Heat dissipation assembly for battery module, battery module, battery pack and vehicle

Abstract

The application discloses a heat dissipation assembly for a battery module, a battery module, a battery pack and a vehicle, and relates to the technical field of battery modules. The heat dissipation assembly comprises a liquid cooling plate, a cooling flow channel is formed in the liquid cooling plate, and the liquid cooling plate is provided with a heat dissipation surface; the contact plates are configured as a plurality of plates arranged at intervals in the thickness direction, a first cavity adapted to accommodate a battery cell is formed between any two adjacent contact plates, and the end of each contact plate is in contact with the heat dissipation surface. According to the heat dissipation assembly, the fixed support of the battery cell is realized by arranging the plurality of contact plates at intervals in the thickness direction, a separate battery cell support structure is not required, the cost is reduced, the heat generated by the battery cell is transmitted to the liquid cooling plate by the plurality of contact plates, the heat dissipation efficiency of the battery module is improved by 3-5%, the first cavity is formed between any two adjacent contact plates, the separate eruption of high-pressure gas is realized, and the safety of the battery module is improved. The heat dissipation assembly is applied to the battery pack, the weight of the battery pack is reduced by 15-20% under the same electric quantity, and the energy density is improved by 12%.

Description

Technical Field

[0001] This invention relates to the field of batteries, and in particular to a heat dissipation component for a battery module, a battery module, a battery pack, and a vehicle. Background Technology

[0002] Among related technologies, there are various types of power batteries for new energy vehicles. Among them, soft-pack cells have advantages such as high safety, light weight and large capacity. However, due to the thin outer packaging of soft-pack cells, corresponding support structures need to be added when integrating them into modules. Furthermore, the integration efficiency of functions such as liquid cooling and monitoring of cell temperature and voltage outside the module is relatively low, and the safety of high-pressure gas ejection in the cell is also insufficient.

[0003] Patent publication number CN214957119U, entitled "A Soft-Pack Battery Cell Unit," discloses a method such as... Figure 12 The battery cells shown are basically grouped together. They are connected to an external BMS via a sampling component signal. The cells are fixed and heat is transferred through adhesive between them and the U-shaped shell. The wiring harness for monitoring the temperature and voltage of the cells is too complex, and a separate fixing structure is required between the cells and the shell.

[0004] The patent with publication number CN114709551A, entitled "A Battery Device and Its Preparation Method", provides a battery device in which the cover plate of the battery module is attached to the liquid cooling plate of the battery pack. The bottom plate of the battery module is provided with an exhaust hole and has a gap between it and the bottom of the box, so that the high-temperature gas or flame generated in the event of thermal runaway can pass through. Finally, it is discharged to the outside through the explosion-proof valve on the box. After the battery cell is directionally ejected, it will spread around in the battery box. The sealing performance of the battery box is required to prevent the high-temperature ejected material from affecting the passenger compartment.

[0005] Therefore, how to simplify the support structure of pouch cells, improve cell safety, and increase the integration efficiency of battery modules has become an urgent problem to be solved in this field. Summary of the Invention

[0006] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a heat dissipation assembly for a battery module. According to the invention, the heat dissipation assembly achieves fixed support for the battery cell by arranging multiple contact plates at intervals in the thickness direction, eliminating the need for a separate battery cell support structure, thus reducing costs. The multiple contact plates transfer the heat generated by the battery cell to the liquid cooling plate, improving the heat dissipation efficiency of the battery module. Furthermore, a first cavity is formed between two adjacent contact plates, enabling the individual ejection of high-pressure gas, thereby improving the safety of the battery module.

[0007] The present invention also proposes a battery module including the above-mentioned heat dissipation components.

[0008] The present invention also proposes a battery pack including the above-mentioned battery module.

[0009] The present invention also proposes a vehicle including the above-described battery pack.

[0010] The heat dissipation assembly according to the present invention includes: a liquid cooling plate having a cooling channel formed therein and a heat dissipation surface formed therein; and contact plates having a plurality of contact plates arranged at intervals in the thickness direction, with a first cavity suitable for accommodating a battery cell formed between two adjacent contact plates, and the end of each contact plate contacting the heat dissipation surface.

