A battery pack

Abstract

The utility model belongs to the technical field of energy storage system, specifically discloses a battery pack, the battery pack provided by the utility model, the gas in the battery module is discharged through the battery valve, and is discharged to the explosion -proof exhaust pipe, the explosion -proof valve opens, and the gas in the explosion -proof exhaust pipe is discharged to the external environment, plays the role of pressure -relief explosion -proof, and the gas in the battery module is directly discharged to the explosion -proof exhaust pipe through the battery valve, avoids the problem that the battery pack occurs secondary short circuit or other chain reaction because of the gas emission in the battery module to the shell, the shell is filled with sealed heat conduction spare, and the structure that is set in combination with explosion -proof ventilation component, under the premise of not influencing the pressure -relief explosion -proof of battery pack, effectively prevent the external humid air from entering the battery pack inside, solve the problem that the component is corroded, the life is shortened because of the condensed water in the battery pack, improve the security that the battery pack uses, besides, sealed heat conduction spare plays the role of heat dissipation.

Description

Technical Field

[0001] This utility model relates to the field of energy storage system technology, and in particular to a battery pack. Background Technology

[0002] Energy storage battery packs typically consist of a lower casing, a top cover, battery cells, and an explosion-proof valve. During battery pack use, changes in ambient temperature often cause pressure differences between the inside and outside of the pack. To prevent long-term pressure imbalance leading to seal failure, explosion-proof valves that are waterproof and breathable are usually chosen. Specifically, this is achieved by installing an EPTFE membrane on the explosion-proof valve, allowing it to breathe. However, external air, including moisture, can still enter the battery pack. With forced cooling within the pack and fluctuating external temperatures, condensation can easily form inside, posing a safety hazard. Current technology typically dehumidifies the environment surrounding the battery pack to prevent condensation. However, dehumidification often fails or is insufficient, making it impossible to guarantee that condensation will not occur inside the battery pack during the operating cycle. Utility Model Content

[0003] The purpose of this invention is to provide a battery pack that effectively prevents external humid air from entering the battery pack, solves the problem of corrosion and shortened lifespan of components caused by condensation inside the battery pack, and improves the safety of battery pack use.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A battery pack, comprising:

[0006] case;

[0007] A battery module is disposed within the housing, and the battery module has a battery opening valve;

[0008] An explosion-proof ventilation assembly includes an explosion-proof exhaust pipe and an explosion-proof valve. The explosion-proof exhaust pipe is disposed inside the housing, and the explosion-proof valve is connected to the housing and located outside the housing. The explosion-proof exhaust pipe is connected to the explosion-proof valve and the battery opening valve, respectively. Gas in the battery module flows into the explosion-proof exhaust pipe through the battery opening valve and is discharged through the explosion-proof valve. The housing is filled with a sealing heat-conducting body.

[0009] As an optional technical solution for the aforementioned battery pack, the housing includes a lower casing and an upper cover connected to the lower casing. The battery module is disposed in the lower casing, the battery opening valve is disposed on the side of the battery module away from the bottom of the lower casing, and the explosion-proof exhaust pipe is disposed on the side of the battery module away from the bottom of the lower casing.

[0010] As an optional technical solution for the aforementioned battery pack, the top cover is provided with an injection hole, which is configured to fill the housing with the sealing heat conductor through the injection hole.

[0011] As an optional technical solution for the aforementioned battery pack, multiple injection holes are provided, and the multiple injection holes are spaced apart along the circumferential edge of the top cover.

[0012] As an optional technical solution for the aforementioned battery pack, a first liquid cooling channel is provided on the outer side of the bottom of the lower housing. The inlet and outlet of the first liquid cooling channel are located on the outer side of the lower housing, and the first liquid cooling channel is used to place coolant to reduce the temperature inside the housing.

[0013] As an optional technical solution for the aforementioned battery pack, a second liquid cooling channel is provided on the top outer side of the top cover. The inlet and outlet of the second liquid cooling channel are located on the outer side of the top cover, and the second liquid cooling channel is used to place coolant to reduce the temperature inside the housing.

[0014] As an optional technical solution for the aforementioned battery pack, the top cover includes a top cover plate, and the circumferential edge of the top cover plate is connected to a side plate at an angle. Part of the battery module and the explosion-proof exhaust pipe are placed within the space enclosed by the top cover plate and the side plate.

