Thermoelectric separation battery pack and automobile

Abstract

The invention discloses a battery pack and an automobile, the battery pack comprises a frame, a cell assembly, a circuit assembly and a flue plate, a tab of a cell and a second explosion-proof valve are arranged on different sides of the cell, the influence of thermal runaway airflow on the tab and related connection parts is reduced during thermal runaway, and the reliability of the battery pack is improved. The flue plate is provided with a plurality of groove sections arranged on the lower portion of the second anti-explosion valve to form a plurality of first channels, and a limiting plate is fixedly arranged between the baffle piece and the first edge beam piece to define a plurality of second channels communicated with the first channels. The system is used for guiding high-temperature smoke generated during thermal runaway to be collected to one side far away from a control cabin and then released, an exhaust path is prolonged, the smoke temperature of an anti-explosion valve area is reduced, it is ensured that a battery pack only smokes and does not catch fire during thermal runaway, thermoelectric separation management is more stably carried out, and heat and gas generated during thermal runaway are stably controlled and guided; therefore, the damage to the whole battery pack is reduced, and the safety and reliability of the power battery are improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery pack and a vehicle with thermal and electrical separation. Background Art

[0002] With the development of vehicles, electric vehicles are becoming more and more popular among users. As the main driving force of electric vehicles, the performance of power batteries will affect the overall performance of the vehicle. With the improvement of power battery performance, power batteries are developing towards high-rate and high-current charging.

[0003] Battery thermal runaway refers to a self-sustaining process in which the heat generated by chemical reactions or other reasons inside the battery cannot be effectively dissipated, resulting in a sharp increase in temperature and pressure. Once this state occurs, it is often difficult to control and may cause battery damage, fire or even explosion.

[0004] Thermal runaway is a complex process involving the interaction of multiple factors. At present, the control methods for battery thermal runaway still have the problem that the thermal runaway airflow spreads from the battery pack to the control system area, causing the overall thermal management electronic control components of the battery pack to fail, resulting in low safety and reliability of the battery. Summary of the invention

[0005] In view of the defects existing in the prior art, the present application provides a battery pack and a vehicle with thermal and electrical separation to solve the problem in the prior art that unrestrained thermal runaway airflow affects both the battery cells and the electronic control components.

[0006] The above-mentioned purpose of the present application is mainly achieved through the following technical solutions:

[0007] A battery pack with thermal and electrical separation, the battery pack comprising:

[0008] A frame is provided with a control cabin and a battery cabin, the frame includes a first side beam, a first space and a second space are partitioned inside the first side beam, and a first explosion-proof valve connected to the first space is arranged on the first side beam;

[0009] A battery cell assembly is arranged in the battery compartment of the frame, the battery cell assembly includes a plurality of battery cells and a baffle member clamped at the end of the battery cell, a second explosion-proof valve is arranged at the bottom of the battery cell, and the tab of the battery cell and the second explosion-proof valve are arranged on different sides of the battery cell;

[0010] A circuit assembly is disposed in a control compartment of the frame and is electrically connected to the battery cell;

[0011] A flue plate, fixedly mounted on one side of the frame and used to support the bottom of the battery cell, wherein the flue plate is provided with a plurality of groove sections respectively corresponding to the positions of the second explosion-proof valves, and a plurality of first channels are formed between the plurality of groove sections and the corresponding battery cells;

[0012] Among them, the baffle member close to the first side beam member is arranged at an interval with the first side beam member and is connected to the flue plate, and a limiting plate is fixedly provided between the baffle member and the first side beam member, so that the baffle member, the limiting plate, the first side beam member and the flue plate are combined to form a second channel connected to multiple first channels, and the first side beam member is provided with a connecting hole connecting the first space and the second channel.

[0013] In an optional embodiment, a plurality of partition plates are fixedly provided on the flue plate, and the plurality of partition plates are arranged between the groove section and the battery cells, and the thermal runaway airflow ejected from the battery cells can break through the partition plates and enter the first channel.

[0014] In an optional embodiment, the melting point of the separator plate is greater than the temperature of the thermal runaway gas flow.

[0015] In an optional embodiment, a guide area is provided on the partition plate, and the strength of the guide area is lower than the strength of other areas of the partition plate so as to be broken by the impact of the thermal runaway airflow.

[0016] In an optional embodiment, the baffle member arranged on a side of the battery cell away from the side beam member is sealed to the groove segment to seal an end of the first channel away from the second channel.

[0017] In an optional embodiment, a thermal runaway sensor electrically connected to the circuit assembly is provided in the control cabin.

[0018] In an optional embodiment, the frame includes a second side beam member fixedly connected to the first side beam member, a third channel is provided in the second side beam member, one end of the third channel is connected to the second channel, and a detection hole is opened on the second side beam member, and the detection end of the thermal runaway sensor extends into the detection hole.

