Battery pack

Abstract

The utility model relates to battery structure technical field discloses a kind of battery pack, including battery module, battery module includes: exhaust liquid cooling component, including bottom plate and multiple liquid cooling plates, bottom plate has the first side and second side relatively arranged along z direction, multiple liquid cooling plates are connected with the first side and are sequentially spaced along x direction, x direction and z direction are arranged, two adjacent liquid cooling plates are jointly defined to form battery compartment with bottom plate, bottom plate is equipped with multiple exhaust passages, multiple battery compartments and multiple exhaust passages are one-to-one correspondence communication;Multiple battery cells are separately arranged in multiple battery compartments;Flame-retardant sealing sheet is arranged on the second side, and includes multiple weak parts, and multiple weak parts are one-to-one correspondence arranged with multiple exhaust passages.The battery pack of the utility model integrates liquid cooling structure and exhaust structure, simplifies system complexity, improves safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of battery structure technology, specifically to a battery pack. Background Technology

[0002] Lithium-ion batteries are the primary power source for electric bicycles, and their safe, reliable, and high-energy-density battery modules are increasingly favored by the market. However, during the use of lithium-ion batteries, thermal runaway of a single cell can spread to surrounding battery cells, causing a chain reaction. The smoke, fire, and explosion generated during thermal runaway directly threaten the safety of riders and users.

[0003] Battery thermal runaway refers to the phenomenon where, under abnormal conditions (such as overcharging, overheating, mechanical damage, or internal short circuit), the internal temperature of a battery rises sharply, triggering a series of irreversible chemical reactions that may ultimately lead to serious safety accidents such as fire or explosion.

[0004] With the introduction of relevant national standards such as the "Safety Technical Specifications for Lithium-ion Batteries for Electric Bicycles", how to reduce the harm caused by thermal runaway after the occurrence of thermal runaway of lithium-ion batteries has become an urgent problem for manufacturers to solve.

[0005] Electric bicycle batteries typically rely on natural or air cooling, which has relatively low heat dissipation efficiency and cannot meet the demands of high-performance, high-energy-density batteries. Therefore, some electric bicycle batteries employ liquid cooling technology. Liquid cooling effectively dissipates heat generated by the battery through the circulation of coolant within the battery. Furthermore, liquid cooling provides more precise temperature control, helping to extend battery life and improve its performance.

[0006] However, in related technologies, the liquid cooling device of the battery pack mainly focuses on heat dissipation, while neglecting the importance of battery venting. During the charging and discharging process of the battery, a certain amount of gas is generated. If the venting is not smooth, it will lead to an increase in the internal pressure of the battery, affecting the safety and stability of the battery. Utility Model Content

[0007] In view of this, the present invention provides a battery pack to solve the problem that the separation of the cooling structure and the venting structure of the battery pack leads to poor battery safety and stability.

[0008] This utility model provides a battery pack, including a battery module. The battery module includes: an exhaust liquid cooling assembly, including a base plate and multiple liquid cooling plates. The base plate has a first side and a second side arranged opposite to each other along the z-direction. The multiple liquid cooling plates are all connected to the first side and are arranged at intervals along the x-direction, with the x-direction and z-direction intersecting. Two adjacent liquid cooling plates and the base plate together define a battery compartment. The base plate is provided with exhaust channels, and the multiple battery compartments are connected to the multiple exhaust channels in a one-to-one correspondence. Multiple battery cells are disposed in the multiple battery compartments. A flame-retardant sealing sheet is disposed on the second side and includes multiple weak parts, and the multiple weak parts are arranged in a one-to-one correspondence with the multiple exhaust channels.

[0009] Beneficial effects: First, the liquid cooling plate forming the battery compartment can exchange heat with the battery cells inside, rapidly cooling them. Furthermore, when a cell in a battery compartment experiences thermal runaway, the high-temperature gas generated by the cell is ejected towards the exhaust channel. This high-temperature gas applies pressure to the weak points through the exhaust channel, causing them to break open and allowing the gas to escape to the outside of the battery compartment. This prevents the high-temperature gas from accumulating inside the battery compartment and thus prevents damage to the battery cells due to high pressure or temperature. Because the remaining weak points of the flame-retardant sealant remain intact, high-temperature gas is prevented from entering other battery compartments through other exhaust channels, achieving thermal diffusion protection. Therefore, in this utility model, the connection between the base plate with exhaust function and the liquid cooling plate with liquid cooling function enables the exhaust liquid cooling component to have both heat dissipation and exhaust functions. This not only reduces the complexity of the system but also ensures the heat dissipation and exhaust effects. Furthermore, the liquid cooling plate and the base plate define multiple battery compartments, each forming an independent space. This avoids the temperature of the cells in multiple battery compartments from affecting each other, reduces the risk of thermal runaway and thermal propagation, improves the safety and stability of the battery pack, extends the service life of the battery pack, and improves the performance of the battery pack.