[0015] As an optional technical solution for the aforementioned battery pack, a first connecting plate is provided at one end of the side panel away from the upper cover plate, the first connecting plate extending outward toward the side panel, a second connecting plate is provided at the edge of the opening of the lower housing, the second connecting plate extending outward toward the lower housing, the second connecting plate being connected to the first connecting plate, and a sealing element being provided between the second connecting plate and the first connecting plate.

[0016] As an optional technical solution for the aforementioned battery pack, the outer side of the casing is covered with an insulation layer.

[0017] As an optional technical solution for the aforementioned battery pack, the sealed thermal conductor is a sealed thermally conductive colloid.

[0018] Beneficial effects:

[0019] The battery pack provided by this utility model has an explosion-proof vent pipe connected to an explosion-proof valve and a battery opening valve. The explosion-proof valve is located on the outside of the housing. Gas inside the battery module is discharged through the battery opening valve and into the explosion-proof vent pipe. When the explosion-proof valve is opened, the gas in the explosion-proof vent pipe is discharged into the external environment, thus playing a role in pressure relief and explosion prevention. Gas inside the battery module is directly discharged into the explosion-proof vent pipe through the battery opening valve, avoiding the problem of secondary short circuits or other chain reactions caused by gas from the battery module being discharged into the housing. The housing is filled with a sealed heat-conducting component, and the structure combined with the explosion-proof ventilation component effectively prevents external humid air from entering the battery pack without affecting the pressure relief and explosion prevention of the battery pack. This solves the problem of corrosion and shortened lifespan of components caused by condensation inside the battery pack, improving the safety of battery pack use. In addition, the sealed heat-conducting component can also conduct the heat generated by the battery module during operation to the housing and dissipate heat through the housing, thus playing a role in heat dissipation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in this embodiment of the utility model;

[0021] Figure 2 yes Figure 1 The provided exploded view of the battery pack;

[0022] Figure 3 This is a schematic diagram of the structure of the battery module and explosion-proof ventilation assembly provided in this embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the internal structure of the battery pack provided in an embodiment of the present invention;

[0024] Figure 5 This is a first axial side view of the upper cover provided in an embodiment of the present utility model;

[0025] Figure 6 This is a structural schematic diagram of the lower housing provided in an embodiment of the present utility model;

[0026] Figure 7 This is a second axial side view of the upper cover provided in an embodiment of the present utility model;

[0027] Figure 8 This is a schematic diagram of the overall structure of the battery pack with a heat insulation layer covered by the shell provided in this embodiment of the utility model;

[0028] Figure 9 yes Figure 8 The provided exploded view of the battery pack.

[0029] In the picture:

[0030] 1. Housing; 2. Battery module; 3. Explosion-proof ventilation components; 4. Insulation layer;

[0031] 11. Lower housing; 111. Second connecting plate; 12. Top cover; 121. Top cover plate; 122. Side plate; 123. First connecting plate; 13. Injection hole; 14. First liquid cooling channel; 15. Second liquid cooling channel; 16. Seal;

[0032] 21. Battery valve opening; 22. Battery cell;

[0033] 31. Explosion-proof exhaust pipe; 311. Exhaust branch pipe; 312. Manifold; 32. Explosion-proof valve. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, the battery pack provided in this embodiment includes a housing 1, a battery module 2, and an explosion-proof venting assembly 3. The battery module 2 is disposed inside the housing 1 and has a battery opening valve 21. The explosion-proof venting assembly 3 includes an explosion-proof exhaust pipe 31 and an explosion-proof valve 32. The explosion-proof exhaust pipe 31 is disposed inside the housing 1, and the explosion-proof valve 32 is connected to the housing 1 and located outside the housing 1. The explosion-proof exhaust pipe 31 is connected to both the explosion-proof valve 32 and the battery opening valve 21. Gas inside the battery module 2 flows into the explosion-proof exhaust pipe 31 through the battery opening valve 21 and is discharged through the explosion-proof valve 32. The housing 1 is filled with a sealing heat-conducting body.

