Battery pack

Abstract

The utility model relates to battery pack technical field discloses a kind of battery pack, comprising: battery module, battery module includes: multiple protective components, protective component includes protection part and passage part, protection part is connected with passage part along the one end of z direction, multiple protection parts are arranged along x direction interval, passage part extends along x direction, passage part has connection state and open state, passage part is connected with adjacent passage part when being in connection state, passage part is disconnected with adjacent passage part when being in open state, passage part and two protection parts connected therewith are jointly defined to form battery compartment;Multiple battery cells are separately arranged in multiple battery compartments.The battery compartment of the utility model's battery pack is independently set, and provides exhaust guide for battery compartment, can reduce the probability of heat spread, improve safety.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and 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] 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.

[0004] 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.

[0005] In related technologies, as energy density increases, the risk of thermal runaway in batteries also increases. During the initial stage of thermal runaway, some cells trigger the release of flue gas. The initial emission temperature of the flue gas is extremely high and it has high diffusivity, which can easily corrode other normal cells, causing a chain reaction and drastically increasing the damage caused by thermal runaway. Utility Model Content

[0006] In view of this, the present invention provides a battery pack to solve the problem of thermal propagation when the battery cells in the battery pack experience thermal runaway.

[0007] This utility model provides a battery pack, including: a battery module, the battery module including: multiple protective components, each protective component including a protective part and a channel part, one end of the protective part along the z-direction being connected to the channel part, the multiple protective parts being arranged at intervals along the x-direction, the multiple channel parts extending along the x-direction, each channel part having a connected state and an open state, the channel part being connected to an adjacent channel part in the connected state, and being disconnected from an adjacent channel part in the open state, the channel part and the two protective parts connected to it together defining a battery compartment; and multiple battery cells, disposed in the multiple battery compartments.

[0008] Beneficial effects: The protective section separates the battery cells in adjacent battery compartments. When a cell in one battery compartment experiences thermal runaway, the protective section prevents the heat from being transferred to adjacent battery compartments, avoiding the impact on cells in those adjacent compartments and reducing the risk of thermal propagation, thus improving safety. When a cell in a battery compartment generates gas due to operation or thermal runaway, the gas acts on the channel section, separating it from adjacent channel sections. The gas then escapes from the battery compartment, preventing gas accumulation and damage to the battery cells under high temperature or high pressure. Because the remaining channel sections remain connected to adjacent channel sections, gas will not enter other battery compartments, achieving thermal diffusion protection.

[0009] In one alternative embodiment, the protective portion includes at least two first flame-retardant layers and a heat-insulating layer disposed between the at least two first flame-retardant layers.

[0010] Beneficial effects: The first flame-retardant layer is in contact with the battery cell. When the battery cell experiences a sudden increase in local temperature or open flame due to abnormal conditions such as overcharging or short circuits, the first flame-retardant layer can initially isolate the fire, preventing the flame from affecting other battery cells in the event of thermal runaway. The heat insulation layer can isolate heat transfer. In practical applications, under conditions where the battery cell temperature rises rapidly, the temperature on the side of the heat insulation layer away from the battery cell can be controlled within a safe temperature range, thereby effectively preventing chain thermal runaway caused by heat radiation and conduction from adjacent battery cells.

[0011] In one alternative embodiment, the protective layer further includes an elastic layer disposed between the heat insulation layer and the first flame-retardant layer.

[0012] Beneficial effects: The battery cell may expand under normal operating conditions. The elastic layer can undergo elastic deformation, providing deformation space for the expansion of the battery cell, absorbing the expansion volume of the battery cell, and the elastic layer can provide pre-tightening force for the battery cell, reducing the probability of the battery cell shaking in the battery compartment, improving the positional stability of the battery cell, thereby reducing the probability of thermal runaway of the battery cell and extending the cycle life of the battery cell.

[0013] In one optional embodiment, the channel portion includes at least two second flame-retardant layers stacked together, with each of the at least two second flame-retardant layers corresponding to at least two first flame-retardant layers. The second flame-retardant layers and the corresponding first flame-retardant layers are constructed as an integral structure, and the channel portion is bonded along the z-direction to the side of the adjacent channel portion facing away from the protective portion.