[0019] In an optional embodiment, the third channel passes through one or more cavities in the second side beam member to connect the third channel with the detection hole.

[0020] In an optional embodiment, the wall thickness of each groove segment is greater than the wall thickness at other positions of the flue plate.

[0021] Based on the same inventive concept, the present application also provides a car, which includes the battery pack as described above.

[0022] Compared with the prior art, the advantages of this application are:

[0023] The battery pack with thermoelectric separation in the present application includes a frame, a battery cell assembly, a circuit assembly and a flue plate. The frame is provided with a control cabin and a battery cabin. The frame includes a first side beam. The first side beam is partitioned with a first space and a second space. The first side beam is provided with a first explosion-proof valve connected to the first space. The first space guides and discharges the thermal runaway airflow. The second space provides an installation space for connectors (such as high-voltage connectors, low-voltage connectors, etc.) on the battery pack, thereby achieving thermoelectric separation to a certain extent. The battery cell assembly is arranged in the battery compartment of the frame. The battery cell assembly includes a plurality of battery cells and a baffle member clamped at the end of the battery cell. A second explosion-proof valve is provided at the bottom of the battery cell. The pole ear of the battery cell and the second explosion-proof valve are arranged on different sides of the battery cell. Since the pole ear of the battery cell and the second explosion-proof valve are arranged on different sides of the battery cell, the influence of the thermal runaway airflow on the pole ear and related connection parts is reduced during thermal runaway, thereby achieving thermoelectric separation of the battery cell. The circuit assembly is arranged in the control cabin of the frame and is electrically connected to the battery cell.

[0024] A flue plate is fixedly arranged on one side of the frame and is used to support the bottom of the battery cell. A plurality of groove sections corresponding to the positions of the second explosion-proof valves are arranged on the flue plate. A plurality of first channels are formed between the plurality of groove sections and the corresponding battery cells as exhaust paths for high-temperature flue gas when the battery cell thermally runs away. The thermal runaway airflow only flows in the bottom space of the battery cell and will not enter the control cabin and the battery cabin, thereby realizing thermal and electrical separation of the battery pack.

[0025] The baffle member close to the first side beam member is arranged at an interval with the first side beam member and is connected to the flue plate. A limiting plate is fixedly provided between the baffle member and the first side beam member so that the baffle member, the limiting plate, the first side beam member and the flue plate are combined to form a second channel connected to multiple first channels. The first side beam member is provided with a connecting hole connecting the first space and the second channel.

[0026] The second channel is connected to the first channel, and is used to guide the high-temperature flue gas generated during thermal runaway to gather to the side away from the control cabin and release it, ensuring the smooth exhaust at the bottom of the battery cell, extending the exhaust path, reducing the flue gas temperature in the explosion-proof valve area, ensuring that the battery pack only smokes but does not catch fire during thermal runaway, and more stably performing thermoelectric separation management, stably controlling and guiding the heat and gas generated during thermal runaway to reduce damage to the battery pack as a whole, thereby improving the safety and reliability of the power battery. At the same time, by setting up the second channel to collect the thermal runaway airflow in each first channel, compared with the prior art of directly introducing the thermal runaway airflow into the cavity of the battery pack frame, the second channel will not affect the installation of electrical devices on the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of the flue plate provided in the embodiment of the present application;

[0030] Figure 3 A partial cross-sectional view of a first channel provided in an embodiment of the present application;

[0031] Figure 4 A partial cross-sectional view of a second channel provided in an embodiment of the present application;

[0032] Figure 5 A partial cross-sectional view of the third channel provided in an embodiment of the present application;

[0033] Figure 6 A partial schematic diagram of the first side beam member provided in an embodiment of the present application;

[0034] In the figure: 101, control cabin; 102, battery cabin; 103, first side beam member; 104, second side beam member; 105, first space; 106, second space; 107, first explosion-proof valve; 201, battery cell; 202, baffle member; 203, limiting plate; 300, circuit assembly; 400, flue plate; 401, groove section; 402, first channel; 403, second channel; 404, connecting hole; 500, partition plate; 601, thermal runaway sensor; 602, third channel; 603, detection hole; 700, bottom guard plate; 701, first support unit; 702, buffer protection member; 703, second support unit. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. The specific structures and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.

[0036] like Figure 1 As shown, Figure 1A schematic diagram of the structure of a battery pack provided in an embodiment of the present application, a thermally and electrically separated battery pack, the battery pack comprising a frame, a battery cell 201 assembly, a circuit assembly 300 and a flue plate 400, wherein:

[0037] like Figure 1 , Figure 6 As shown, Figure 6 A partial schematic diagram of the first side beam 103 provided in an embodiment of the present application, wherein a control cabin 101 and a battery cabin 102 are provided in the frame, and the frame includes a first side beam 103, wherein a first space 105 and a second space 106 are partitioned in the first side beam 103, and a first explosion-proof valve 107 connected to the first space 105 is arranged on the first side beam 103.