[0010] In one optional embodiment, the flame-retardant seal further includes: a main body; a plurality of easily tearable connecting parts, wherein the plurality of easily tearable connecting parts are connected one-to-one with the plurality of weak parts, the easily tearable connecting parts are connected between the main body and the corresponding weak parts and surround the corresponding weak parts, and the projection of the weak parts on the base plate at least partially overlaps with the corresponding exhaust channel.

[0011] Beneficial effect: Because the easily tearable joint is easy to break, it is easy to separate the main body and the weak part, so the gas in the battery compartment can be easily discharged from the exhaust channel.

[0012] In one alternative embodiment, the projection of the weak portion onto the base plate covers the corresponding exhaust channel.

[0013] Beneficial effect: It can effectively prevent gas outside the battery compartment from breaking through the easily torn joint and entering the battery compartment.

[0014] In one optional embodiment, the battery pack further includes: a housing, covering the outside of the battery module, defining a potting area and a venting area between the battery module and the housing, the potting area and the venting area being separated by the base plate; a potting layer, disposed in the potting area, the potting layer sealing the side of the battery compartment away from the base plate along the z direction and the opposite sides of the battery compartment along the y direction, the x direction, y direction and z direction being arranged in pairs; and a sealant strip, disposed between the base plate and the housing.

[0015] Beneficial effects: By setting a potting layer in the potting area, the position of the battery module and the casing can be fixed, and the gas generated by the battery cell can be prevented from diffusing into the potting area. Instead, the gas generated by the battery cell can be diffusing into the venting area. Setting a baffle strip can prevent the potting layer from flowing into the venting area and ensure the smooth venting of the venting area.

[0016] In one optional embodiment, the housing is provided with an exhaust port that communicates with the exhaust zone, and the battery pack further includes an explosion-proof valve that is connected to the housing and seals the exhaust port; and / or, the battery pack further includes a flame-retardant structure that is located within the exhaust zone and is fitted against the inner wall of the housing.

[0017] Beneficial effects: When the high-temperature gas accumulates to a certain level in the exhaust zone and the explosion-proof valve reaches a certain pressure, the high-temperature gas is discharged from the explosion-proof valve, preventing excessive pressure in the exhaust zone from causing high-temperature gas to rush into other battery compartments. This improves the thermal protection effect of the battery pack and enhances safety. The flame-retardant structure prevents high-temperature gas from damaging the casing, reducing the probability of casing damage.

[0018] In one optional embodiment, the battery cell includes a battery cell body and a tab, the battery cell body and the tab are connected, the base plate and the tab are located on opposite sides of the battery cell body along the z-direction, and the tab passes through the potting layer.

[0019] Beneficial effects: The gas inside the battery compartment diffuses along the z-direction away from the electrode tabs, which can achieve thermoelectric separation and improve safety.

[0020] In one optional embodiment, the battery pack further includes: a flame-retardant heat insulation component disposed within the battery compartment and located on one side of the battery cell along the x-direction; the side of the battery cell facing away from the flame-retardant heat insulation component is connected to the liquid cooling plate; and the flame-retardant heat insulation component is disposed between the battery cells of two adjacent battery compartments.

[0021] Beneficial effects: Flame-retardant and heat-insulating components can prevent fire, flame retard, and heat, avoid heat exchange between cells in two adjacent battery compartments, and when a cell in one battery compartment experiences thermal runaway, the temperature is difficult to transfer to adjacent battery compartments, further preventing the probability of heat spread and thus reducing the probability of overall thermal runaway of the battery pack.

[0022] In one alternative embodiment, the battery pack further includes an elastic element disposed within the battery compartment, wherein the elastic element and the flame-retardant and heat-insulating element are located on the same side of the battery cell along the x-direction.