[0014] Beneficial effects: By constructing the second flame-retardant layer and the first flame-retardant layer as an integral structure, the structural strength of the protective component can be improved on the one hand, and the processing difficulty of the protective component can be reduced on the other hand, thereby improving the production efficiency of the protective component.

[0015] In one optional embodiment, the battery pack further includes: a housing, in which the battery module is disposed, the battery module and the housing together defining a cavity; a baffle strip disposed between the battery module and the housing, the baffle strip dividing the cavity into a filling area and a venting area, the channel portion being located between the battery compartment and the venting area in the z-direction; and a filling layer disposed within the filling area for sealing the opposite sides of the battery compartment in the y-direction and the side of the battery compartment facing away from the channel portion in the z-direction.

[0016] Beneficial effects: The potting layer has flame-retardant and heat-insulating functions, improving thermal protection. It also provides cushioning when the battery pack is subjected to side impacts. Furthermore, the potting layer prevents gases generated by the cells from escaping the battery compartment from other directions, ensuring that the gases mainly exit through the channels. The sealant strip seals the gap between the battery module and the casing, isolating the potting area and the venting area, preventing the potting compound from entering the venting area.

[0017] 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 cavity and fits against the inner wall of the housing.

[0018] 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 valve, preventing excessive pressure in the exhaust zone from causing high-temperature gas to rush into other battery compartments, thus improving safety. The flame-retardant structure can prevent high-temperature gas from damaging the shell structure around the exhaust zone, reducing the probability of shell damage.

[0019] In one optional embodiment, the battery compartment is provided with a baffle, which is located between the battery cell and the channel portion, and the baffle is located on opposite sides of the battery compartment along the y-direction.

[0020] Beneficial effects: The sealant can prevent the adhesive from entering between the cell and the channel from the potting area, thus affecting the venting inside the battery compartment, improving the smoothness of venting from the battery compartment, and making the battery pack safer.

[0021] In one alternative embodiment, the battery compartment is provided with a support member located between the battery cell and the channel portion, and positioned between the two adhesive baffles along the y-direction.

[0022] Beneficial effects: Increased pressure in the exhaust zone will affect the other channels. At this time, the support can support the channels, prevent deformation, prevent gas in the exhaust zone from entering the other battery compartments, thereby preventing heat spread and improving safety.

[0023] In one optional embodiment, the battery pack further includes an elastic element disposed in the battery compartment, wherein the battery cell includes a main body area and a tab area, and the elastic element is fitted to the tab area.

[0024] Beneficial effects: By setting up elastic components, on the one hand, some space in the glue-filling area is occupied, which can reduce the amount of glue in the glue-filling area and reduce costs. On the other hand, during the charging and discharging of the battery cell, the tab area will undergo an "expansion-contraction" reaction. The elastic components can provide deformation space for the tab area through their own elastic deformation and absorb the expansion volume of the tab area.

[0025] In one alternative implementation, the tab region and the channel portion are located on opposite sides of the main body region along the z-direction.

[0026] Beneficial effects: The tab area and the channel section are located on opposite sides of the main body area along the z-direction. Since the gas generated by the cell diffuses out of the battery compartment through the channel section, it can effectively prevent the gas generated by the cell from diffusing to the tab area, achieve thermoelectric separation, and improve the safety of the battery pack. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is one of the structural schematic diagrams of the battery pack according to an embodiment of the present utility model;

[0029] Figure 2 This is a second schematic diagram of the battery pack structure according to an embodiment of the present utility model;

[0030] Figure 3 For along Figure 2 Sectional view of line AA in the middle;

[0031] Figure 4 This is a schematic diagram illustrating the fit between the battery module and the housing according to an embodiment of the present utility model;

[0032] Figure 5 This is a schematic diagram illustrating the cooperation between the battery module and the flame-retardant structure in an embodiment of this utility model;

[0033] Figure 6 This is a partial structural diagram of the battery module according to an embodiment of the present invention;

[0034] Figure 7 For along Figure 6 Sectional view of the middle BB line;

[0035] Figure 8 This is a schematic diagram showing the connection of adjacent protective components according to an embodiment of the present utility model;

[0036] Figure 9 This is an exploded view of adjacent protective components according to an embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of the battery cell structure according to an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Battery module; 2. Battery pack; 100. Protective components; 101. Battery compartment; 110. Protective part; 111. First flame-retardant layer; 112. Elastic layer; 113. Heat insulation layer; 120. Channel part; 121. Second flame-retardant layer; 200. Battery cell; 211. Adhesive baffle; 212. Support component; 220. Main body area; 230. Electrode area; 300. Housing; 310. Cavity; 311. Glue filling area; 312. Venting area; 320. Top cover; 330. Box body; 400. Adhesive baffle strip; 500. Explosion-proof valve; 600. Flame-retardant structure; 700. Elastic component; 800. Electrical components; 900. Electrode. Detailed Implementation

[0040] 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.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., 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 are not intended to 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.

