected to battery cell 1;

[0050] Insulating protective element 3 covers the bar plate 2 to isolate the explosion-proof valve 11 and the bar plate 2.

[0051] In this embodiment, the battery pack provides full insulation protection for the plate 2 by using the insulating protective component 3, thereby completely isolating the plate 2 from the explosion-proof valve 11 of the cell 1. Even if the cell 1 experiences thermal runaway, the conductive material ejected from the explosion-proof valve 11 will not come into contact with the plate 2, thus minimizing the risk of insulation failure and short circuit during thermal runaway of the battery pack, and improving the safety performance of the battery pack.

[0052] Meanwhile, the insulating protective component 3 in the battery pack of this embodiment will not affect the existing spray structure. In other words, the battery pack can be equipped with the insulating protective component 3 on the basis of the existing spray structure. When the battery pack experiences thermal runaway, the spraying method can be used to mitigate the spread of thermal runaway, and the insulating protective component 3 can be used to block the transmission path between the conductive material and the bar plate 2, so as to avoid the conductive material sprayed by the explosion-proof valve 11 from contacting the bar plate 2 as much as possible. Through dual protection, the risk of short circuit during thermal runaway is reduced, and the safety performance of the battery pack is improved.

[0053] The insulating protective component 3 is preferably made of a high-temperature resistant material. In some embodiments of this application, the insulating protective component 3 is made of ceramic composite tape. Ceramic composite tape is a mature material composed of glass fiber and mica. It has excellent high-temperature resistance (temperature resistance ≥1000°C) and excellent durability, ensuring that the insulating protective component 3 can reliably perform its insulating protective function.

[0054] The battery pack 2 typically includes a sensor 21, on which a voltage sensor is placed to collect the voltage of the battery cell 1. The sensor 21 is also within the coverage area of ​​the insulating protective component 3, thereby achieving full coverage of the battery pack 2 by the insulating protective component 3.

[0055] Depend on Figure 3 It can be seen that the two ends of the insulating protective component 3 in the width direction have bending portions 32 that first bend towards the direction of the battery cell 1 and then bend towards the two ends of the width direction of the insulating protective component 3. The bending portions 32 cover the acquisition ear 21, ensuring that the insulating protective component 3 reliably covers the acquisition ear 21.

[0056] Please refer to Figures 3-4 , Figure 4 for Figure 1 A schematic diagram of the insulating protective components in a battery pack.

[0057] In this embodiment, the same insulating protective component 3 can simultaneously cover each piece 2 connected to two adjacent rows of battery cells 1.

[0058] As described above, the insulating protective component 3 adopts an integrated structure. On the one hand, it only requires one installation step to fully cover each of the pads 2 connected to the two adjacent rows of cells 1, making the assembly of the insulating protective component 3 simpler. On the other hand, if each of the pads 2 connected to the two adjacent rows of cells 1 is covered by multiple insulating protective components 3, there will inevitably be seams between adjacent insulating protective components 3. The seams may form protective gaps, leading to protection failure. However, since the insulating protective component 3 adopts an integrated structure, there are no seams, and therefore no protective gaps, resulting in better insulation protection. In addition, the integrated structure makes the insulating protective component 3 more structurally stable, and it can more reliably resist the impact of conductive substances ejected from the explosion-proof valve 11. As a result, the insulating protective component 3 can stably perform its insulation protection function for a long time, minimizing the contact between the conductive substances ejected from the explosion-proof valve 11 and the pads 2, reducing the risk of short circuits during battery pack thermal runaway, and improving the safety performance of the battery pack.

[0059] Furthermore, in this embodiment, the minimum distance between the edge of the insulating protective member 3 and the edge of the sheet 2 covered by the insulating protective member 3 is L1, and the value range of L1 is: L1≥2mm.