[0011] The heat dissipation assembly for a battery module according to the present invention has multiple contact plates spaced apart in the thickness direction. The ends of the multiple contact plates respectively contact the heat dissipation surface of the liquid cooling plate. A first cavity for accommodating battery cells is formed between two adjacent contact plates. The multiple contact plates are in direct contact with the battery cells, which makes the temperature regulation effect of the liquid cooling plate on the battery cells better, the temperature of the battery cells more stable, thereby improving the battery cell life. The multiple contact plates also provide better support for the battery cells. The first cavity formed between two adjacent contact plates accommodates multiple battery cells. The heat generated in the first cavity is transferred to the heat dissipation surface of the liquid cooling plate through the contact plates. The cooling medium or heating medium flowing in the cooling channel of the liquid cooling plate cools or heats the battery cells, thereby ensuring the stability of the battery cell temperature. At the same time, the liquid cooling plate is disposed on top of the battery cells, thereby placing the liquid cooling plate between the battery cells and the passenger compartment. The temperature of the heat radiation generated by the battery cells to the passenger compartment is lower, improving the comfort of the passenger compartment. Each first cavity can realize individual directional gas ejection, and the multiple first cavities do not interfere with each other, improving battery safety.

[0012] According to one embodiment of the present invention, the heat dissipation assembly further includes: a horizontal plate, one side of which is connected to the heat dissipation surface, and the other side of which is connected to the ends of a plurality of contact plates; an inlet and an outlet communicating with the cooling channel are formed on the outer edge of the liquid cooling plate; the cooling channel includes: a first channel segment, which is configured as a plurality of first channel segments and arranged at intervals in a first direction; a second channel segment, which connects one of the plurality of first channel segments to one end of an adjacent first channel segment on the same side; and a third channel segment, which connects one of the plurality of first channel segments to another end of an adjacent first channel segment on the same side; wherein the extension direction of the first channel segment is orthogonal to the extension direction of the second channel segment and the third channel segment, respectively.

[0013] According to one embodiment of the present invention, a limiting plate is formed at one end of each contact plate away from the heat dissipation surface, and at least a portion of the limiting plate overlaps with the projection of the first cavity in the extension direction.

[0014] According to one embodiment of the present invention, a limiting plate is formed at one end of each contact plate away from the heat dissipation surface, and at least a portion of the limiting plate overlaps with the projection of the first cavity in the extension direction.

[0015] The following is a brief description of a battery module according to another embodiment of the present invention.

[0016] The battery module according to the present invention includes a housing, a battery cell, and a heat dissipation assembly as described in any of the above embodiments. A second cavity is formed inside the housing, the heat dissipation assembly is housed in the second cavity, and the battery cell is disposed in a first cavity of the heat dissipation assembly.

[0017] Since the battery module according to the present invention includes the heat dissipation component in any of the above embodiments, there is no need to add a separate cell support structure in the battery module according to the present invention. The internal structure of the battery module is simpler, the heat dissipation efficiency of the cells in the battery module is better, and the safety of the battery module is higher.

[0018] According to one embodiment of the present invention, the battery cell is constructed in multiple ways, with at least two of the battery cells housed in the same first cavity, and a buffer heat insulation structure is arranged between two adjacent battery cells to form an exhaust channel; the battery module further includes an explosion-proof valve, which is disposed at the bottom of the housing and faces the exhaust channel.

[0019] According to one embodiment of the present invention, the battery module further includes: a mica plate disposed at the bottom of the housing, wherein a limiting plate is formed at the end of each contact plate away from the heat dissipation surface, and the limiting plate is connected to the mica plate; a plurality of weakened areas are formed on the mica plate, and the plurality of weakened areas are respectively directly opposite the explosion-proof valve and the exhaust channel in the extension direction of the exhaust channel.