[0042] In the description of this utility model, "a plurality of" means two or more. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] 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.

[0044] The following is combined with Figures 1 to 10 The following describes embodiments of the present invention.

[0045] According to an embodiment of the present invention, a battery pack 2 is provided, which includes a battery module 1.

[0046] The battery module 1 includes multiple protective components 100 and multiple battery cells 200. Each protective component 100 includes a protective part 110 and a channel part 120. One end of the protective part 110 along the z-direction is connected to the channel part 120. The multiple protective parts 110 are arranged at intervals along the x-direction. The multiple channel parts 120 extend along the x-direction. The channel part 120 has a connected state and an open state. When the channel part 120 is in the connected state, it is connected to the adjacent channel part 120. When the channel part 120 is in the open state, it is disconnected from the adjacent channel part 120. The channel part 120 and the two protective parts 110 connected to it together define a battery compartment 101. The multiple battery cells 200 are disposed in the multiple battery compartments 101.

[0047] It should be noted that the battery cell 200 is a soft-pack battery cell, and the side of the battery cell 200 facing the channel section 120 is sealed.

[0048] In this invention, the protective part 110 can separate the battery cells 200 in adjacent battery compartments 101, and each battery compartment 101 forms an independent space. When a battery cell 200 in one battery compartment 101 experiences thermal runaway, the protective part 110 can prevent the temperature from being transferred to the adjacent battery compartment 101, thus preventing the battery cell 200 in the adjacent battery compartment 101 from being affected and also experiencing thermal runaway, reducing the risk of heat spread and improving safety.

[0049] When the battery cell 200 in the battery compartment 101 operates or generates gas due to thermal runaway, the gas in the battery compartment 101 acts on the channel portion 120. The channel portion 120 separates from the adjacent channel portions 120, and the gas in the battery compartment 101 can be discharged through the channel portion 120, preventing gas accumulation in the battery compartment 101 and preventing damage to the battery cell 200 in the battery compartment 101 under high temperature or high pressure. Since the other channel portions 120 remain connected to the adjacent channel portions 120, gas will not enter the other battery compartments 101, achieving thermal diffusion protection. The protective component 100 also effectively fixes the propagation path of high temperature gas when the battery cell 200 undergoes thermal runaway, preventing arcing and other situations caused by crossfire between the tabs 900 of adjacent battery cells 200. The battery pack 2 has high safety.

[0050] In addition, generally speaking, the battery cell 200 includes a tab region 230 and a main body region 220. The tab region 230 and the main body region 220 are connected. The tab region 230 and the channel portion 120 are located on opposite sides of the main body region 220 along the z-direction. The tab region 230 can be connected to a tab 900. The tab 900 can be connected to an electrical component 800. The electrical component 800 can include a busbar and a circuit board. The electrical component 800 and the tab region 230 are located on the same side of the main body region 220 along the z-direction. That is, the electrical component 800 and the channel portion 120 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 101 through the channel portion 120, it can effectively prevent the gas generated by the battery cell 200 from diffusing to the electrical component 800 and the tab region 230, thereby achieving thermoelectric separation and improving the safety of the battery pack 2.

[0051] In some embodiments, such as Figures 2-4 As shown, the battery pack 2 also includes a housing 300, a sealant strip 400, and an adhesive layer.

[0052] The battery module 1 is disposed within the housing 300, and the battery module 1 and the housing 300 together define a cavity 310. A sealant strip 400 is disposed between the battery module 1 and the housing 300, dividing the cavity 310 into a potting area 311 and a venting area 312. A channel portion 120 is located in the z-direction between the battery compartment 101 and the venting area 312. A potting layer is disposed within the potting area 311 to seal the opposite sides of the battery compartment 101 in the y-direction and the side of the battery compartment 101 facing away from the channel portion 120 in the z-direction.