[0060] Specifically, the distance between the edge of the collecting ear 21 in the bar plate 2 and the edge of the insulating protective member 3 in the width direction is the smallest. Therefore, the edge of the insulating protective member 3 in the width direction extends beyond the edge of the collecting ear 21, and the distance of the extension is not less than 2mm. In the same row of cells 1, the distance between the edge of the bar plate 2 at both ends and the edge of the insulating protective member 3 in the length direction is the smallest. Therefore, the edge of the insulating protective member 3 in the length direction extends beyond the edge of the corresponding end bar plate 2, and the distance of the extension is not less than 2mm.

[0061] As set up above, the coverage area of ​​the insulating protective component 3 extends beyond the area where the valve plate 2 is located, ensuring that the valve plate 2 can be completely covered by the insulating protective component 3, thereby achieving complete isolation between the explosion-proof valve 11 and the valve plate 2.

[0062] Please continue to refer to this. Figure 3 In this embodiment, the battery pack further includes:

[0063] Liquid cooling plate 4, liquid cooling plate 4 and bar plate 2 are bonded together;

[0064] The insulating protective component 3 covers the liquid cooling plate 4 to isolate the explosion-proof valve 11 from the liquid cooling plate 4.

[0065] As set up above, the liquid cooling plate 4 cools the bar plate 2, and the insulating protective component 3 covers both the liquid cooling plate 4 and the bar plate 2. That is, the liquid cooling plate 4 and the bar plate 2 are located on the same side of the insulating protective component 3, so as to avoid the insulating protective component 3 interfering with the heat exchange between the liquid cooling plate 4 and the bar plate 2.

[0066] Depend on Figure 3 As can be seen, in this embodiment, the opposite sidewalls of the insulating protective component 3 and the liquid cooling plate 4 are attached and bonded together to fix the insulating protective component 3, thereby fixing the insulating protective component 3, ensuring the reliable installation position of the insulating protective component 3, and avoiding positional displacement of the insulating protective component 3 as much as possible, so that the insulating protective component 3 can stably play the role of insulating and protecting the bar plate 2.

[0067] Please refer to Figure 3 and Figure 5 , Figure 5 for Figure 1 A schematic diagram of the insulating and insulating components in the battery pack.

[0068] In this embodiment, the battery pack further includes:

[0069] The battery cell shoulder pull strip 5 connects the battery cells 1 in two adjacent rows;

[0070] The insulating protective component 3 covers the shoulder strip 5 of the battery cell to isolate the shoulder strip 5 of the battery cell from the explosion-proof valve 11.

[0071] As set up above, the battery cell shoulder strip 5 connects the battery cells 1 in two adjacent columns, which helps to improve the connection strength of the battery cells 1. When installing or removing the battery cells 1, the battery cells 1 connected by the same battery cell shoulder strip 5 can be installed or removed at the same time, improving the installation or removal efficiency of the battery cells 1. The insulating protective component 3 covers the battery cell shoulder strip 5, that is, the battery cell shoulder strip 5 and the battery cells 1 are located on the same side of the insulating protective component 3, so as to avoid the insulating protective component 3 interfering with the connection between the battery cell shoulder strip 5 and the battery cells 1.

[0072] like Figure 3 and Figure 5As shown, in this embodiment, the insulating protective member 3 has a recessed portion 31 that is recessed in the direction away from the shoulder pull strip 5 of the battery cell. The shoulder pull strip 5 is partially located inside the recessed portion 31, and the wall portion of the shoulder pull strip 5 facing away from the battery cell 1 is attached to the end wall of the recessed portion 31.

[0073] As described above, the insulating protective component 3 is designed to conform to the structure of the shoulder pull strip 5 of the battery cell, so that the wall of the shoulder pull strip 5 facing away from the battery cell 1 can fit together with the insulating protective component 3, which facilitates the fixing of the two and further improves the reliability of the installation position of the insulating protective component 3, and avoids the positional displacement of the insulating protective component 3 as much as possible, so that the insulating protective component 3 can stably play the role of insulating and protecting the battery cell 2.