[0038] The frame of the battery pack is its core supporting structure, which is arranged with a control cabin 101 and a battery cabin 102. The control cabin 101 is used to house the circuit assembly 300, while the battery cabin 102 is used to house the battery cell 201 assembly. This partition arrangement helps to achieve a clear division of functional areas inside the battery pack, and is also convenient for management and maintenance. While providing a stable installation foundation for the battery cell 201 assembly and the circuit assembly 300, it also prevents thermal runaway in the battery cabin 102 where the battery cell 201 assembly is located from directly and quickly spreading to the control cabin 101, thereby delaying or even directly cutting off the failure conditions caused by the spread of thermal runaway in the circuit assembly 300.

[0039] like Figure 1 As shown, the first side beam 103 of the frame is one of the side support structures of the battery pack. The interior of the first side beam 103 is arranged into two independent spaces, a first space 105 and a second space 106. It is used to isolate different functional areas or provide additional protection in the event of thermal runaway. The first space 105 is connected to the outside world through the first explosion-proof valve 107, which helps to release pressure in the event of thermal runaway and prevent excessive pressure inside the battery pack. The second space 106, as a space separated from the thermal runaway airflow, can utilize the independent area where the second space 106 on the first side beam 103 is located to arrange related electronic control components. Through the stable isolation of the first space 105 and the second space 106, the first side beam 103 is further utilized for component arrangement, and is not affected by the discharge of the thermal runaway airflow, so it has stronger applicability and higher stability.

[0040] like Figure 1 As shown, the battery cell 201 assembly is arranged in the battery compartment 102 of the frame, and the battery cell 201 assembly includes a plurality of battery cells 201 and a baffle member 202 clamped at the end of the battery cell 201, a second explosion-proof valve is provided at the bottom of the battery cell 201, and the pole ear of the battery cell 201 and the second explosion-proof valve are arranged on different sides of the battery cell 201.

[0041] like Figure 1 As shown, the battery cell 201 assembly is the energy storage unit of the battery pack. A number of battery cells 201 are arranged according to the actual vehicle model, and these battery cells 201 are placed in the battery compartment 102. Multiple battery cells 201 are clamped by relatively arranged baffle members 202, which not only provides structural support, but also may help the thermal management of the battery cells 201. A second explosion-proof valve is provided at the bottom of the battery cell 201, so that each battery cell 201 can release pressure separately in the event of thermal runaway. The pole ear (the connecting part of the positive and negative poles) of the battery cell 201 and the second explosion-proof valve are arranged on different sides of the battery cell 201, and the distance between the pole ear and the second explosion-proof valve is extended as much as possible to avoid the thermal runaway airflow ejected by the second explosion-proof valve from impacting the pole ear, further reducing the risk of electrical short circuit in the event of thermal runaway.

[0042] like Figure 1 As shown, the circuit assembly 300 is disposed in the control cabin 101 of the frame and is electrically connected to the battery cell 201. The circuit assembly 300 is responsible for the power management and control of the battery pack. The circuit assembly 300 includes at least a BMS (battery management system) and a BDU (battery pack distribution unit).

[0043] like Figure 1 , Figure 2 as well as Figure 3 As shown, Figure 2 This is a schematic diagram of the structure of the flue plate 400 provided in the embodiment of the present application. Figure 3 A partial cross-sectional view of the first channel 402 provided in an embodiment of the present application, wherein a flue plate 400 is fixedly disposed on one side of the frame and is used to support the bottom of the battery cell 201, and the flue plate 400 is provided with a plurality of groove sections 401 corresponding to the positions of the second explosion-proof valves, respectively, and a plurality of first channels 402 are formed between the plurality of groove sections 401 and the corresponding battery cells 201.

[0044] The flue plate 400 is used to support the battery cell 201. The flue plate 400 is provided with a plurality of groove sections 401, which are located at the lower part of the second explosion-proof valve. A plurality of first channels 402 are formed between the groove sections 401 and the battery cell 201 for heat dissipation and as an exhaust path in case of thermal runaway.

[0045] like Figure 1 , Figure 3 as well as Figure 4 As shown, Figure 4A partial cross-sectional view of a second channel 403 provided in an embodiment of the present application, wherein the baffle member 202 close to the first side beam member 103 is spaced apart from the first side beam member 103 and is connected to the flue plate 400, a limiting plate 203 is fixedly provided between the baffle member 202 and the first side beam member 103, so that the baffle member 202, the limiting plate 203, the first side beam member 103 and the flue plate 400 are combined to form a second channel 403 connected to multiple first channels 402, and a connecting hole 404 connecting the first space 105 and the second channel 403 is provided on the first side beam member 103.