[0053] Specifically, the housing 300 includes a top cover 320 and a box 330, which are connected. The battery module 1 is installed inside the box 330. The top cover 320 may contain a circuit structure. A cavity 310 is formed between the battery module 1 and the inner wall of the box 330. Glue can be injected into the potting area 311. The glue fills the space between the battery module 1 and the inner wall of the box 330 to form a potting layer. The glue can be, but is not limited to, a two-component epoxy resin, which has flame-retardant and heat-insulating functions, improving the thermal protection effect. It can also provide a buffer when the battery pack 2 is subjected to a side impact. Furthermore, the potting layer can prevent the gas generated by the cell 200 from rushing out of the battery compartment 101 from other directions, ensuring that the gas generated by the cell 200 mainly rushes out of the battery compartment 101 through the channel 120.

[0054] In addition, a portion of the exhaust zone 312 is located inside the housing 330, while another portion of the exhaust zone 312 is constructed in the upper cover 320. Within the upper cover 320, the exhaust zone 312 is separated from the circuit structure inside the upper cover 320. That is, the exhaust zone 312 is constructed as a separate space within the upper cover 320, preventing the high-temperature gas in the exhaust zone 312 from contacting the circuit structure inside the upper cover 320, thus achieving thermoelectric separation.

[0055] By setting up the exhaust zone 312, if any cell 200 experiences thermal runaway and generates high-temperature gas, the high-temperature gas will break through the channel 120 of the battery compartment 101 where it is located and flow into the exhaust zone 312, thus avoiding local heat accumulation and improving exhaust efficiency.

[0056] By setting the sealant strip 400, the gap between the battery module 1 and the housing 300 can be sealed, isolating the potting area 311 and the venting area 312, preventing the adhesive from entering the venting area 312, and ensuring the smooth diffusion of high-temperature gas within the venting area 312. The sealant strip 400 may include a composite rubber material and is designed to block the adhesive.

[0057] Furthermore, such as Figure 1 As shown, the housing 300 is provided with an exhaust port, which is connected to the exhaust area 312. The battery pack 2 also includes an explosion-proof valve 500, which is connected to the housing 300 and covers the exhaust port.

[0058] Suppose that any one of the battery cells 200 experiences thermal runaway, generating high-temperature gas. This high-temperature gas will break through the channel 120 of the battery compartment 101 where it is located and flow into the exhaust zone 312. When the high-temperature gas in the exhaust zone 312 accumulates to a certain level, and the explosion-proof valve 500 reaches a certain pressure, the high-temperature gas will be discharged from the explosion-proof valve 500. This prevents the pressure in the exhaust zone 312 from becoming too high, which could cause the high-temperature gas to rush into other battery compartments 101. This can improve the thermal protection of the battery pack 2 and enhance its safety.

[0059] like Figure 5 As shown, the battery pack 2 also includes a flame-retardant structure 600, which is located within the cavity 310 and is attached to the inner wall of the housing 300. The flame-retardant structure 600 may include mica paper, which is a functional material made from phlogopite or muscovite through pulping and papermaking. It has an extremely high fire resistance limit and can play a role in physically isolating fire.

[0060] By setting the flame-retardant structure 600, it is possible to prevent high-temperature gas from damaging the structure of the housing 300 around the exhaust zone 312, thereby reducing the probability of damage to the housing 300.

[0061] In some embodiments, such as Figure 7 As shown, a sealant 211 is provided inside the battery compartment 101. The sealant 211 is located between the battery cell 200 and the channel portion 120, and is located on opposite sides of the battery compartment 101 along the y-direction. The sealant 211 can be bonded to the battery cell 200 with double-sided adhesive.

[0062] By setting the glue-blocking component 211, the glue can be prevented from entering between the cell 200 and the channel section 120 from the glue-filling area 311, thus affecting the venting inside the battery compartment 101, improving the smoothness of the venting from the battery compartment 101, and making the battery pack 2 safer.

[0063] Furthermore, such as Figure 7 As shown, a support member 212 is provided inside the battery compartment 101. The support member 212 is located between the battery cell 200 and the channel portion 120, and is located between two adhesive-blocking members 211 in the y-direction. The support member 212 can be made of an elastic material, and can be an elastic adhesive strip. The support member 212 can be bonded to the battery cell 200 with double-sided adhesive.