[0074] In some embodiments of this application, the shoulder pull strip 5 of the battery cell is bonded and fixed to the wall of the battery cell 1 and the end wall of the recessed portion 31, and the connection is reliable.

[0075] Please refer to Figure 4 and Figure 6 , Figure 6 for Figure 1 Second sectional view of the battery pack.

[0076] In this embodiment, the insulating protective component 3 is provided with a drain hole 3a, which is located between the liquid cooling plates 4 corresponding to two adjacent rows of battery cells 1.

[0077] Since the liquid cooling plate 4 covered by the insulating protective component 3 is also at risk of rupture during thermal runaway, in order to ensure that the coolant sprayed from the liquid cooling plate 4 can be quickly discharged and to avoid the formation of a slow short circuit due to the long-term accumulation of coolant (the conductivity of the coolant is low and will not pose a risk in a short time), the insulating protective component 3 in this embodiment is provided with a drain hole 3a. The drain hole 3a is located between the liquid cooling plates 4 corresponding to two adjacent rows of cells 1, so that the coolant sprayed from the liquid cooling plate 4 can be quickly discharged from the drain hole 3a, ensuring that the coolant does not accumulate between two adjacent rows of cells 1 to form a large short circuit, thereby minimizing the short circuit risk of the cells 1 and reducing the short circuit risk of the battery pack.

[0078] Depend on Figure 4 As can be seen, in this embodiment, along the length of the insulating protective member 3, a drain hole 3a is provided at the position corresponding to each liquid cooling plate 4.

[0079] In this way, if any liquid cooling plate 4 breaks, the coolant sprayed out by the liquid cooling plate 4 can be quickly discharged from the corresponding drain hole 3a, shortening the flow path of the coolant and improving the drainage efficiency.

[0080] Depend on Figure 6It can be seen that the drain hole 3a is located between the cell shoulder pull strip 5 and the liquid cooling plate 4. The cell shoulder pull strip 5 can also hinder the flow of coolant, so that the coolant sprayed from the liquid cooling plate 4 can be quickly discharged from the drain hole 3a, reducing the risk of short circuit in the battery pack.

[0081] Please refer to Figure 7 , Figure 7 for Figure 1 Third sectional view of the battery pack.

[0082] In this embodiment, the battery pack further includes:

[0083] Bottom protective plate 6, which is arranged opposite to the insulating protective component 3;

[0084] Isolator 7 is installed between insulating protective element 3 and bottom protective plate 6 to isolate drain hole 3a and explosion-proof valve 11. Isolator 7 is made of hydrophobic material.

[0085] As set up above, the drain hole 3a and the explosion-proof valve 11 are separated by the isolation component 7, which can ensure that the conductive material sprayed from the explosion-proof valve 11 and the coolant sprayed from the cold plate below the explosion-proof valve 11 will not come into contact with the battery plate 2 through the drain hole 3a in the event of thermal runaway, thus ensuring the reliable protection of the insulating protective component 3 and reducing the risk of short circuit in the battery pack.

[0086] Meanwhile, the isolation component 7 is made of a hydrophobic material, which means that the isolation component 7 can effectively resist the penetration of water, ensuring that the isolation component 7 will not be wetted by the coolant and ensuring the isolation effect of the isolation component 7.

[0087] In this embodiment, the distance between the bottom protective plate 6 and the insulating protective component 3 is D1, and the thickness of the isolation component 7 in its natural state is D2, where D2 ≥ D1.

[0088] As set up above, when the isolator 7 is installed between the insulating protective component 3 and the bottom protective plate 6, the isolator 7 is in a compressed state, ensuring that the isolator 7 and the insulating protective component 3 fit tightly together, and ensuring that the isolator 7 and the bottom protective plate 6 fit tightly together, thereby improving the isolation effect of the isolator 7.

