Battery pack
By opening a through hole arranged opposite to the explosion-proof valve on the cold plate assembly of the battery pack, the problem of high-temperature gas emission blockage is solved and the safety performance of the battery pack is improved.
Patent Information
- Application Number
- CN202421758135.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-23
AI Technical Summary
The existing high-rate rechargeable battery packs are not compatible with safety performance, especially in the risk of blockage in high-temperature gas emissions, resulting in insufficient safety factor.
A through hole arranged opposite to the explosion-proof valve is opened on the cold plate assembly to ensure that the high-temperature gas can be discharged directly through the through holes, and prevent the cold plate assembly from hindering the high-temperature gas emitted by the explosion-proof valve.
The high-temperature gas discharged through the through holes avoids accumulation inside the battery pack, significantly improves the safety factor of the battery pack, and ensures higher safety performance.
Smart Images
Figure CN222914903U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery manufacturing, and particularly relates to a battery pack. Background Art
[0002] It is pointed out in the related art that with the development of new energy vehicles, the demand for battery packs with better safety performance and faster charging time is becoming more and more urgent. At present, the charging rate in the industry has been increased from 2C to 3C, and from 3C to 6C, truly achieving a charging time of 10 minutes and a cruising range of 600 km or more. Since the chemical properties of high-rate charging battery cells are relatively active, the overall safety protection of the battery pack needs to be improved, and the current high-rate charging solutions cannot be compatible with safety performance. Content of the Utility Model
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery pack, the structure of which is simple and the safety factor is high.
[0004] The battery pack according to the utility model includes: a housing, an accommodation cavity is formed inside the housing; a battery pack, the battery pack is arranged in the accommodation cavity, the battery pack includes a plurality of battery cells, the plurality of battery cells are arranged along the thickness direction of the battery cell, and an explosion-proof valve is arranged on the battery cell; a cold plate assembly, the cold plate assembly is formed with a through hole, and the through hole is arranged opposite to the explosion-proof valve.
[0005] For the battery pack according to the utility model, by providing a through hole on the cold plate assembly that is arranged opposite to the explosion-proof valve, while cooling the inside of the battery pack, it is avoided that the cold plate assembly blocks the high-temperature gas ejected by the explosion-proof valve, and the high-temperature gas can directly pass through the through hole and be discharged, avoiding accumulation inside the battery pack and improving the safety factor of the battery pack.
[0006] In some embodiments, explosion-proof valves are arranged on both opposite sides of the battery cell, the cold plate assembly includes a first cold plate and a second cold plate, the first cold plate is arranged on one surface of the battery cell where the explosion-proof valve is arranged, and the second cold plate is arranged on the other surface of the battery cell where the explosion-proof valve is arranged.
[0007] In some embodiments, there are a plurality of battery packs, each of the plurality of battery packs includes a plurality of battery cells, a plurality of through holes are formed on both the first cold plate and the second cold plate, and the plurality of through holes are arranged in one-to-one correspondence with the plurality of explosion-proof valves.
[0008] In some embodiments, cooling channels are formed on both sides in the length direction of the through hole, and the cooling channels extend along the arrangement direction of the battery cells.
[0009] In some embodiments, the cooling channel includes a first channel and a second channel, the second channel is arranged on both sides of the first channel, a liquid inlet is formed at one end of the first channel, a liquid outlet is formed at one end of the second channel, the liquid inlet and the liquid outlet are arranged on the same side, and the other end of the first channel is connected to the other end of the second channel.
[0010] In some embodiments, the housing includes a first plate and a second plate, the first plate is located on a side of the first cold plate away from the battery pack, the second plate is located on a side of the second cold plate away from the battery pack, a first exhaust cavity is formed between the first plate and the first cold plate, and a second exhaust cavity is formed between the second plate and the second cold plate.
[0011] In some embodiments, the through holes of the first cold plate are all in communication with the first exhaust cavity, and the through holes of the second cold plate are all in communication with the second exhaust cavity.
[0012] In some embodiments, the housing further includes a side beam, the side beam is arranged around the plurality of battery packs, and the first plate and the second plate are both connected to the side beam.
[0013] In some embodiments, the battery pack further includes: a first seal and a second seal, wherein the first seal is disposed between the first plate and the side beam, and the second seal is disposed between the second plate and the side beam.