[0046] like Figure 4 As shown, the baffle member 202 is arranged at intervals with the first side beam member 103 and connected to the flue plate 400. A limiting plate 203 is fixed between the baffle member 202 and the first side beam member 103, and these structures are enclosed together to form a second channel 403. The second channel 403 is connected with multiple first channels 402, which helps to guide gas or heat in the event of thermal runaway, extend the exhaust path, reduce the gas temperature in the first explosion-proof valve 107 area, and reduce the impact of thermal runaway airflow on other parts of the battery pack.

[0047] It should be noted that the flue plate 400 is arranged at the bottom of the battery cell 201. When a bump occurs on the bottom of the battery pack, the flue plate 400 and the reserved first channel 402 can also effectively protect the second explosion-proof valve at the bottom of the adjacent battery cell 201 to prevent heat diffusion of the battery cell 201. This effectively avoids thermal runaway caused by damage to the second explosion-proof valve of the battery cell 201 due to bottom bump, thereby ensuring the safety and reliability of the battery pack.

[0048] In order to facilitate the arrangement of the battery cells 201 and ensure the consistency of the arranged battery cells 201 , a first support unit 701 may be added between the flue plate 400 and the battery cells 201 to improve the stability of the battery cells 201 .

[0049] like Figure 1 , Figure 3 as well as Figure 4As shown, the space formed by the first channel 402 at the bottom of the battery cell 201 increases the support of the position of the second explosion-proof valve on the battery cell 201 in the longitudinal space of the vehicle. A bottom guard plate 700 is also arranged at the bottom of the flue plate 400. The bottom guard plate 700 is sealed and connected to the frame, and the bottom guard plate 700 is fixedly connected to the flue plate 400. For example, a plurality of crossbeams and longitudinal beams are arranged inside the frame, and the bottom guard plate 700 and the flue plate 400 can be connected to the crossbeams and longitudinal beams inside the frame at the same time by fasteners. The bottom guard plate 700 can prevent external factors from directly impacting the battery pack, ensure the safety and integrity of the battery, increase the overall rigidity of the vehicle chassis, and have a positive effect on improving the driving stability and comfort of the vehicle. At the same time, the bottom guard plate 700 can isolate water and dust entering from the bottom of the vehicle, especially when driving in bad weather or complex road conditions, reducing the risk of damage to the electronic system and battery system.

[0050] Since the first channel 402 increases the support for the position of the second explosion-proof valve on the battery cell 201 in the longitudinal space of the vehicle, a second support unit 703 of the flue plate 400 is correspondingly arranged between the flue plate 400 and the bottom guard plate 700. The second support unit 703 is arranged on both sides of the groove section 401 and is consistent with the thickness of the groove section 401, thereby maintaining the stability of the groove section 401 and the first channel 402 in complex working conditions.

[0051] like Figure 1 , Figure 3 as well as Figure 4 As shown, since the first channel 402 increases the support for the position of the second explosion-proof valve on the battery cell 201 in the longitudinal space of the vehicle, different from the implementation method of setting the second support unit 703, the second support unit 703 can also be directly set as a plurality of support cavities in the flue plate 400, thereby improving the overall structural strength of the flue plate 400, and the support cavities are arranged on both sides of the groove segment 401 to maintain the stability of the groove segment 401 and the first channel 402 in complex working conditions.

[0052] like Figure 1 , Figure 3 as well as Figure 4 As shown, further, a buffer protection member 702 may be arranged between the bottom guard plate 700 and the flue plate 400 to improve the impact resistance and structural strength of the battery pack, thereby enhancing the protection of the second explosion-proof valve on the battery cell 201. As an optional embodiment, the buffer protection member 702 may be foam.

[0053] In actual operation, a bottom guard plate 700 with a honeycomb sandwich structure may be used to obtain a better heat preservation function, effectively maintain a constant temperature of the battery pack, and improve the energy density of the battery pack.

[0054] In actual operation, the bottom guard plate 700 may also be made of composite materials. Compared with metal materials, the bottom guard plate 700 has the advantages of being lightweight, corrosion-resistant, insulating, noise-reducing, and having low thermal conductivity, which helps to improve the mileage of the entire vehicle.

[0055] like Figure 4 As shown, a connecting hole 404 is provided on the first side beam 103 for connecting the first space 105 with the second channel 403. When thermal runaway occurs, the connecting hole 404 provides a guiding path for the stability of the thermal runaway airflow, thereby further enhancing the safety of the battery pack.