[0020] According to one embodiment of the present invention, the battery module further includes: an end plate, wherein a signal acquisition component is disposed on the side of the end plate facing the second cavity, the signal acquisition component is connected to the tab of the battery cell and is adapted to transmit parameter signals of the battery cell; a connector for connecting to the tab of the battery cell is disposed on the end plate; and a plug is disposed on the side of the end plate away from the second cavity, the plug being connected to the signal acquisition component.

[0021] According to one embodiment of the present invention, the battery module further includes: a cover plate disposed at at least one end of the housing, the cover plate being welded to the housing and sealing the second cavity.

[0022] The following is a brief description of a battery pack according to another embodiment of the present invention.

[0023] The battery pack according to the present invention includes the battery module described in any of the above embodiments. Since the battery pack according to the present invention includes the battery module described in any of the above embodiments, the battery pack according to the present invention can monitor and regulate the cell temperature, resulting in higher battery pack safety, higher battery pack integration, and lower cost.

[0024] The vehicle according to another embodiment of the present invention is briefly described below.

[0025] The vehicle according to the present invention includes the battery pack described in any of the above embodiments. Since the vehicle according to the present invention includes the battery pack described in any of the above embodiments, the battery pack in the vehicle according to the present invention has stronger temperature control capability, the cells in the battery pack can achieve individual directional pressure relief, the battery pack has better pressure relief capability, and the vehicle according to the present invention can monitor the temperature and voltage information in the battery pack in real time, thus improving vehicle safety.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of the battery end plate structure according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of a battery module according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the connection between the liquid cooling plate and the contact plate of a battery module according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of an integrated connection between a battery module liquid cooling plate and a contact plate according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of a separate welded connection between the liquid cooling plate and the contact plate of a battery module according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of a separate adhesive connection between the liquid cooling plate and the contact plate of a battery module according to an embodiment of the present invention;

[0034] Figure 7 This is an exploded view of a battery according to an embodiment of the present invention;

[0035] Figure 8This is a schematic diagram of a battery casing structure according to an embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram of the assembly of a battery module and a battery cell according to an embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of the assembly of a battery module and a battery cell according to an embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of a battery mica plate structure according to an embodiment of the present invention;

[0039] Figure 12 This is an exploded view of a battery cell unit in related technologies.

[0040] Figure label:

[0041] Heat dissipation component 1;

[0042] Liquid cooling plate 11, cooling channel 111, first channel section 1111, second channel section 1112, third channel section 1113, inlet 112, outlet 113; contact plate 12, first cavity 121, limiting plate 122; horizontal plate 13; shell 14, second cavity 141, cover plate 142; battery cell 15; buffer and heat insulation structure 16; mica plate 17, weakening zone 171; end plate 18, signal acquisition component 181, plug-in component 182, connector 183; electrode tab 19. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying 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 accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0044] Among related technologies, there are various types of power batteries for new energy vehicles. Among them, soft-pack cells have advantages such as high safety, light weight and large capacity. However, due to the thin outer packaging of soft-pack cells, corresponding support structures need to be added when integrating them into modules. Furthermore, the integration efficiency of modules for liquid cooling functions and monitoring of cell temperature and voltage is low, and the safety of high-pressure gas ejection in the cells is also insufficient.

[0045] Therefore, how to simplify the support structure of pouch cells to improve cell safety and increase the integration efficiency of battery modules has become an urgent problem to be solved in this field.

[0046] The following is for reference. Figures 1-12 A heat dissipation assembly 1 for a battery module according to an embodiment of the present invention is described.

[0047] The heat dissipation assembly 1 for a battery module according to the present invention includes a liquid cooling plate 11 and a contact plate 12. A cooling channel 111 is formed in the liquid cooling plate 11, and a heat dissipation surface is formed in the liquid cooling plate 11. The contact plates 12 are configured to be a plurality of them spaced apart from each other in the thickness direction. A first cavity 121 suitable for accommodating a battery cell 15 is formed between two adjacent contact plates 12. The end of each contact plate 12 is in contact with the heat dissipation surface.