[0023] Beneficial effects: The elastic element can undergo elastic deformation, providing deformation space for the expansion of the battery cell, and the elastic element can provide pre-tightening force for the battery cell, reducing the probability of the battery cell shaking in the battery compartment.

[0024] In one optional embodiment, the flame-retardant heat insulation component includes a heat insulation layer and a flame-retardant layer, with the elastic element located between the heat insulation layer and the flame-retardant layer.

[0025] Beneficial effects: Integrating the flame-retardant heat-insulating component and the elastic component into a single structure facilitates their installation, improves assembly efficiency, and helps ensure the relative positions of the battery cell, flame-retardant heat-insulating component, and elastic component.

[0026] In one optional embodiment, the base plate is provided with a main liquid channel, the two ends of which penetrate the periphery of the base plate to form an inlet and an outlet, each of the liquid cooling plates is provided with a distribution channel, and multiple distribution channels are connected to the main liquid channel.

[0027] Beneficial effects: It can improve the supply efficiency of coolant and simplify the structure of the fluid passage. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the battery pack structure according to an embodiment of the present invention;

[0030] Figure 2 This is an exploded view of the battery pack according to an embodiment of the present invention;

[0031] Figure 3 This is one of the schematic diagrams showing the fit between the housing and the battery module in an embodiment of this utility model;

[0032] Figure 4 This is the second schematic diagram showing the fit between the housing and the battery module in an embodiment of this utility model;

[0033] Figure 5 For along Figure 4 Sectional view of line AA in the middle;

[0034] Figure 6 This is a schematic diagram illustrating the assembly of the exhaust liquid cooling component, battery cell, flame-retardant heat insulation component, and elastic component according to an embodiment of this utility model.

[0035] Figure 7 This is one of the structural schematic diagrams of the exhaust liquid cooling assembly according to an embodiment of the present utility model;

[0036] Figure 8 For along Figure 7 Sectional view of the middle BB line;

[0037] Figure 9 This is a second schematic diagram of the structure of the exhaust liquid cooling assembly according to an embodiment of the present utility model;

[0038] Figure 10 for Figure 9 A cross-sectional view along the CC line;

[0039] Figure 11 This is a schematic diagram of the structure of the heat insulation sealing sheet according to an embodiment of the present utility model;

[0040] Figure 12 This is a schematic diagram of the structure of the flame-retardant and heat-insulating component and the elastic component in an embodiment of this utility model.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Battery pack; 2. Battery module; 100. Exhaust liquid cooling assembly; 110. Base plate; 111. First side; 112. Second side; 113. Exhaust channel; 114. Main liquid channel; 114a. Main liquid inlet; 114b. Main liquid outlet; 114c. Liquid inlet; 114d. Liquid outlet; 120. Liquid cooling plate; 121. Battery compartment; 122. Liquid distribution channel; 122a. First flow channel; 122b. Second flow channel; 122c. 1. Third flow channel; 200. Battery cell; 300. Flame-retardant sealing sheet; 310. Main body; 320. Weak part; 330. Easily tearable connection part; 331. Through hole; 400. Flame-retardant heat insulation component; 410. Heat insulation layer; 420. Flame-retardant layer; 500. Elastic component; 600. Shell; 610. Glue potting area; 620. Venting area; 630. Box body; 640. Top cover; 641. Vent; 700. Glue-blocking strip; 800. Electrical components. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0047] The following is combined Figures 1 to 12 The following describes embodiments of the present invention.

[0048] According to an embodiment of the present invention, a battery pack 1 is provided, the battery pack 1 includes a battery module 2, the battery module 2 includes an exhaust liquid cooling assembly 100, a plurality of battery cells 200 and a flame-retardant sealing sheet 300.

[0049] The exhaust liquid cooling assembly 100 includes a base plate 110 and multiple liquid cooling plates 120. The base plate 110 has a first side surface 111 and a second side surface 112 arranged opposite each other along the z-direction. Each of the multiple liquid cooling plates 120 is connected to the first side surface 111. The multiple liquid cooling plates 120 are arranged sequentially at intervals along the x-direction, with the x-direction and z-direction intersecting. The x-direction and z-direction can be perpendicular. Two adjacent liquid cooling plates 120 and the base plate 110 together define a battery compartment 121. The base plate 110 has multiple exhaust channels 113, and the multiple battery compartments 121 are connected to the multiple exhaust channels 113 in a one-to-one correspondence. Multiple battery cells 200 are disposed within the multiple battery compartments 121. Each battery compartment 121 can contain one battery cell 200, or it can contain two, three, or more battery cells 200.