[0039] In this embodiment, the battery pack has an explosion-proof exhaust pipe 31 connected to an explosion-proof valve 32 and a battery opening valve 21. The explosion-proof valve 32 is located on the outside of the housing 1. Gas inside the battery module 2 is discharged through the battery opening valve 21 and into the explosion-proof exhaust pipe 31. When the explosion-proof valve 32 is opened, the gas inside the explosion-proof exhaust pipe 31 is discharged into the external environment, thus achieving the function of pressure relief and explosion prevention. Gas inside the battery module 2 is directly discharged into the explosion-proof exhaust pipe 31 through the battery opening valve 21, avoiding the problem of secondary short circuits or other chain reactions in the battery pack caused by the gas inside the battery module 2 being discharged into the housing 1. The housing 1 is filled with a sealed heat-conducting component, and combined with the structure of the explosion-proof ventilation component 3, it effectively prevents external humid air from entering the battery pack without affecting the pressure relief and explosion prevention of the battery pack. This solves the problem of corrosion and shortened lifespan of components caused by condensation inside the battery pack, improving the safety of the battery pack. In addition, the sealed heat-conducting component can also conduct the heat generated by the battery module 2 during operation to the housing 1 and dissipate heat through the housing 1, thus achieving the function of heat dissipation.

[0040] like Figure 3 and Figure 4As shown, in some embodiments, the housing 1 includes a lower casing 11 and an upper cover 12 connected to the lower casing 11. The battery module 2 is disposed inside the lower casing 11. The battery opening valve 21 is disposed on the side of the battery module 2 opposite to the bottom of the lower casing 11. The explosion-proof vent pipe 31 is disposed on the side of the battery module 2 opposite to the bottom of the lower casing 11. The explosion-proof vent pipe 31 is conveniently connected to the battery opening valve 21. In the actual assembly process, after connecting the battery opening valve 21 to the explosion-proof vent pipe 31, the explosion-proof vent pipe 31 is then glued to the surface of the battery module 2 with adhesive or the like to fix the explosion-proof vent pipe 31.

[0041] The battery module 2 has a steel strip binding structure. The battery module 2 includes multiple battery cells 22. Each battery cell 22 is equipped with a battery opening valve 21. The explosion-proof exhaust pipe 31 is equipped with a connection part for connecting to the battery opening valve 21. The structure of the connection part needs to be set according to the structure of the battery opening valve 21. It can be a connecting pipe, which is not specifically limited here.

[0042] The battery module 2 includes multiple battery cells 22, which can be arranged in multiple columns, and each column has multiple battery cells 22. The explosion-proof exhaust pipe 31 includes multiple exhaust branch pipes 311 and a collection pipe 312. Each column of battery cells 22 is respectively provided with an exhaust branch pipe 311, and the multiple exhaust branch pipes 311 are respectively connected to the collection pipe 312. The explosion-proof valve 32 is connected to the collection pipe 312.

[0043] Optionally, such as Figure 5 As shown, the upper cover 12 is provided with an injection hole 13. The injection hole 13 is configured to fill the housing 1 with a sealing heat conductor through the injection hole 13. After the battery module 2 and the explosion-proof exhaust pipe 31 are installed into the lower housing 11, the upper cover 12 is placed on the lower housing 11 and connected to the lower housing 11. Then, the sealing heat conductor is injected into the space enclosed by the upper cover 12 and the lower housing 11 through the injection hole 13, so that the empty space in the housing 1 is filled with the sealing heat conductor.

[0044] Multiple injection holes 13 are provided, and the multiple injection holes 13 are spaced apart along the circumferential edge of the upper cover 12 to ensure that the gap between the battery module 2 and the upper cover 12 or the lower housing 11 is filled with sealing heat conductor. When some injection holes 13 are used to inject sealing heat conductor into the housing 1, the remaining injection holes 13 are used to expel air from the housing 1 to ensure that the sealing heat conductor can be smoothly filled into the housing 1.

[0045] The aforementioned sealing heat conductor is a sealing heat conductor colloid. When the sealing heat conductor colloid is in a liquid state, it is injected into the housing 1. After cooling, the sealing heat conductor colloid inside the housing 1 solidifies, which plays the role of sealing and heat conduction, and also plays the role of fixing the battery module 2 inside the housing 1.

[0046] Alternatively, the battery module 2 can be fixed inside the housing 1 first, and then thermally conductive silicone rubber can be injected into the housing 1 to provide both heat conduction and sealing.