[0048] Specifically, a cooling channel 111 is formed inside the liquid cooling plate 11, and a cooling medium flows through the cooling channel 111. A heat dissipation surface is formed on the liquid cooling plate 11. Multiple contact plates 12 contact the heat dissipation surface and transfer the heat generated by the battery cell 15 to the liquid cooling plate 11. The cooling medium flowing through the liquid cooling plate 11 carries away the heat, thereby cooling the battery cell 15. The multiple contact plates 12 are spaced apart in the thickness direction. A first cavity 121 for accommodating the battery cell 15 is formed between two adjacent contact plates 12. Multiple battery cells 15 are disposed in the first cavity 121. The heat generated in each first cavity 121 is transferred to the liquid cooling plate 11 through the contact plate 12. The liquid cooling plate 11 carries away the heat by the cooling medium flowing through the cooling channel 111. The multiple first cavities 121 do not interfere with each other. Each first cavity 121 can realize individual gas ejection. The high-pressure gas generated in each first cavity 121 can be individually and directionally ejected from the bottom of the first cavity 121, which improves the safety performance of the battery.

[0049] In some embodiments, a heating medium may also circulate in the liquid cooling plate 11. When the temperature of the battery cell 15 in the battery is low and affects the performance of the battery module, the heating medium circulates in the liquid cooling plate 11 and transfers heat to multiple contact plates 12. The contact plates 12 transfer heat to the battery cell 15 to heat the battery cell 15 and ensure the performance of the battery module.

[0050] In some embodiments, the multiple contact plates 12 can be integrally formed with the heat dissipation surface of the liquid cooling plate 11. The liquid cooling plate 11 directly contacts the multiple battery cells 15 through the multiple contact plates 12, reducing intermediate heat dissipation paths and making the temperature of the battery cells 15 inside the battery more stable, thereby improving the lifespan of the battery cells 15 and ensuring the battery power supply performance.

[0051] According to the present invention, a heat dissipation assembly 1 for a battery module has a plurality of contact plates 12 spaced apart in the thickness direction. The ends of the plurality of contact plates 12 respectively contact the heat dissipation surface of the liquid cooling plate 11, and the contact method can be as follows: Figure 4 The integrated type in the middle can also be Figure 5 The split-welded type can also be used as Figure 6The separate bonding type allows for any method of achieving contact; a first cavity 121 for accommodating the battery cell 15 is formed between two adjacent contact plates 12. Multiple contact plates 12 directly contact the battery cell 15, resulting in better temperature regulation of the battery cell 15 by the liquid cooling plate 11, more stable temperature of the battery cell 15, and thus extended battery cell life. Furthermore, the multiple contact plates 12 provide better support for the battery cell 15. The first cavity 121 is formed between two adjacent contact plates 12. The battery contains multiple battery cells 15. Heat generated in the first cavity 121 is transferred to the heat dissipation surface of the liquid cooling plate 11 via the contact plate 12. The cooling or heating medium flowing through the cooling channels 111 of the liquid cooling plate 11 cools or heats the battery cells 15, thus ensuring stable cell temperature. Simultaneously, the liquid cooling plate 11 is positioned on top of the battery cells 15, placing it between the battery cells 15 and the passenger compartment. This results in lower temperatures radiated from the battery cells 15 into the passenger compartment, improving passenger comfort. Furthermore, each first cavity 121 allows for individual, directional gas ejection, and the multiple first cavities 121 do not interfere with each other, enhancing battery safety.

[0052] In some embodiments, a flow channel protrusion is formed on the liquid cooling plate 11. After the liquid cooling plate 11 is connected to the horizontal plate 13, the side of the horizontal plate 13 facing the liquid cooling plate 11 contacts and connects with the planar portion of the liquid cooling plate 11. The flow channel protrusion formed on the liquid cooling plate 11 and the horizontal plate 13 define a cooling flow channel 111. The cooling medium flows in the cooling flow channel 111. Since the other side of the horizontal plate 13 contacts multiple contact plates 12, the contact plates 12 can better transfer heat to the horizontal plate 13. The flow of the cooling medium facilitates the discharge of heat and improves the heat dissipation performance.