[0050] The flame-retardant sealing strip 300 is disposed on the second side 112. The flame-retardant sealing strip 300 includes multiple weak parts 320, and the multiple weak parts 320 are disposed in a one-to-one correspondence with multiple exhaust channels 113.

[0051] It should be noted that the battery cell 200 is a pouch battery cell, and the side of the battery cell 200 facing the exhaust channel 113 is sealed. Furthermore, the exhaust channel 113 may include one or more exhaust holes spaced apart, and the exhaust holes penetrate the base plate 110 along the thickness direction of the base plate 110.

[0052] For example, the exhaust liquid cooling component 100 may be made of aluminum brazed composite material, which has advantages such as lightweight, corrosion resistance, and brazing process, and has excellent heat dissipation performance. The flame-retardant sealing sheet 300 may include mica paper, which is a functional material made of phlogopite or muscovite through pulping and papermaking. It has an extremely high fire resistance limit and can play a role in physically isolating fire.

[0053] In this invention, the liquid cooling plate 120 forming the battery compartment 121 can exchange heat with the battery cells 200 inside the battery compartment 121, rapidly cooling the battery cells 200. When a battery cell 200 in one battery compartment 121 experiences thermal runaway, the high-temperature gas generated by the cell 200 is ejected towards the exhaust channel 113. This high-temperature gas applies pressure to the weak portion 320 through the exhaust channel 113, tearing the weak portion 320 and allowing the high-temperature gas to escape from the exhaust channel 113 to the outside of the battery compartment 121. This prevents the high-temperature gas from accumulating inside the battery compartment 121 and prevents damage to the battery cells due to high pressure or high temperature. Since the remaining weak portions 320 of the flame-retardant sealant 300 remain intact, high-temperature gas is prevented from entering other battery compartments 121 through the remaining exhaust channels 113, achieving thermal diffusion protection.

[0054] In addition, generally speaking, the battery cell 200 includes a tab and a battery cell body. The battery cell body and the tab are connected. The base plate and the tab are located on opposite sides of the battery cell body along the z-direction. The electrical component 800 and the tab are located on the same side of the battery cell body along the z-direction. That is, the electrical component 800 and the base plate 110 are located on opposite sides of the battery cell 200 along the z-direction. Since the gas generated by the battery cell 200 diffuses out of the battery compartment 121 through the base plate 110 of the exhaust liquid cooling assembly 100, it can effectively prevent the gas generated by the battery cell 200 from diffusing to the electrical component 800 and the tab, thereby achieving thermal and electrical separation and improving the safety of the battery pack 1.

[0055] In this invention, the base plate 110 with exhaust function and the liquid cooling plate 120 with liquid cooling function are connected, so that the exhaust liquid cooling component 100 has both heat dissipation and exhaust functions. This not only reduces the complexity of the system, but also ensures the heat dissipation and exhaust effects. Furthermore, the liquid cooling plate 120 and the base plate 110 define multiple battery compartments 121, each forming an independent space. This avoids the temperature of the cells 200 in the multiple battery compartments 121 from affecting each other, reduces the risk of thermal runaway and thermal propagation, improves the safety and stability of the battery pack 1, extends the service life of the battery pack 1, and improves the performance of the battery pack 1.

[0056] Specifically, the flame-retardant sealing sheet 300 includes a main body 310 and a plurality of easily tearable connecting parts 330. The plurality of easily tearable connecting parts 330 are provided in a one-to-one correspondence with a plurality of weak parts 320. The easily tearable connecting parts 330 are connected between the main body 310 and the corresponding weak parts 320. The weak parts 320 are surrounded by the corresponding easily tearable connecting parts 330. The projection of the weak parts 320 on the base plate 110 at least partially overlaps with the corresponding exhaust channel 113.