[0064] When gas is generated in the battery cell 200 within a battery compartment 101, causing excessive pressure within the battery compartment 101, the pressure acts on the channel portion 120 forming the battery compartment 101, causing the channel portion 120 to separate from the adjacent protective component 100. The gas inside the battery compartment 101 is discharged outside the battery compartment 101 and enters the exhaust zone 312, increasing the pressure in the exhaust zone 312. This pressure then acts on the remaining channel portions 120. At this time, the support member 212 can support the channel portion 120, preventing deformation of the channel portion 120 and preventing gas in the exhaust zone 312 from entering the remaining battery compartments 101, thereby preventing heat spread and improving safety.

[0065] In some embodiments, such as Figure 6 , Figure 7 and Figure 10 As shown, the battery pack 2 also includes an elastic element 700, which is disposed inside the battery compartment 101 and is fitted to the tab area 230.

[0066] Among them, the elastic component 700 can be an elastic structure such as ceramic silicone foam. Ceramic silicone foam is a functional material with silicone rubber as the base material, which is uniformly dispersed with nano-sized ceramic particles and then molded and foamed. It has high temperature resistance and flame retardant properties, which can effectively suppress the combustion reaction of the battery cell 200 and reduce the hazards caused by thermal runaway.

[0067] By setting the elastic element 700, on the one hand, it occupies part of the space in the potting area 311, which can reduce the amount of potting in the potting area 311 and reduce costs. On the other hand, during the charging and discharging process of the battery cell 200, the tab area 230 will undergo an "expansion-contraction" reaction. The elastic element 700 can provide deformation space for the tab area 230 through its own elastic deformation, absorb the expansion volume of the tab area 230, and extend the cycle life of the battery cell 200.

[0068] In some embodiments, such as Figure 8 and Figure 9 As shown, the protective part 110 includes at least two first flame-retardant layers 111 and a heat insulation layer 113 disposed between the at least two first flame-retardant layers 111.

[0069] It should be noted that the first flame-retardant layer 111, the heat insulation layer 113, and the first flame-retardant layer 111 are stacked sequentially along the x-direction, that is, the heat insulation layer 113 is sandwiched between the two first flame-retardant layers 111.

[0070] Specifically, the first flame-retardant layer 111 is in contact with the battery cell 200. When the battery cell 200 experiences a sudden increase in local temperature or open flame due to abnormal conditions such as overcharging or short circuit, the first flame-retardant layer 111 can play a role in initially isolating the fire and preventing the flame from affecting other battery cells 200 in the event of thermal runaway.

[0071] The heat insulation layer 113 can isolate heat transfer. In practical applications, when the temperature of the cell 200 rises sharply, the temperature of the side of the heat insulation layer 113 away from the cell 200 can be controlled within a safe temperature range, thereby effectively avoiding chain thermal runaway caused by thermal radiation and conduction in adjacent cells 200.

[0072] Optionally, the material of the first flame-retardant layer 111 can be, but is not limited to, mica paper, and the material of the heat insulation layer 113 can be, but is not limited to, aerogel. Among them, mica paper is a functional material made of phlogopite or muscovite through pulping and papermaking, which has an extremely high fire resistance limit and can play a role in physically isolating fire. Aerogel is a material composed of silica aerogel and glass fiber, which has an extremely low thermal conductivity and can effectively block heat conduction. In addition, mica paper and aerogel have low cost and are suitable for large-scale production and use.

[0073] Furthermore, such as Figure 8 and Figure 9 As shown, the protective part 110 also includes an elastic layer 112, which is disposed between the heat insulation layer 113 and the first flame retardant layer 111. The elastic layer 112 can be an elastic structure such as ceramic silicone foam. Ceramic silicone foam is a functional material with silicone rubber as the base material, uniformly dispersed nano-sized ceramic particles, and then molded and foamed. It has high temperature resistance and flame retardant properties, which can effectively suppress the combustion reaction of the battery cell 200 and reduce the hazards caused by thermal runaway.

[0074] For example, there can be two elastic layers 112, with the first flame-retardant layer 111, elastic layer 112, heat insulation layer 113, elastic layer 112 and the first flame-retardant layer 111 stacked sequentially along the x-direction, that is, the heat insulation layer 113 has elastic layers 112 on both sides of the x-direction; or, there can be one elastic layer 112, with the first flame-retardant layer 111, elastic layer 112, heat insulation layer 113 and the first flame-retardant layer 111 stacked sequentially along the x-direction, that is, the heat insulation layer 113 has elastic layers 112 on one side of the x-direction.