[0047] like Figure 6 As shown, in some embodiments, a first liquid cooling channel 14 is provided on the outer side of the bottom of the lower housing 11. The inlet and outlet of the first liquid cooling channel 14 are located on the outer side of the lower housing 11, and the first liquid cooling channel 14 is used to hold coolant to lower the temperature inside the housing 1. If the coolant in the first liquid cooling channel 14 leaks, it will not enter the housing 1, thus avoiding safety hazards inside the battery pack caused by leakage from the first liquid cooling channel 14.

[0048] Optionally, the lower housing 11 is formed by die casting to create the first liquid cooling channel 14, which reduces machining, improves production efficiency, and lowers the probability of leakage in the first liquid cooling channel 14. Alternatively, the lower housing 11 can be formed by stretching a metal material such as aluminum, and the channel plate with the first liquid cooling channel 14 can be welded to the bottom outer side of the lower housing 11.

[0049] The first liquid cooling channel 14 can be arranged in a U-shape or an S-shape at the bottom of the lower housing 11 to increase the heat dissipation area.

[0050] In addition, the circumferential sidewalls of the lower housing 11 can also play a role in heat dissipation. The heat inside the battery pack is conducted to the sidewalls of the lower housing 11 through the sealed heat-conducting components. The sidewalls of the lower housing 11 exchange heat with the external environment, thus achieving heat dissipation.

[0051] Alternatively, a first liquid cooling channel 14 can be provided on the outer side wall of the lower housing 11 to improve heat dissipation efficiency.

[0052] like Figure 7 As shown, in some embodiments, a second liquid cooling channel 15 is provided on the outer side of the top of the upper cover 12. The inlet and outlet of the second liquid cooling channel 15 are located on the outer side of the upper cover 12. The second liquid cooling channel 15 is used to hold coolant to lower the temperature inside the housing 1. If the coolant in the second liquid cooling channel 15 leaks, it will not enter the housing 1, thus avoiding the safety hazards inside the battery pack caused by leakage of the second liquid cooling channel 15. In conjunction with the first liquid cooling channel 14 on the lower housing 11, the heat dissipation efficiency of the battery pack is improved, which can effectively solve the problem of insufficient cooling capacity on one side in high-rate application scenarios.

[0053] Optionally, the top cover 12 is formed by die casting to create the second liquid cooling channel 15, which reduces machining, improves production efficiency, and lowers the probability of leakage in the second liquid cooling channel 15. Alternatively, a channel plate for the second liquid cooling channel 15 can be welded to the outer top of the top of the top cover 12.

[0054] The second liquid cooling channel 15 can be arranged in a U-shape or an S-shape on the outer top of the upper cover 12 to increase the heat dissipation area. Multiple injection holes 13 can be arranged around the area where the second liquid cooling channel 15 is set, without affecting the arrangement of the second liquid cooling channel 15.

[0055] In some embodiments, the upper cover 12 includes an upper cover plate 121, with a side plate 122 connected at an angle to the circumferential edge of the upper cover plate 121. A portion of the battery module 2 and the explosion-proof exhaust pipe 31 are disposed within the space enclosed by the upper cover plate 121 and the side plate 122. An explosion-proof valve 32 may be disposed on the side plate 122, and a second liquid cooling channel 15 and an injection hole 13 are disposed on the upper cover plate 121. A portion of the battery module 2 protrudes from the lower housing 11, facilitating the fixing of the battery module 2 to the lower housing 11. The structure of the upper cover 12 cooperates with the lower housing 11 to form a closed space for holding the battery module 2 and the explosion-proof exhaust pipe 31. Furthermore, heat within the battery pack is conducted to the side plate 122 through a sealed heat conductor, allowing the side plate 122 to exchange heat with the external environment, thus achieving heat dissipation. The side plate 122 plays a heat dissipation role. Alternatively, a second liquid cooling channel 15 may be provided on the outer side of the side plate 122 to improve heat dissipation efficiency.

[0056] like Figure 2 , Figure 6 and Figure 7 As shown, in some embodiments, a first connecting plate 123 is provided at the end of the side plate 122 away from the upper cover plate 121. The first connecting plate 123 extends outward toward the side plate 122. A second connecting plate 111 is provided at the edge of the opening of the lower box 11. The second connecting plate 111 extends outward toward the lower box 11. The second connecting plate 111 is connected to the first connecting plate 123 to facilitate the connection between the lower box 11 and the upper cover 12. A sealing element 16 is provided between the second connecting plate 111 and the first connecting plate 123 to ensure the sealing of the connection between the lower box 11 and the upper cover 12.