[0056] In an optional embodiment, the working principle of the battery pack in the present application is: the battery pack includes a frame, a battery cell 201 assembly, a circuit assembly 300 and a flue plate 400, the frame is provided with a control cabin 101 and a battery cabin 102, the frame includes a first side beam 103, the first side beam 103 is partitioned with a first space 105 and a second space 106 to reduce the risk of the circuit assembly 300 being affected by the thermal runaway of the battery cell 201, the first side beam 103 is arranged with a first explosion-proof valve 107 connected to the first space 105, and the first space 105 guides and discharges the thermal runaway airflow, The second space 106 provides an installation base for the related components of the electric control system and provides a more stable thermal and electrical separation condition. The battery cell 201 assembly is arranged in the battery compartment 102 of the frame. The battery cell 201 assembly includes a plurality of battery cells 201 and a baffle 202 clamped at the end of the battery cell 201. A second explosion-proof valve is arranged at the bottom of the battery cell 201. The pole ear of the battery cell 201 and the second explosion-proof valve are arranged on different sides of the battery cell 201. The pole ear of the battery cell 201 and the second explosion-proof valve are arranged on different sides of the battery cell 201, which reduces the impact of the thermal runaway airflow on the pole ear and related connection parts during thermal runaway. The circuit assembly 300 is arranged in the control compartment 101 of the frame and is electrically connected to the battery cell 201, which helps to protect the circuit assembly 300 from the direct impact of the thermal runaway of the battery cell 201.

[0057] The flue plate 400 is fixedly arranged on one side of the frame and is used to support the bottom of the battery cell 201. The flue plate 400 is provided with a plurality of groove sections 401 corresponding to the positions of the second explosion-proof valves respectively. A plurality of first channels 402 are formed between the plurality of groove sections 401 and the corresponding battery cells 201. The first channels 402 are used for heat dissipation and also serve as an exhaust path for high-temperature flue gas during thermal runaway.

[0058] The baffle member 202 close to the first side beam member 103 is arranged at an interval with the first side beam member 103 and is connected to the flue plate 400. A limiting plate 203 is fixedly provided between the baffle member 202 and the first side beam member 103, so that the baffle member 202, the limiting plate 203, the first side beam member 103 and the flue plate 400 are combined to form a second channel 403 connected to multiple first channels 402. The first side beam member 103 is provided with a connecting hole 404 connecting the first space 105 and the second channel 403.

[0059] The second channel 403 is connected to the first channel 402, and is used to guide the high-temperature smoke generated during thermal runaway to gather on the side away from the control cabin 101 and release it, so as to ensure the simultaneous unobstructed exhaust of the bottom of the battery cell 201, extend the exhaust path, reduce the smoke temperature in the explosion-proof valve area, ensure that the battery pack only smokes but does not catch fire during thermal runaway, perform thermoelectric separation management more stably, stably control and guide the heat and gas generated during thermal runaway, so as to reduce damage to the battery pack as a whole, and improve the safety and reliability of the power battery.

[0060] like Figure 1 , Figure 3 As shown, in an optional embodiment, a plurality of partition plates 500 are fixedly provided on the flue plate 400 , and the plurality of partition plates 500 are arranged between the groove section 401 and the battery cell 201 , and the thermal runaway airflow ejected from the battery cell 201 can break through the partition plates 500 and enter the first channel 402 .

[0061] A plurality of partition plates 500 fixedly mounted on the flue plate 400 are arranged between the groove section 401 and the battery cell 201. Additional physical isolation can be further provided to reduce potential heat spread between the battery cells 201, while providing a clear flow path for the hot air flow when a thermal runaway event occurs.

[0062] It should be noted that when a battery cell 201 has thermal runaway, the second explosion-proof valve at the bottom of the battery cell 201 sprays a high-temperature thermal runaway airflow to the corresponding first channel 402. Since multiple first channels 402 are connected through the second channels 403, the high-temperature thermal runaway airflow at this time will spread to the first space 105 at the bottom of different battery cells 201. At this time, only the partition plate 500 at the bottom of the battery cell 201 that has thermal runaway is broken by the airflow, and the other partition plates 500 are not affected by the directional impact force, and can be stably blocked between the first channel 402 and the normal battery cells 201, so as to prevent the high-temperature thermal runaway airflow from affecting other normal battery cells 201, thereby controlling the trend of heat spread and improving stability.

[0063] In an optional embodiment, the melting point of the partition plate 500 is greater than the temperature of the thermal runaway gas flow.

[0064] like Figure 1 , Figure 3 As shown, when the partition plate 500 is actually configured, the material selection of the partition plate 500 is such that the melting point of the partition plate 500 is higher than the temperature of the thermal runaway airflow. In the case of thermal runaway, the partition plate 500 will not melt due to the high-temperature heat transfer of the thermal runaway airflow, thereby maintaining the structural integrity of the partition plate 500 and ensuring that the thermal runaway airflow can be stably isolated from the normal battery cells 201 instead of spreading randomly, which helps to control the impact range of the thermal runaway and prevent the explosion-proof valve at the bottom of the normal battery cell 201 from being ignited.