[0053] According to one embodiment of the present invention, the heat dissipation assembly 1 further includes a horizontal plate 13, one side of which is connected to the heat dissipation surface, and the other side of which is connected to the end of a plurality of contact plates 12; the outer edge of the liquid cooling plate 11 is formed with an inlet 112 and an outlet 113 communicating with the cooling channel 111; the cooling channel 111 includes: a first channel segment 1111, which is configured as a plurality and arranged at intervals in a first direction; a second channel segment 1112, which connects one of the plurality of first channel segments 1111 to one end of an adjacent first channel segment 1111 on the same side; and a third channel segment 1113, which connects one of the plurality of first channel segments 1111 to another adjacent first channel segment 1111 on the same side; wherein the extension direction of the first channel segment 1111 is orthogonal to the extension direction of the second channel segment 1112 and the third channel segment 1113, respectively.

[0054] Specifically, one side of the horizontal plate 13 contacts the heat dissipation surface, and the other side of the horizontal plate 13 contacts and is fixed to the ends of multiple contact plates 12. After the multiple contact plates 12 are fixed to the horizontal plate 13, two adjacent vertical plates define the first cavity 121 to support the battery cell 15, which improves the stability of the contact plates 12 supporting the battery cell 15 and prevents the multiple contact plates 12 from shifting during battery use, thereby causing the battery cell 15 to shift and ensuring battery safety. The multiple contact plates 12 can be integrally formed with the horizontal plate 13. One side of the horizontal plate 13 is connected to the heat dissipation surface, and the contact plates 12 on the other side of the horizontal plate 13 transfer heat to the horizontal plate 13. The horizontal plate 13 transfers heat to the liquid cooling plate 11 by connecting to the heat dissipation surface. The cooling medium flowing in the cooling channel 111 of the liquid cooling plate 11 carries away the heat, thereby cooling the battery cell 15.

[0055] like Figure 3 As shown, an inlet 112 and an outlet 113 are formed on the outer edge of the liquid cooling plate 11. The inlet 112 and the outlet 113 are respectively connected to the cooling channel 111. The cooling channel 111 includes a first channel section 1111, a second channel section 1112, and a third channel section 1113. Multiple first channel sections 1111 are constructed and are spaced apart in a first direction. The second channel section 1112 connects one of the multiple first channel sections 1111 with an adjacent... Another first flow channel segment 1111 is connected to one end on the same side, and the third flow channel segment 1113 connects one of the multiple first flow channel segments 1111 to the other end on the same side of the adjacent first flow channel segment 1111. The first flow channel segment 1111, the second flow channel segment 1112 and the third flow channel segment 1113 together form the entire cooling flow channel 111, which increases the extension area of ​​the cooling flow channel 111 on the liquid cooling plate 11, making the heat dissipation of the liquid cooling plate 11 more uniform and improving the temperature regulation capability of the liquid cooling plate 11.

[0056] Furthermore, the liquid cooling plate 11 is disposed on the top of the battery cell 15. The liquid cooling plate 11 contacts the multiple battery cells 15 through multiple contact plates 12. The liquid cooling plate 11 can more precisely cool and heat the battery cells 15 in each first cavity 121. The cooling channel 111 of the coolant can be effectively shortened, and the cooling channel 111 of the liquid cooling plate 11 has a better cooling effect. The outer edge of the liquid cooling plate 11 has an inlet 112 and an outlet 113 that communicate with the cooling channel 111. Except for the inlet 112 and the outlet 113, the other parts of the liquid cooling plate 11 are sealed and protected, so the risk of leakage due to damage from external force is lower.

[0057] According to one embodiment of the present invention, a limiting plate 122 is formed at the end of each contact plate 12 away from the heat dissipation surface, and at least a portion of the limiting plate 122 overlaps with the projection of the first cavity 121 in the extension direction.