[0057] The seal 16 can be a ring-shaped rubber part, silicone part, or sealant, which provides a good sealing effect, and no specific limitation is made here.

[0058] The first connecting plate 123 and the second connecting plate 111 can be connected by bolts, which facilitates disassembly and installation.

[0059] like Figure 8 and Figure 9 As shown, in some embodiments, the outer side of the housing 1 is covered with a thermal insulation layer 4. If the battery pack operates in a low-temperature environment, the outer side of the housing 1 can be covered with a thermal insulation layer 4 to reduce the impact of external temperature on the inside of the battery pack and improve the energy efficiency of the battery pack. For the specific structure of the housing 1, thermal insulation layers 4 are respectively provided on the outer side wall of the lower housing 11 and the outer side wall of the upper cover 12.

[0060] The insulation layer 4 can be made of polyimide foam or aerogel, etc., which has low thermal conductivity, flame retardancy, and can effectively slow down heat loss.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery pack, characterized in that, include: Shell (1); A battery module (2) is disposed inside the housing (1), and the battery module (2) has a battery opening valve (21). The explosion-proof ventilation assembly (3) includes an explosion-proof exhaust pipe (31) and an explosion-proof valve (32). The explosion-proof exhaust pipe (31) is disposed inside the housing (1). The explosion-proof valve (32) is connected to the housing (1) and placed outside the housing (1). The explosion-proof exhaust pipe (31) is connected to the explosion-proof valve (32) and the battery opening valve (21) respectively. The gas in the battery module (2) flows into the explosion-proof exhaust pipe (31) through the battery opening valve (21) and is discharged through the explosion-proof valve (32). The housing (1) is filled with a sealing heat conductor.

2. The battery pack according to claim 1, characterized in that, The housing (1) includes a lower box (11) and an upper cover (12) connected to the lower box (11). The battery module (2) is disposed inside the lower box (11). The battery valve (21) is disposed on the side of the battery module (2) away from the bottom of the lower box (11). The explosion-proof exhaust pipe (31) is disposed on the side of the battery module (2) away from the bottom of the lower box (11).

3. The battery pack according to claim 2, characterized in that, The top cover (12) is provided with an injection hole (13), which is configured to fill the sealed heat conductor into the housing (1) through the injection hole (13).

4. The battery pack according to claim 3, characterized in that, The injection holes (13) are provided in multiple ways, and the multiple injection holes (13) are spaced apart along the circumferential edge of the upper cover (12).

5. The battery pack according to claim 2, characterized in that, The bottom of the lower housing (11) is provided with a first liquid cooling channel (14). The inlet and outlet of the first liquid cooling channel (14) are located on the outside of the lower housing (11). The first liquid cooling channel (14) is used to place coolant to reduce the temperature inside the housing (1).

6. The battery pack according to claim 2, characterized in that, The top outer side of the top cover (12) is provided with a second liquid cooling channel (15). The inlet and outlet of the second liquid cooling channel (15) are located on the outside of the top cover (12). The second liquid cooling channel (15) is used to place coolant to reduce the temperature inside the housing (1).

7. The battery pack according to claim 2, characterized in that, The upper cover (12) includes an upper cover plate (121), and the circumferential edge of the upper cover plate (121) is connected to a side plate (122) at an angle. Part of the battery module (2) and the explosion-proof exhaust pipe (31) are placed in the space enclosed by the upper cover plate (121) and the side plate (122).

8. The battery pack according to claim 7, characterized in that, The side plate (122) is provided with a first connecting plate (123) at one end away from the upper cover plate (121). The first connecting plate (123) extends outward toward the side plate (122). The edge of the opening of the lower box (11) is provided with a second connecting plate (111). The second connecting plate (111) extends outward toward the lower box (11). The second connecting plate (111) is connected to the first connecting plate (123), and a sealing element (16) is provided between the second connecting plate (111) and the first connecting plate (123).

9. The battery pack according to any one of claims 1-8, characterized in that, The outer side of the shell (1) is covered with a heat insulation layer (4).

10. The battery pack according to any one of claims 1-8, characterized in that, The sealed heat conductor is a sealed heat-conducting colloid.

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