[0065] Specifically, the material selection of the partition plate 500 directly affects the safety and performance of the battery pack. In order to ensure that the melting point of the partition plate 500 is greater than the temperature of the thermal runaway airflow.

[0066] The partition plate 500 can be arranged as a ceramic material or a carbon fiber reinforced composite material. The ceramic material has an extremely high melting point and excellent high temperature resistance, and is suitable for the high temperature environment during thermal runaway inside the battery pack. The carbon fiber reinforced composite material has the advantage of being lightweight while maintaining a high melting point and good mechanical properties.

[0067] The partition plate 500 may also be arranged as aramid or continuous glass fiber reinforced polypropylene. Aramid has excellent heat resistance and mechanical strength and is suitable for high temperature environment during thermal runaway inside the battery pack.

[0068] The partition plate 500 may also be arranged as a silicon-based thermal runaway heat barrier material or a hot-pressed mica plate or a ceramicized silicone rubber composite material, such as having low density, high fire resistance and excellent heat insulation effect.

[0069] When selecting the material of the partition plate 500, factors such as heat resistance, mechanical strength, thermal conductivity, flame retardancy, and cost need to be comprehensively considered to ensure the safety and reliability of the battery pack. At the same time, the processing performance and recyclability of the material also need to be considered to meet the requirements of industrial production and environmental protection.

[0070] In the management system of the battery pack, monitoring of the status of the partition plate 500 may also be added so that after a thermal runaway event occurs, the integrity of the partition plate 500 can be evaluated in a timely manner and maintenance or replacement can be performed when necessary.

[0071] In an optional embodiment, a guide area is provided on the partition plate 500 , and the strength of the guide area is lower than the strength of other areas of the partition plate 500 , so as to be broken by the impact of the thermal runaway airflow.

[0072] A guide area is specially arranged on the partition plate 500, and the strength of the guide area is lower than that of other areas on the partition plate 500. Under the impact of the thermal runaway airflow, the guide area becomes a weak point of the partition plate 500 and is easily broken through. The hot airflow is allowed to break through the partition plate 500 in a controlled manner during the impact and enter the first channel 402, rather than destroying the entire partition plate 500 structure in a disorderly manner.

[0073] The guide area may be made of a material different from other parts of the partition plate 500 . The material has lower density and strength and is more likely to break under the impact of thermal runaway airflow, thereby guiding the airflow into the first channel 402 .

[0074] The guide area can also reduce its resistance to the impact of thermal runaway airflow by reducing its thickness, using a weaker connection method, or arranging it in a shape that is easy to break (such as sharp corners, thin walls, etc.). Alternatively, weak points such as scratches and grooves can be preset in the guide area, and these weak points will break first under the impact of thermal runaway airflow.

[0075] These guide area implementations can be used individually or in combination according to specific application requirements to ensure that airflow can be effectively guided in the event of thermal runaway to protect the safety of the battery pack.

[0076] like Figure 1 , Figure 3 as well as Figure 4 As shown, in an optional embodiment, the baffle member 202 arranged on the side of the battery cell 201 away from the side beam member is sealed and connected to the groove segment 401 to seal the end of the first channel 402 away from the second channel 403.

[0077] The baffle member 202 is sealed with the groove section 401, and this seal can prevent the thermal runaway airflow from leaking from the first channel 402 toward the end away from the second channel 403. It is ensured that the thermal runaway airflow flows along the designed path and does not enter the control cabin 101, thereby preventing the thermal runaway airflow from contacting the circuit assembly 300 and causing more severe thermal runaway.

[0078] In order to achieve a sealed connection, appropriate sealing materials can be selected, such as silicone, rubber or other high temperature resistant sealing filling materials, which can maintain good sealing performance at high temperatures. When arranging the sealed connection, it is necessary to consider the thermal expansion characteristics of the material to ensure that the sealed connection will not fail due to thermal expansion within the operating temperature range of the battery pack. It is also necessary to consider its durability to ensure that the sealed connection can resist wear and aging during the long-term use of the battery pack.

[0079] like Figure 1 , Figure 3 as well as Figure 4As shown, in an optional embodiment, a thermal runaway sensor 601 electrically connected to the circuit assembly 300 is provided in the control cabin 101 .

[0080] A thermal runaway sensor 601 is provided in the control cabin 101, and is electrically connected to the circuit assembly 300, for real-time monitoring of the temperature and / or changes inside the battery pack. Once abnormal thermal runaway is detected, the thermal runaway sensor 601 can immediately send a signal to the battery management system (BMS) to trigger corresponding safety measures.

[0081] The thermal runaway sensor 601 may select different types of thermal runaway sensors 601, such as a temperature sensor, a gas sensor or a pressure sensor, to monitor various parameters inside the battery pack and improve the comprehensiveness of safety monitoring.