[0057] like Figure 11 As shown, in some embodiments, the easily tearable connector 330 is provided with a plurality of through holes 331, which are arranged at intervals along the circumference of the weak portion 320. By providing through holes 331, the structural strength of the easily tearable connector 330 can be reduced, making the easily tearable connector 330 easier to break. Thus, when the pressure inside the battery compartment 121 is too high, the easily tearable connector 330 is torn, and the gas inside the battery compartment 121 can be discharged through the exhaust channel 113, thereby improving the safety and stability of the battery pack 1.

[0058] In other embodiments, the tearable connector 330 may be provided with a thinning groove so that the thickness of the tearable connector 330 is less than the thickness of the weak portion 320 and the thickness of the main body portion 310, thereby making the tearable connector 330 easy to break.

[0059] Furthermore, the projection of the weak portion 320 onto the base plate 110 covers the corresponding exhaust channel 113, meaning the outline of the projection of the weak portion 320 onto the base plate 110 surrounds the exhaust channel 113. In other words, the cross-sectional area of ​​the weak portion 320 is larger than the opening area of ​​the exhaust channel 113, and the easily tearable connector 330 is offset from the exhaust channel 113, effectively preventing gas outside the battery compartment 121 from breaking through the easily tearable connector 330 and entering the battery compartment 121. Moreover, when the easily tearable connector 330 is torn, the exhaust channel 113 is completely open, ensuring smooth gas discharge from the battery compartment 121.

[0060] In addition, when the easily tearable connection 330 is provided with a through hole 331, since the through hole 331 is offset from the exhaust channel 113, it can also prevent gas outside the battery compartment 121 from entering the battery compartment 121 through the through hole 331, thereby improving the effect of heat diffusion protection.

[0061] Of course, those skilled in the art will understand that the easily tearable connector 330 may have both a through hole 331 and a thinning groove. Of course, other construction methods for the easily tearable connector 330 to achieve easy separation of the weak portion 320 and the main body 310 are also within the scope of protection of this utility model.

[0062] In some embodiments, such as Figure 8 and Figure 10 As shown, the base plate 110 is provided with a main liquid channel 114, the two ends of which penetrate the circumferential surface of the base plate 110 to form an inlet 114c and an outlet 114d. Each liquid cooling plate 120 is provided with a distribution channel 122, and multiple distribution channels 122 are connected to the main liquid channel 114. The base plate 110 and the multiple liquid cooling plates 120 are integrally formed, or the base plate 110 and the multiple liquid cooling plates 120 are welded into a single structure.

[0063] This ensures the sealing performance and connection strength between the base plate 110 and each liquid cooling plate 120, preventing gaps between them and reducing the probability of coolant leakage. Furthermore, by supplying coolant to the branch channels 122 of each liquid cooling plate 120 through the main fluid channel 114 of the base plate 110, the coolant supply efficiency is improved, and the fluid channel structure is simplified.

[0064] Specifically, the distribution channel 122 includes multiple first flow channels 122a, second flow channels 122b, and third flow channels 122c. The first flow channels 122a are perpendicular to the bottom plate 110 and are arranged at intervals. The second flow channels 122b and third flow channels 122c are located on opposite sides of the length direction of the first flow channels 122a. One end of each first flow channel 122a is connected to an adjacent first flow channel 122a through the second flow channel 122b, and the other end is connected to another adjacent first flow channel 122a through the third flow channel 122c. The second flow channels 122b and third flow channels 122c can be constructed in an arc shape.

[0065] The main liquid channel 114 includes a main liquid inlet channel 114a and a main liquid outlet channel 114b, both extending in a direction perpendicular to the liquid cooling plate 120. Each battery compartment 121 is located between the main liquid inlet channel 114a and the main liquid outlet channel 114b. One of the two outermost first flow channels 122a in the distribution channels 122 communicates with the main liquid inlet channel 114a, and the other communicates with the main liquid outlet channel 114b. The main liquid inlet channel 114a penetrates the circumferential surface of the base plate 110 to form a liquid inlet 114c, and the main liquid outlet channel 114b penetrates the circumferential surface of the base plate 110 to form a liquid outlet 114d.