[0014] In some embodiments, a pressure relief valve is provided on the side beam, and when the pressure relief valve is configured to be in an open state, the atmosphere is connected to at least one of the first exhaust chamber and the second exhaust chamber through the pressure relief valve.
[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the utility model;
[0017] Figure 2 yes Figure 1 An exploded diagram of a battery pack shown in FIG.
[0018] Figure 3 yes Figure 2 A schematic diagram of a battery pack shown in;
[0019] Figure 4 yes Figure 3 A schematic diagram of another perspective of the battery pack shown in ;
[0020] Figure 5 is Figure 3 a schematic view of another perspective of the battery pack shown in
[0021] Figure 6 is Figure 3 a schematic view of the battery cell shown in
[0022] Figure 7 is Figure 2 a schematic view of the assembly of the cold plate assembly and the battery pack shown in
[0023] Figure 8 is Figure 2 a schematic view of another perspective of the assembly of the cold plate assembly and the battery pack shown in
[0024] Figure 9 is Figure 2 a schematic view of another perspective of the assembly of the cold plate assembly and the battery pack shown in
[0025] Figure 10 is Figure 7 a schematic view of the first cold plate shown in
[0026] Figure 11 is Figure 10 a schematic view of another perspective of the first cold plate shown in
[0027] Figure 12 is Figure 2 a schematic view of the assembly of the battery pack shown in
[0028] Figure 13 is Figure 12 a schematic view of another perspective of the assembly of the battery pack shown in
[0029] Figure 14 is Figure 12 a schematic view of another perspective of the assembly of the battery pack shown in
[0030] Figure 15 is Figure 12 a schematic view of the further assembly of the battery pack shown in
[0031] Figure 16 is Figure 15 a schematic view of another perspective of the further assembly of the battery pack shown in
[0032] Figure 17 is Figure 15 a schematic view of another perspective of the further assembly of the battery pack shown in
[0033] Reference numerals:
[0034] 100, Battery pack; 1, Housing; 11, First plate; 12, Second plate; 13, First exhaust cavity; 14, Second exhaust cavity; 15, Side beam; 2, Battery pack; 21, Battery cell; 211, Explosion-proof valve; 3, Cold plate assembly; 31, First cold plate; 32, Second cold plate; 33, Through hole; 34, Cooling channel; 341, First channel; 342, Second channel; 4, First seal; 5, Second seal; 6, Pressure relief valve; 7, Partition block. Detailed implementation manners
[0035] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.
[0036] Below, reference is made to Figures 1 - 17 Describe the battery pack 100 according to the embodiment of the first aspect of the present utility model.
[0037] As Figures 1 - 17 shown, the battery pack 100 according to the embodiment of the first aspect of the present utility model includes: a housing 1, a battery pack 2, and a cold plate assembly 3.
[0038] Specifically, an accommodation cavity is formed inside the housing 1. The battery pack 2 is disposed in the accommodation cavity. The battery pack 2 includes a plurality of battery cells 21. The plurality of battery cells 21 are arranged along the thickness direction of the battery cell 21. An explosion-proof valve 211 is provided on the battery cell 21. The cold plate assembly 3 is formed with a through hole 33, and the through hole 33 is disposed opposite to the explosion-proof valve 211. Thus, the structure of the battery pack 100 is simple and ingeniously designed, ensuring the overall safety of the battery pack 100.
[0039] For the battery pack 100 according to the embodiment of the present utility model, by providing a through hole 33 on the cold plate assembly 3 that is disposed opposite to the explosion-proof valve 211, while cooling the inside of the battery pack 100, it is avoided that the cold plate assembly 3 obstructs the high-temperature gas ejected by the explosion-proof valve 211. The high-temperature gas can directly pass through the through hole 33 and be discharged, avoiding accumulation inside the battery pack 100 and improving the safety factor of the battery pack 100.