[0082] The communication between the thermal runaway sensor 601 and the circuit assembly 300 may be wired or wireless to meet different design requirements and improve the flexibility of the system.

[0083] like Figure 1 , Figure 3 as well as Figure 5 As shown, Figure 5 The partial cross-sectional view of the third channel 602 provided in the embodiment of the present application, in an optional embodiment, the frame includes a second side beam 104 fixedly connected to the first side beam 103, a third channel 602 is provided in the second side beam 104, one end of the third channel 602 is connected to the second channel 403, and a detection hole 603 is opened on the second side beam 104, and the detection end of the thermal runaway sensor 601 extends into the detection hole 603. The thermal runaway sensor 601 can monitor multiple parameters inside the thermal runaway airflow flue (first channel 402, second channel 403, third channel 602).

[0084] The frame includes a second side beam 104 fixedly connected to the first side beam 103. The first side beam 103, the second side beam 104 and other side beam structures together enclose the frame as a whole, thereby improving the structural strength of the frame as a whole. For example, a rectangular frame includes two side cross beams and two side longitudinal beams, and the side cross beam away from the circuit assembly 300 can be used as the first side beam 103, and the side longitudinal beam away from the circuit assembly 300 can be used as the second side beam 104.

[0085] The first side beam 103 and the second side beam 104 are actually arranged so that they are perpendicular to each other or arranged at an angle in a preset frame shape, thereby enhancing the structural stability of the battery pack.

[0086] like Figure 1 as well as Figure 5As shown, a third channel 602 is provided in the second side beam 104, which is used to connect the second channel 403 and the detection hole 603 to realize the installation and monitoring of the thermal runaway sensor 601. The detection hole 603 is opened on the second side beam 104, and the detection end of the thermal runaway sensor 601 extends into the detection hole 603 to more accurately monitor the temperature inside the battery pack. This helps to improve the response speed and accuracy of the thermal runaway sensor 601.

[0087] It is worth noting that the arrangement of the third channel 602 and the detection hole 603 can connect the second channel 403 located on one side of the battery cell 201 with the thermal runaway sensor 601 in the control cabin 101 located on the other side of the battery cell 201 without adding other conductive structures under the premise of utilizing the second side beam 104. On the one hand, it makes more effective use of the space in the control cabin 101, so that the thermal runaway sensor 601 which occupies a large space can be arranged stably. On the other hand, it also avoids the thermal runaway sensor 601 which occupies a large space from being arranged in other areas of the battery pack, thereby improving the convenience of the overall arrangement of the battery pack and avoiding spatial interference between the thermal runaway sensor 601 and other related components.

[0088] like Figure 5 As shown, in an optional embodiment, the third channel 602 passes through one or more cavities in the second side beam 104 to connect the third channel 602 with the detection hole 603 .

[0089] The third channel 602 passes through one or more cavities in the second side beam 104 to connect the third channel 602 with the detection hole 603. It can ensure that the detection end of the thermal runaway sensor 601 can be directly connected to the first channel 402, improving the accuracy of monitoring. Since the interior of the second side beam 104 is arranged as multiple independent cavities to improve the structural strength, when arranging the third channel 602 and the detection hole 603, according to the detection end position of the thermal runaway sensor 601 after the arrangement is completed, the corresponding detection hole 603 is opened on the second side beam 104, and the third channel 602 passes through the target number of cavities in the second side beam 104 until it is connected to the cavity where the detection hole 603 is located. The connection setting is completed, and all cavities in the second side beam 104 are prevented from being penetrated. While controlling the temperature of the thermal runaway airflow, the utilization rate of the area on the second side beam 104 is also taken into account.

[0090] like Figure 1 , Figure 3 As shown, in an optional embodiment, the wall thickness of each groove segment 401 is greater than the wall thickness of other positions of the flue plate 400 .

[0091] The thickness of each groove segment 401 is greater than the thickness of the flue plate 400, which can improve the structural strength of the flue plate 400 and ensure that under the impact of thermal runaway airflow, the groove segment 401 can maintain its shape and function and effectively guide the thermal runaway airflow.

[0092] In some embodiments, the battery pack further includes an upper cover and a liquid cooling plate, both of which are located above the battery cell 201 assembly, and the liquid cooling plate contacts the top of the battery cell 201 to dissipate heat from the battery cell 201 or to heat or keep the battery cell 201 warm when the ambient temperature is low. The upper cover and the bottom guard plate 700, or the upper cover and the flue plate 400, respectively close the upper and lower sides of the internal space of the frame, so that the battery pack achieves a higher sealing performance, for example, meeting the sealing requirements of IP67.