[0066] In this way, multiple liquid channels 122 share the same main liquid inlet channel 114a and main liquid outlet channel 114b. The main liquid channel 114 has a simple structure and is separated from the exhaust channel 113, avoiding interference between the exhaust channel 113, the main liquid inlet channel 114a, and the main liquid outlet channel 114b. The base plate 110 can be connected to quick-connect fittings. One quick-connect fitting is inserted into the liquid inlet 114c, and the other into the liquid outlet 114d. The quick-connect fittings are used to connect the external cooling system to the main liquid inlet channel 114a and the main liquid outlet channel 114b, thereby facilitating heat exchange with the coolant.

[0067] By dividing the liquid distribution channel 122 into multiple first flow channels 122a, multiple second flow channels 122b, and multiple third flow channels 122c, and constructing the liquid distribution channel 122 in a serpentine shape, the flow path of the coolant can be extended. The heat exchange time between the coolant and the battery cell 200 in the liquid distribution channel 122 is long, and the heat exchange with each area of ​​the battery cell 200 is uniform. This ensures that the coolant can flow evenly and efficiently through each battery cell 200, thereby achieving effective heat transfer and dissipation of the battery cell 200 and improving heat dissipation capacity.

[0068] In some embodiments, such as Figure 6 and Figure 12As shown, the battery pack 1 also includes a flame-retardant and heat-insulating component 400. The flame-retardant and heat-insulating component 400 is disposed within the battery compartment 121, and is located along the x-direction on one side of the battery cell 200. The side of the battery cell 200 facing away from the flame-retardant and heat-insulating component 400 is connected to the liquid cooling plate 120. A flame-retardant and heat-insulating component 400 is provided between the battery cells 200 in two adjacent battery compartments 121. The flame-retardant and heat-insulating component 400 may include structures with flame-retardant and heat-insulating functions such as aerogel and mica paper. The flame-retardant and heat-insulating component 400 can achieve fireproof, flame-retardant, and heat-insulating effects, preventing heat exchange between the battery cells 200 in two adjacent battery compartments 121. Furthermore, when a battery cell 200 in one battery compartment 121 experiences thermal runaway, the temperature is difficult to transfer to adjacent battery compartments 121, further preventing the probability of heat spread and thus reducing the probability of overall thermal runaway of the battery pack 1.

[0069] Furthermore, the battery pack 1 also includes an elastic element 500, which and the flame-retardant and heat-insulating element 400 are located on the same side of the cell 200 along the x-direction. The elastic element 500 can be a structure with elasticity, such as ceramic silicone foam. Ceramic silicone foam is a functional material made from silicone rubber as a base material, uniformly dispersed with nano-sized ceramic particles, and then molded. It has high temperature resistance and flame-retardant properties, effectively suppressing the combustion reaction of the cell 200 and reducing the hazards caused by thermal runaway.

[0070] The battery cell 200 may expand under normal operating conditions. The elastic element 500 can undergo elastic deformation to provide deformation space for the expansion of the battery cell 200, absorb the expansion volume of the battery cell 200, and provide pre-tightening force for the battery cell 200, reducing the probability of the battery cell 200 shaking in the battery compartment 121, improving the positional stability of the battery cell 200, and thus reducing the probability of thermal runaway of the battery cell 200.

[0071] Specifically, the flame-retardant and heat-insulating component 400 includes a heat-insulating layer 410 and a flame-retardant layer 420, with an elastic component 500 located between the heat-insulating layer 410 and the flame-retardant layer 420. The heat-insulating layer 410 may include aerogel and is in contact with the liquid cooling plate 120. The flame-retardant layer 420 may include mica paper and is in contact with the battery cell 200. Mica paper is a functional material made from phlogopite or muscovite through pulping and papermaking, possessing extremely high fire resistance and effectively providing physical insulation against fire. Aerogel is a material composed of silica aerogel and glass fiber, exhibiting extremely low thermal conductivity and effectively blocking heat conduction. Furthermore, mica paper and aerogel are relatively inexpensive, making them suitable for large-scale production.

[0072] In this way, the flame-retardant heat insulation component 400 and the elastic component 500 are constructed as a single unit, which facilitates the installation of the flame-retardant heat insulation component 400 and the elastic component 500, improves assembly efficiency, and helps to ensure the relative positions of the battery cell 200, the flame-retardant heat insulation component 400 and the elastic component 500.