[0040] In some embodiments of the present utility model, explosion-proof valves 211 are provided on both opposite sides of the battery cell 21, improving the safety factor of the battery cell 21 and enabling the high-temperature gas to be discharged at a faster speed. Moreover, even if one of the explosion-proof valves 211 fails, the other can still play an explosion-proof role, as Figure 2As shown in the figure, the cold plate assembly 3 includes a first cold plate 31 and a second cold plate 32. The first cold plate 31 is disposed on one side surface of the battery cell 21 where the explosion-proof valve 211 is provided, and the second cold plate 32 is disposed on the other side surface of the battery cell 21 where the explosion-proof valve 211 is provided. The setting of the first cold plate 31 and the second cold plate 32 increases the heat exchange area, helps to distribute heat more evenly, improves the cooling efficiency. Moreover, the through hole 33 is aligned with the explosion-proof valve 211 to ensure that in an emergency, after the explosion-proof valve 211 is opened, any released substances can be directly discharged through the through hole 33, avoiding accumulation inside the battery pack 100, reducing the impact on other battery units, and preventing the spread of thermal runaway at the same time.
[0041] Among them, the structures of the first cold plate 31 and the second cold plate 32 are the same.
[0042] In some embodiments of the present invention, as Figure 3 shown, the battery pack 2 includes multiple battery cells. Each of the multiple battery packs 2 includes multiple battery cells 21. A plurality of through holes 33 are formed on both the first cold plate 31 and the second cold plate 32, and the plurality of through holes 33 are arranged in one-to-one correspondence with the plurality of explosion-proof valves 211. Thus, when the explosion-proof valve 211 of any one battery cell 21 is opened, the generated gas or liquid can be directly discharged through the corresponding through hole 33, avoiding accumulation inside the battery pack 100, reducing the impact on the surrounding battery cells 21, and preventing the spread of potential thermal runaway at the same time.
[0043] In some embodiments of the present invention, as Figures 7 - 10 shown, cooling channels 34 are formed on both sides in the length direction of the through hole 33, and the cooling channels 34 extend along the arrangement direction of the battery cells 21. That is to say, the cooling channels 34 are arranged adjacent to the position where the explosion-proof valve 211 is located. Even if the explosion-proof valve 211 is activated, the cooling medium can immediately cool the affected area, thereby quickly reducing the temperature and reducing the risk of thermal runaway. Moreover, the heat exchange efficiency and heat exchange effect of the cold plate assembly 3 are ensured.
[0044] In some embodiments of the present invention, as Figure 10 shown, the cooling channel 34 includes a first channel 341 and a second channel 342. The second channel 342 is arranged on both sides of the first channel 341. An inlet is formed at one end of the first channel 341, and an outlet is formed at one end of the second channel 342. The inlet and the outlet are arranged on the same side. The other end of the first channel 341 is communicated with the other end of the second channel 342. Thus, not only can the temperature of the battery pack 100 be effectively controlled, but also it has high design flexibility and maintenance convenience. By reasonably arranging and precisely controlling the fluid flow rate, uniform cooling of each battery cell 21 in the battery pack 100 is achieved.
[0045] In some embodiments of the present invention, as Figure 2As shown, the housing 1 includes a first plate 11 and a second plate 12, the first plate 11 is located on the side of the first cold plate 31 away from the battery pack 2, the second plate 12 is located on the side of the second cold plate 32 away from the battery pack 2, a first exhaust cavity 13 is formed between the first plate 11 and the first cold plate 31, and a second exhaust cavity 14 is formed between the second plate 12 and the second cold plate 32. Therefore, the first exhaust cavity 13 and the second exhaust cavity 14 help to discharge gas in an emergency, and can also serve as a buffer space to absorb the pressure generated when the battery expands, further improving the safety of the battery pack 100, and ensuring that the battery pack 100 can still maintain good performance and safety under extreme conditions.
[0046] In some embodiments of the present invention, the through holes 33 of the first cold plate 31 are all connected to the first exhaust chamber 13, and the through holes 33 of the second cold plate 32 are all connected to the second exhaust chamber 14. Specifically, when the explosion-proof valve 211 on the battery cell 21 is opened due to excessive internal pressure, gas or steam will be released from the explosion-proof valve 211. If these substances cannot be discharged quickly, pressure may be formed inside the battery pack 100, causing a secondary accident, ensuring that the safety of the battery pack 100 can be guaranteed to the greatest extent even in the event of a failure of the battery cell 21.
[0047] In some embodiments of the present invention, the housing 1 further includes a side beam 15, which is arranged around the plurality of battery packs 2, and the first plate 11 and the second plate 12 are both connected to the side beam 15. Thus, the structural strength of the battery pack 100 is improved, the stability and safety of the entire battery pack 100 are enhanced, the internal components are protected from external impact or pressure, and the connection structure is simple and easy to assemble.