[0058] like Figure 2 As shown, a limiting plate 122 is formed at the end of each contact plate 12 away from the heat dissipation surface. The bottom of the battery cell 15 in each first cavity 121 contacts the limiting plate 122. The contact plates 12 on both sides of the first cavity 121 are used to support the side of the battery cell 15. The limiting plate 122 supports the bottom of the battery cell 15 to ensure that the battery cell 15 is installed stably. At least a portion of the limiting plate 122 overlaps with the projection of the first cavity 121 in the extension direction, and a gap is formed between adjacent limiting plates 122. The high-pressure gas generated by the battery cell 15 in the first cavity 121 can be discharged through the gap between adjacent limiting plates 122 to ensure the pressure relief capacity of the first cavity 121 and avoid excessive pressure in the first cavity 121, which could cause the battery to explode.

[0059] The battery module according to the present invention is briefly described below.

[0060] The battery module according to the present invention includes a housing 14, a heat dissipation assembly 1, and a battery cell 15. A second cavity 141 is formed inside the housing 14. The heat dissipation assembly 1 is constructed as described in any of the above embodiments and is housed in the second cavity 141. The battery cell 15 is disposed in the first cavity 121 of the heat dissipation assembly 1.

[0061] Specifically, a second cavity 141 is formed inside the housing 14, and the heat dissipation assembly 1 is housed in the second cavity 141. The heat dissipation assembly 1 is connected to the liquid cooling plate 11 and the limiting plate 122 respectively through the contact plate 12, so as to achieve stable support for the battery cell 15. The heat dissipation assembly 1 and the housing 14 with high structural strength can greatly improve the battery module's ability to withstand being stepped on, so that there is no need to add too many support structures for the battery cell 15 inside the battery module, making the internal structure of the battery module simpler. Furthermore, since the heat dissipation assembly 1 is in direct contact with the battery cell 15 through the contact plate 12, the heat dissipation assembly 1 has a better temperature regulation effect on the battery cell 15, and the temperature of the battery cell 15 is more stable. Each first cavity 121 can realize the directional ejection of high pressure gas, and each first cavity 121 does not interfere with each other, thus improving the safety and pressure relief capability of the battery module.

[0062] Since the battery module according to the present invention includes the heat dissipation component 1 in any of the above embodiments, there is no need to add a separate cell 15 support structure to the battery module according to the present invention. The internal structure of the battery module is simpler, the heat dissipation efficiency of the cell 15 in the battery module is better, and the safety of the battery module is higher.

[0063] According to one embodiment of the present invention, the battery cell 15 is configured as a plurality of cells, at least two cells 15 are housed in the same first cavity 121, and a buffer heat insulation structure 16 is arranged between two adjacent cells 15 to form an exhaust channel; the battery module also includes an explosion-proof valve, which is disposed at the bottom of the housing 14 and faces the exhaust channel.

[0064] Specifically, the battery cell 15 is constructed in multiple ways, which increases the energy density of the battery module. At least two battery cells 15 are housed in the same first cavity 121, and a buffer heat insulation structure 16 is arranged between two adjacent battery cells 15. The buffer heat insulation structure 16 provides space for the expansion of the battery cell 15 to prevent adjacent battery cells 15 from squeezing each other during expansion. The thickness of the buffer heat insulation structure 16 is generally equal to the expansion amount of two battery cells 15. The buffer heat insulation structure 16 has the functions of insulation, flame retardancy and heat insulation, ensuring the safety of the battery cells 15 in the first cavity 121.

[0065] An exhaust channel is provided between two adjacent cells 15 to facilitate the discharge of high-pressure gas in the first cavity 121 and improve the pressure relief capability of the battery module. The battery module also includes an explosion-proof valve, which is located at the bottom of the housing 14 and directly opposite the exhaust channel. Each exhaust channel in the first cavity 121 corresponds to an explosion-proof valve, which improves the pressure relief capability of the battery module and ensures the safety of the battery module.

[0066] According to one embodiment of the present invention, the battery module further includes a mica plate 17, which is disposed at the bottom of the housing 14. A limiting plate 122 is formed at the end of each contact plate 12 away from the heat dissipation surface, and the limiting plate 122 is connected to the mica plate 17. A plurality of weakening areas 171 are formed on the mica plate 17, and the plurality of weakening areas 171 are respectively aligned with the explosion-proof valve and the exhaust channel in the direction of exhaust channel extension.