[0089] To ensure that the isolator 7 can undergo compressive deformation under pressure, in this embodiment, the compression ratio of the isolator 7 is α, and the value of α is in the range of α≥50%. In this way, the isolator 7 has good compressive deformation capability, which makes it easy to press the isolator 7 between the insulating protective component 3 and the bottom protective plate 6.

[0090] In some embodiments of this application, the insulating element 7 can be made of hydrophobic foam, such as glass wool, rock wool, polyurethane, etc. Hydrophobic foam has excellent waterproof performance, can effectively resist the penetration of water, and maintain the heat insulation effect of the material. At the same time, hydrophobic foam has a long service life, which can reduce material aging and performance degradation caused by water vapor penetration.

[0091] This embodiment also provides a vehicle including the aforementioned battery pack.

[0092] The vehicle in this embodiment includes the aforementioned battery pack, and therefore has the same technical effects as the aforementioned battery pack, which will not be described again here.

[0093] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A battery pack, characterized in that, include: Battery cell (1), wherein the battery cell (1) has an explosion-proof valve (11); The electrode (2) and the battery cell (1) are electrically connected; An insulating protective element (3) covers the bar sheet (2) to isolate the explosion-proof valve (11) and the bar sheet (2).

2. The battery pack according to claim 1, characterized in that, The same insulating protective element (3) can simultaneously cover each of the pads (2) connected to two adjacent rows of the battery cells (1).

3. The battery pack according to claim 1, characterized in that, The minimum distance between the edge of the insulating protective element (3) and the edge of the sheet (2) covered by the insulating protective element (3) is L1, and the value range of L1 is: L1≥2mm.

4. The battery pack according to claim 1, characterized in that, The pad (2) includes a collection ear (21), and the insulating protective member (3) has a bent portion (32) at both ends in the width direction, which is bent towards the direction close to the battery cell (1) and then bent towards both ends in the width direction of the insulating protective member (3), and the bent portion (32) covers the collection ear (21).

5. The battery pack according to claim 1, characterized in that, The battery pack also includes: Liquid cooling plate (4), the liquid cooling plate (4) and the bar sheet (2) are attached together; The insulating protective component (3) covers the liquid cooling plate (4) to isolate the explosion-proof valve (11) from the liquid cooling plate (4).

6. The battery pack according to claim 1, characterized in that, The battery pack also includes: A battery cell shoulder strap (5) connects two adjacent rows of battery cells (1). The insulating protective component (3) covers the shoulder strip (5) of the battery cell to isolate the shoulder strip (5) of the battery cell from the explosion-proof valve (11).

7. The battery pack according to claim 6, characterized in that, The insulating protective member (3) has a recessed portion (31) that is recessed in a direction away from the shoulder pull strip (5) of the battery cell. The shoulder pull strip (5) is partially located inside the recessed portion (31). The shoulder pull strip (5) is attached to the wall of the battery cell (1) and the end wall of the recessed portion (31).

8. The battery pack according to claim 5, characterized in that, The insulating protective component (3) is provided with a drain hole (3a), which is located between the liquid cooling plates (4) corresponding to the two adjacent columns of the battery cells (1).

9. The battery pack according to claim 8, characterized in that, Along the length of the insulating protective member (3), the insulating protective member (3) is provided with the drain hole (3a) at the position corresponding to each of the liquid cooling plates (4).

10. The battery pack according to claim 8, characterized in that, The battery pack also includes: Bottom protective plate (6), the bottom protective plate (6) and the insulating protective component (3) are arranged opposite to each other; An isolator (7) is installed between the insulating protective element (3) and the bottom protective plate (6) to separate the drain hole (3a) and the explosion-proof valve (11). The isolator (7) is made of a hydrophobic material.

11. The battery pack according to claim 10, characterized in that, The distance between the bottom protective plate (6) and the insulating protective component (3) is D1, and the thickness of the isolation component (7) in its natural state is D2, where D2 ≥ D1.

12. A vehicle, characterized in that, Includes the battery pack as described in any one of claims 1-11.

Images