[0073] In some embodiments, Figures 1-5 As shown, the battery pack 1 also includes a housing 600, a potting layer, and a sealant strip 700. The housing 600 covers the outside of the battery module 2, and a potting area 610 and a venting area 620 are defined between the battery module 2 and the housing 600. The potting area 610 and the venting area 620 are separated by a base plate 110. The potting layer is located in the potting area 610, sealing the battery compartment 121 on the side away from the base plate 110 along the z-direction, and on the opposite sides of the battery compartment 121 along the y-direction. The x-direction, y-direction, and z-direction are arranged intersecting in pairs, specifically, the x-direction, y-direction, and z-direction are arranged perpendicularly in pairs. The sealant strip 700 is located between the base plate 110 and the housing 600. The electrode tabs pass through the potting layer and connect to the electrical components 800.

[0074] Specifically, the housing 600 includes a top cover 640 and a box 630, which are connected. The battery module 2 is installed inside the box 630. The top cover 640 may contain a circuit structure. There is a gap between the battery module 2 and the inner wall of the box 630, so that glue can be injected in the potting area 610. The glue fills the space between the battery module 2 and the inner wall of the box 630 to form a potting layer. The glue may be, but is not limited to, a two-component epoxy resin, which has flame-retardant and heat-insulating functions, improves the thermal protection effect, and provides a buffer when the battery pack 1 is subjected to a side impact. The potting layer can also prevent the gas generated by the cell 200 from rushing out of the battery compartment 121 from other directions, ensuring that the gas from the cell 200 production line mainly rushes out of the battery compartment 121 through the exhaust channel 113.

[0075] In addition, a portion of the exhaust zone 620 is located inside the housing 630, while another portion of the exhaust zone 620 is constructed within the upper cover 640. Within the upper cover 640, the exhaust zone 620 is separated from the circuit structure inside the upper cover 640. That is, the exhaust zone 620 is constructed as a separate space within the upper cover 640, preventing the high-temperature gas in the exhaust zone 620 from contacting the circuit structure inside the upper cover 640, thus achieving thermoelectric separation.

[0076] By setting up the exhaust zone 620, if any cell 200 experiences thermal runaway and generates high-temperature gas, the high-temperature gas will break through the weak part 320 corresponding to its battery compartment 121. The high-temperature gas will flow into the exhaust zone 620 from the exhaust channel 113 connected to its battery compartment 121, thus avoiding local heat accumulation.

[0077] By setting the adhesive baffle 700, the gap between the base plate 110 and the housing 600 can be sealed, isolating the glue-filling area 610 and the venting area 620, preventing the glue from entering the venting area 620, and ensuring the smooth diffusion of high-temperature gas within the venting area 620. The adhesive baffle 700 may include a composite rubber material and is designed to block the glue.

[0078] Furthermore, such as Figure 3 As shown, the housing 600 is provided with an exhaust port 641, which is connected to the exhaust area 620. The battery pack 1 also includes an explosion-proof valve, which is connected to the housing 600 and seals the exhaust port 641. The exhaust port 641 can be located on the side of the top cover 640 facing away from the housing 630.

[0079] In other words, the potting area 610 and the venting area 620 are separated by the base plate 110. The potting area 610 is not wrapped around the battery module 2, but is set on opposite sides of the battery module 2 in the y direction and on the end of the battery module 2 away from the base plate 110 in the z direction. The side of the battery module 2 facing the top cover in the x direction is not potted. The venting port 641 is connected to the venting area 620.

[0080] Suppose that any one of the battery cells 200 experiences thermal runaway, generating high-temperature gas. This high-temperature gas will break through the weak point 320 of the battery compartment 121 where it is located. The high-temperature gas flows into the exhaust zone 620 through the exhaust channel 113 connected to the battery compartment 121. When the high-temperature gas in the exhaust zone 620 accumulates to a certain level and the explosion-proof valve reaches a certain pressure, the high-temperature gas is discharged from the explosion-proof valve. This prevents the pressure in the exhaust zone 620 from becoming too high and causing the high-temperature gas to rush into other battery compartments 121, thereby improving the thermal protection of the battery pack 1 and enhancing its safety.

[0081] Furthermore, the battery pack 1 also includes a flame-retardant structure located within the exhaust zone 620 and bonded to the inner wall of the housing 600. The flame-retardant structure may include mica paper, which is a functional material made from phlogopite or muscovite through pulping and papermaking. It possesses extremely high fire resistance and can physically isolate fire.