[0067] like Figure 9 As shown, a mica plate 17 is provided at the bottom of the housing 14. The mica plate 17 is an insulating and high-temperature resistant material. The mica plate 17 has good heat transfer performance. By placing the mica plate 17 at the bottom of the cell 15, the heat transfer performance inside the battery module is enhanced. The mica plate 17 is connected to multiple limiting plates 122, which increases the connection area between the mica plate 17 and the limiting plates 122, making the connection of the mica plate 17 more stable.

[0068] Multiple weakened zones 171 on the mica plate 17 correspond to the explosion-proof valve and the exhaust channel in each first cavity 121, respectively. The high-pressure gas generated in each first cavity 121 is discharged through the exhaust channel. When the pressure in the first cavity 121 reaches the preset pressure, the high-pressure gas pushes open the weakened zone 171 on the mica plate 17. Since the weakened zone 171 and the explosion-proof valve are directly opposite each other in the extension direction of the exhaust channel, the explosion-proof valve is opened after the weakened zone 171 is pushed open by the high-pressure gas to release pressure. Each first cavity 121 can exhaust gas through the weakened zone 171 alone, which improves the pressure relief capability of the battery module.

[0069] According to one embodiment of the present invention, the battery module further includes an end plate 18, on the side of the end plate 18 facing the second cavity 141, a signal acquisition component 181 is disposed, the signal acquisition component 181 is connected to the tab 19 of the battery cell 15 and is adapted to transmit parameter signals of the battery cell 15; a connector 183 for connecting to the tab 19 of the battery cell 15 is disposed on the end plate 18; a plug 182 is disposed on the side of the end plate 18 away from the second cavity 141, the plug 182 is connected to the signal acquisition component 181.

[0070] like Figure 7 As shown, end plates 18 are provided at both ends of the housing 14. A signal acquisition component 181 is provided on the side of the end plate 18 facing the second cavity 141. The signal acquisition component 181 is connected to the tab 19 of the battery cell 15 through the connector 183 and acquires signals such as voltage and temperature of the battery cell 15 to realize real-time monitoring of the temperature of the battery cell 15. A fixing structure can be provided on the end plate 18 to fix the signal acquisition component 181 and improve the assembly stability of the signal acquisition component 181. The tab 19 of the battery cell 15 can pass through the end plate 18. After the tab 19 passes through the end plate 18, it can be fixed by plastic sealing edge to improve the assembly stability of the battery cell 15. A plug-in component 182 is provided on the side of the end plate 18 away from the second cavity 141. The plug-in component 182 is connected to the signal acquisition component 181 and is used to transmit the signal acquired by the signal acquisition component 181 to external devices.

[0071] The battery module according to the present invention integrates a signal acquisition component 181 and a connector 182 on the end plate 18, which helps to reduce the connection harness in the battery module, simplify the internal connection structure of the battery module, improve the safety of the battery module, improve the integration efficiency of the battery module, and reduce the cost of the connection harness.

[0072] In some embodiments, a connecting copper / aluminum busbar can be provided between the signal acquisition component 181 and the tab 19 of the battery cell 15. The tab 19 of the battery cell 15 can pass through the connecting copper / aluminum busbar and then be bent and welded to realize the series and parallel connection of the battery cell 15.

[0073] According to one embodiment of the present invention, the battery module further includes a cover plate 142, which is disposed at at least one end of the housing 14 and is welded to the housing 14 to seal the second cavity 141.

[0074] According to the present invention, the battery module achieves sealing by welding a cover plate 142 to at least one end of the housing 14, preventing the ejection of high-temperature gas from the battery module from affecting the passenger compartment and improving safety.

[0075] The battery pack according to the present invention is briefly described below.

[0076] The battery pack according to the present invention includes the battery module described in any of the above embodiments. Since the battery pack according to the present invention includes the battery module described in any of the above embodiments, the battery pack according to the present invention can monitor and regulate the temperature of the cell 15, resulting in higher battery pack safety, higher battery pack integration, and lower cost.

[0077] The vehicle according to the present invention is briefly described below.