[0093] Based on the same inventive concept, the present application also provides a car, which includes a battery pack as described above. Specifically, in the car, except that the battery pack and related components adopt the technical solutions in the above embodiments, the structures, connection relationships, installation positions, etc. of other devices can refer to the relevant disclosures of the prior art and will not be elaborated here.

[0094] It should be understood that the terms first, second, etc. are only used to distinguish descriptions and should not be understood as indicating or suggesting relative importance. Although the terms first, second, etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, the first unit may be referred to as the second unit, and similarly, the second unit may be referred to as the first unit without departing from the scope of the exemplary embodiments of the present invention.

[0095] It should be understood that the term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another relationship between associated objects, indicating that two relationships may exist. For example, A / and B can represent two situations: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0096] It should be understood that in the description of the present invention, the terms "upper", "vertical", "inside", "outside" and the like indicate orientations or positional relationships that are customarily placed when the disclosed product is used, or are orientations or positional relationships that are customarily understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0097] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0098] The terms used herein are only used to describe specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates the opposite meaning. It should also be understood that the terms "include", "comprising", "including", and / or "comprising" when used herein specify the existence of the claimed features, integers, steps, operations, units, and / or components, and do not exclude the existence or increase of one or more other features, quantities, steps, operations, units, components, and / or their combinations.

[0099] Specific details are provided in the following description to facilitate a complete understanding of the exemplary embodiments. However, it should be understood by those of ordinary skill in the art that the exemplary embodiments may be implemented without these specific details. In other embodiments, well-known processes, structures, and techniques may not be shown in unnecessary detail to avoid making the exemplary embodiments unclear.

[0100] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

[0101] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field.

Claims

1. A battery pack with thermal and electrical separation, characterized in that: The battery pack comprises: A frame is provided with a control cabin and a battery cabin, the frame includes a first side beam, a first space and a second space are partitioned inside the first side beam, and a first explosion-proof valve connected to the first space is arranged on the first side beam; A battery cell assembly is arranged in the battery compartment of the frame, the battery cell assembly includes a plurality of battery cells and a baffle member clamped at the end of the battery cell, a second explosion-proof valve is arranged at the bottom of the battery cell, and the tab of the battery cell and the second explosion-proof valve are arranged on different sides of the battery cell; A circuit assembly is disposed in a control compartment of the frame and is electrically connected to the battery cell; A flue plate, fixedly mounted on one side of the frame and used to support the bottom of the battery cell, wherein the flue plate is provided with a plurality of groove sections respectively corresponding to the positions of the second explosion-proof valves, and a plurality of first channels are formed between the plurality of groove sections and the corresponding battery cells; Among them, the baffle member close to the first side beam member is arranged at an interval with the first side beam member, and a limiting plate is fixed between the baffle member and the first side beam member, so that the baffle member, the limiting plate, the first side beam member and the flue plate are combined to form a second channel connected to multiple first channels, and the first side beam member is provided with a connecting hole connecting the first space and the second channel.

2. The battery pack with thermoelectric separation as claimed in claim 1, characterized in that: A plurality of partition plates are fixedly provided on the flue plate, and the plurality of partition plates are arranged between the groove section and the battery cells. The thermal runaway airflow ejected from the battery cells can break through the partition plates and enter the first channel.

3. The battery pack with thermoelectric separation as claimed in claim 2, characterized in that: The melting point of the separator plate is greater than the temperature of the thermal runaway gas flow.

4. The battery pack with thermoelectric separation as claimed in claim 2, characterized in that: A guide area is provided on the partition plate, and the strength of the guide area is lower than the strength of other areas of the partition plate so as to be broken under the impact of the thermal runaway airflow.

5. The battery pack with thermoelectric separation according to any one of claims 1 to 4, characterized in that: The baffle member located at a side of the battery core away from the side beam member is sealed and connected to the groove segment to seal an end of the first channel away from the second channel.

6. The battery pack with thermoelectric separation according to any one of claims 1 to 4, characterized in that: A thermal runaway sensor electrically connected to the circuit assembly is provided in the control cabin.

7. The battery pack with thermoelectric separation as claimed in claim 6, characterized in that: The frame includes a second side beam member fixedly connected to the first side beam member, a third channel is provided in the second side beam member, one end of the third channel is connected to the second channel, and a detection hole is opened on the second side beam member, and the detection end of the thermal runaway sensor extends into the detection hole.

8. The battery pack with thermoelectric separation as claimed in claim 7, characterized in that: The third channel passes through one or more cavities in the second side beam member to connect the third channel with the detection hole.

9. The battery pack with thermoelectric separation according to any one of claims 1 to 3, characterized in that: The wall thickness of each groove segment is greater than the wall thickness of other positions of the flue plate.

10. An automobile, characterized in that: The automobile comprises a battery pack as claimed in any one of claims 1 to 9.

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