[0082] By setting a flame-retardant structure, it is possible to prevent high-temperature gases from damaging the structure of the housing 600 around the exhaust zone 620, thereby reducing the probability of damage to the housing 600.

[0083] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, Includes a battery module (2), said battery module (2) comprising: An exhaust liquid cooling assembly (100) includes a base plate (110) and a plurality of liquid cooling plates (120). The base plate (110) has a first side surface (111) and a second side surface (112) arranged opposite to each other along the z direction. The plurality of liquid cooling plates (120) are all connected to the first side surface (111) and are arranged sequentially at intervals along the x direction. The x direction and the z direction intersect. Two adjacent liquid cooling plates (120) and the base plate (110) together define a battery compartment (121). The base plate (110) is provided with a plurality of exhaust channels (113). The plurality of battery compartments (121) and the plurality of exhaust channels (113) are connected one-to-one. Multiple battery cells (200) are disposed in multiple battery compartments (121); A flame-retardant sealing sheet (300) is disposed on the second side (112) and includes a plurality of weak parts (320), wherein the plurality of weak parts (320) are provided in a one-to-one correspondence with the plurality of exhaust channels (113).

2. The battery pack according to claim 1, characterized in that, The flame-retardant sealant (300) also includes: Main body (310); Multiple tear-resistant connecting parts (330) are connected one-to-one with multiple weak parts (320). The tear-resistant connecting parts (330) are connected between the main body (310) and the corresponding weak parts (320) and surround the corresponding weak parts (320). The projection of the weak parts (320) on the base plate (110) at least partially overlaps with the corresponding exhaust channel (113).

3. The battery pack according to claim 2, characterized in that, The projection of the weak part (320) on the base plate (110) covers the corresponding exhaust channel (113).

4. The battery pack according to claim 1, characterized in that, The battery pack also includes: A housing (600) is provided on the outside of the battery module (2), and an encapsulation area (610) and an venting area (620) are formed between the battery module (2) and the housing (600), and the encapsulation area (610) and the venting area (620) are separated by the base plate (110); A potting layer is provided in the potting area (610). The potting layer seals the side of the battery compartment (121) away from the bottom plate (110) along the z direction, and the opposite sides of the battery compartment (121) along the y direction. The x direction, y direction and z direction are intersected in pairs. A rubber-blocking strip (700) is disposed between the base plate (110) and the housing (600).

5. The battery pack according to claim 4, characterized in that, The housing (600) is provided with an exhaust port (641), which is connected to the exhaust area (620). The battery pack (1) also includes an explosion-proof valve, which is connected to the housing (600) and covers the exhaust port (641). And / or, the battery pack (1) further includes a flame-retardant structure located within the exhaust zone (620) and in contact with the inner wall of the housing (600).

6. The battery pack according to claim 4, characterized in that, The battery cell includes a battery cell body and a tab. The battery cell body and the tab are connected. The base plate and the tab are located on opposite sides of the battery cell body along the z-direction. The tab passes through the potting layer.

7. The battery pack according to claim 1, characterized in that, Also includes: A flame-retardant heat insulation component (400) is disposed inside the battery compartment (121) and located on one side of the battery cell (200) along the x direction. The side of the battery cell (200) facing away from the flame-retardant heat insulation component (400) is connected to the liquid cooling plate (120). The flame-retardant heat insulation component (400) is disposed between the battery cells of two adjacent battery compartments (121).

8. The battery pack according to claim 7, characterized in that, The battery pack also includes: An elastic element (500) is disposed in the battery compartment (121), and the elastic element (500) and the flame-retardant heat insulation element (400) are located on the same side of the battery cell (200) along the x-direction.

9. The battery pack according to claim 8, characterized in that, The flame-retardant heat insulation component (400) includes a heat insulation layer (410) and a flame-retardant layer (420), and the elastic component (500) is located between the heat insulation layer (410) and the flame-retardant layer (420).

10. The battery pack according to any one of claims 1-9, characterized in that, The base plate (110) is provided with a main liquid channel (114), and the two ends of the main liquid channel (114) penetrate through the circumference of the base plate (110) to form a liquid inlet (114c) and a liquid outlet (114d). Each liquid cooling plate (120) is provided with a distribution channel (122), and multiple distribution channels (122) are connected to the main liquid channel (114).

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