[0078] The vehicle according to the present invention includes the battery pack described in any of the above embodiments. Since the vehicle according to the present invention includes the battery pack described in any of the above embodiments, the battery pack in the vehicle according to the present invention has stronger temperature control capability, the battery cells 15 in the battery pack can achieve individual directional pressure relief, the battery pack has better pressure relief capability, and the vehicle according to the present invention can monitor the temperature and voltage information in the battery pack in real time, thus improving vehicle safety.

[0079] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, 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 invention.

[0080] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0081] In the description of this invention, "a plurality of" means two or more.

[0082] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0083] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0084] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0085] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery module, characterized in that, include: A housing having a second cavity formed within it; A heat dissipation assembly, which is housed within the second cavity; A battery cell, wherein the battery cell is disposed within the first cavity of the heat dissipation assembly; The heat dissipation component includes: A liquid cooling plate, wherein cooling channels are formed within the liquid cooling plate and a heat dissipation surface is formed within the liquid cooling plate; The contact plates are configured as a plurality of plates spaced apart from each other in the thickness direction, and a first cavity suitable for accommodating the battery cell is formed between two adjacent contact plates. The end of each contact plate is in contact with the heat dissipation surface. The heat dissipation assembly further includes: a horizontal plate, one side of which is connected to the heat dissipation surface, and the other side of which is connected to the ends of the plurality of contact plates; the outer edge of the liquid cooling plate has an inlet and an outlet that communicate with the cooling channel. The cooling channel includes: a first channel segment, wherein multiple first channel segments are arranged at intervals in a first direction; a second channel segment, wherein the second channel segment connects one of the multiple first channel segments to one end of an adjacent first channel segment on the same side; and a third channel segment, wherein the third channel segment connects one of the multiple first channel segments to another end of an adjacent first channel segment on the same side; wherein the extending direction of the first channel segment is orthogonal to the extending direction of the second channel segment and the third channel segment; the multiple contact plates and the horizontal plate are integrally formed; and the liquid cooling plate is disposed on the top of the battery cell, wherein all parts of the liquid cooling plate except for the water inlet and the water outlet are sealed and protected. Each of the contact plates forms a limiting plate at one end away from the heat dissipation surface, and at least a portion of the limiting plate overlaps with the projection of the first cavity in the extension direction; The battery cell is constructed in multiple ways, with at least two cells housed in the same first cavity. A buffer and heat insulation structure is arranged between adjacent two cells to form an exhaust channel. The battery module also includes an explosion-proof valve, which is located at the bottom of the housing and faces the exhaust channel. Each exhaust channel in the first cavity corresponds to one explosion-proof valve. The battery module further includes: a mica plate disposed at the bottom of the housing, with a limiting plate formed at the end of each contact plate away from the heat dissipation surface, the limiting plate being connected to the mica plate; multiple weakening zones are formed on the mica plate, each of the multiple weakening zones being directly opposite the explosion-proof valve and the exhaust channel in the direction of the exhaust channel extension; the multiple weakening zones on the mica plate correspond to the explosion-proof valve and the exhaust channel in each first cavity, respectively, the high-pressure gas generated in each first cavity is discharged through the exhaust channel, the weakening zone is configured to be opened by high-pressure gas when the pressure in the first cavity reaches a preset pressure, so as to open the explosion-proof valve for pressure relief, and each first cavity exhausts gas individually through the corresponding weakening zone.

2. The battery module according to claim 1, characterized in that, Also includes: An end plate is provided with a signal acquisition component on the side of the end plate facing the second cavity. The signal acquisition component is connected to the electrode tab of the battery cell and is adapted to transmit the parameter signal of the battery cell. A connector for connecting to the electrode tab of the battery cell is provided on the end plate. A connector is provided on the side of the end plate away from the second cavity, and the connector is connected to the signal acquisition component.

3. The battery module according to claim 1, characterized in that, Also includes: A cover plate is disposed at at least one end of the housing, and the cover plate is welded to the housing to seal the second cavity.

4. A battery pack, characterized in that, Includes the battery module described in any one of claims 1-3.

5. A vehicle, characterized in that, Includes the battery pack as described in claim 4.

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