[0048] In some embodiments of the present invention, Figure 2 As shown, the battery pack 100 also includes: a first seal 4 and a second seal 5. The first seal 4 is arranged between the first plate 11 and the side beam 15, and the second seal 5 is arranged between the second plate 12 and the side beam 15 to prevent water, dust, moisture and other external contaminants from entering the battery pack 100, maintain the sealing of the battery pack 100, and ensure the long-term stability and safety of the battery pack 100.
[0049] In some embodiments of the present invention, Figure 2 As shown, a pressure relief valve 6 is provided on the side beam 15. When the pressure relief valve 6 is in an open state, the atmosphere is connected to at least one of the first exhaust chamber 13 and the second exhaust chamber 14 through the pressure relief valve 6. That is, under normal circumstances, the pressure relief valve 6 is in a closed state to maintain the sealing and waterproof and dustproof functions of the battery pack 100. However, when the internal pressure rises to a dangerous level, the pressure relief valve 6 will open, allowing the gas to be discharged directly into the atmosphere through the pressure relief valve 6, thereby reducing the internal pressure of the battery pack 100.
[0050] Furthermore, the battery cell 21 is adhesively connected to the first cold plate 31 and the second cold plate 32 through structural adhesive.
[0051] As Figure 16 shown, partition blocks 7 are provided along the periphery of the first cold plate 31, and the partition blocks 7 are located between the first cold plate 31 and the first plate 11. Partition blocks 7 are provided along the periphery of the second cold plate 32, and the partition blocks 7 are located between the second cold plate 32 and the second plate 12.
[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.
[0053] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.
[0054] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0055] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0056] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.
Claims
1. A battery pack, characterized in that: include: A housing having a receiving cavity formed therein; A battery pack, the battery pack is arranged in the accommodating cavity, the battery pack comprises a plurality of battery cells, the plurality of battery cells are arranged along the thickness direction of the battery cells, and the battery cells are provided with explosion-proof valves; A cold plate assembly is formed with a through hole, and the through hole is arranged opposite to the explosion-proof valve.
2. The battery pack according to claim 1, characterized in that: The battery cell is provided with explosion-proof valves on opposite sides. The cold plate assembly includes a first cold plate and a second cold plate. The first cold plate is provided on one side of the battery cell provided with the explosion-proof valve, and the second cold plate is provided on the other side of the battery cell provided with the explosion-proof valve.
3. The battery pack according to claim 2, characterized in that: The battery packs include a plurality of battery packs, each of which includes a plurality of battery cells. The first cold plate and the second cold plate are each formed with a plurality of through holes, and the plurality of through holes are arranged in one-to-one correspondence with the plurality of explosion-proof valves.
4. The battery pack according to claim 3, characterized in that: Cooling channels are formed on both sides of the through hole in the length direction, and the cooling channels extend along the arrangement direction of the battery cells.
5. The battery pack according to claim 4, characterized in that: The cooling channel includes a first channel and a second channel, the second channel is arranged on both sides of the first channel, a liquid inlet is formed at one end of the first channel, a liquid outlet is formed at one end of the second channel, the liquid inlet and the liquid outlet are arranged on the same side, and the other end of the first channel is connected to the other end of the second channel.
6. The battery pack according to claim 5, characterized in that: The housing includes a first plate and a second plate, the first plate is located on a side of the first cold plate away from the battery pack, the second plate is located on a side of the second cold plate away from the battery pack, a first exhaust cavity is formed between the first plate and the first cold plate, and a second exhaust cavity is formed between the second plate and the second cold plate.
7. The battery pack according to claim 6, characterized in that: The through holes of the first cold plate are all communicated with the first exhaust cavity, and the through holes of the second cold plate are all communicated with the second exhaust cavity.
8. The battery pack according to claim 7, characterized in that: The housing further comprises a side beam, the side beam is arranged around the plurality of battery packs, and the first plate and the second plate are both connected to the side beam.
9. The battery pack according to claim 8, characterized in that: Also includes: A first sealing member and a second sealing member, wherein the first sealing member is disposed between the first plate and the side beam, and the second sealing member is disposed between the second plate and the side beam.
10. The battery pack according to claim 8, characterized in that: The side beam is provided with a pressure relief valve, and when the pressure relief valve is in an open state, the atmosphere is connected to at least one of the first exhaust chamber and the second exhaust chamber through the pressure relief valve.