[0075] The first flame-retardant layer 111, the elastic layer 112, the heat insulation layer 113, and the first flame-retardant layer 111 can be bonded together with double-sided adhesive.

[0076] The battery cell 200 may expand under normal operating conditions. The elastic layer 112 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 101, improving the positional stability of the battery cell 200, thereby reducing the probability of thermal runaway of the battery cell 200 and extending the cycle life of the battery cell 200.

[0077] Furthermore, such as Figure 8 and Figure 9 As shown, the channel portion 120 includes at least two second flame-retardant layers 121 stacked together. The at least two second flame-retardant layers 121 and at least two first flame-retardant layers 111 are connected in a one-to-one correspondence. The second flame-retardant layers 121 and the first flame-retardant layers 111 are constructed as an integral structure. The channel portion 120 is bonded along the z-direction to the side of the adjacent channel portion 120 facing away from the protective portion 110. The channel portion 120 can be bonded to the adjacent channel portion 120 using double-sided adhesive. The second flame-retardant layer 121 may also include mica paper. Multiple second flame-retardant layers 121 are stacked along the z-direction, and adjacent second flame-retardant layers 121 are bonded together.

[0078] By constructing the second flame-retardant layer 121 and the first flame-retardant layer 111 as an integral structure, the structural strength of the protective component 100 can be improved on the one hand, and the processing difficulty of the protective component 100 can be reduced on the other hand, thereby improving the production efficiency of the protective component 100.

[0079] Specifically, the projections of the channel section 120 and the battery compartment 101 defined by the adjacent channel section 120 in the z direction may not coincide. This ensures smooth exhaust flow, increases the connection area of ​​the adjacent channel sections 120, prevents the battery compartment 101 from being accidentally opened, reduces the connection difficulty between the adjacent channel sections 120, and improves production efficiency.

[0080] 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, include: Battery module (1), the battery module (1) comprising: Multiple protective components (100) are provided, each including a protective portion (110) and a channel portion (120). One end of the protective portion (110) along the z-direction is connected to the channel portion (120). The multiple protective portions (110) are spaced apart along the x-direction. The channel portion (120) extends along the x-direction. The channel portion (120) has a connected state and an open state. When the channel portion (120) is in the connected state, it is connected to the adjacent channel portion (120). When the channel portion (120) is in the open state, it is disconnected from the adjacent channel portion (120). The channel portion (120) and the two protective portions (110) connected thereto together define a battery compartment (101). Multiple battery cells (200) are disposed in multiple battery compartments (101).

2. The battery pack according to claim 1, characterized in that, The protective part (110) includes at least two first flame-retardant layers (111) and a heat insulation layer (113) disposed between the at least two first flame-retardant layers (111).

3. The battery pack according to claim 2, characterized in that, The protective part (110) further includes an elastic layer (112), which is disposed between the heat insulation layer (113) and the first flame retardant layer (111).

4. The battery pack according to claim 2, characterized in that, The channel portion (120) includes at least two second flame-retardant layers (121) stacked together. The at least two second flame-retardant layers (121) are connected one-to-one with at least two first flame-retardant layers (111). The second flame-retardant layers (121) and the corresponding first flame-retardant layers (111) are constructed as an integral structure. The channel portion (120) is bonded along the z-direction to the side of the adjacent channel portion (120) facing away from the protective portion (110).

5. The battery pack according to any one of claims 1-4, characterized in that, Also includes: The housing (300) contains the battery module (1) disposed within the housing (300), and the battery module (1) and the housing (300) together define a cavity (310). A seal strip (400) is disposed between the battery module (1) and the housing (300). The seal strip (400) divides the cavity (310) into a potting area (311) and a venting area (312). The channel portion (120) is located in the z direction between the battery compartment (101) and the venting area (312). An adhesive layer is disposed within the adhesive filling area (311) for sealing the opposite sides of the battery compartment (101) in the y direction and the side of the battery compartment (101) facing away from the channel portion (120) in the z direction.

6. The battery pack according to claim 5, characterized in that, The housing (300) is provided with an exhaust port, which is connected to the exhaust area (312). The battery pack (2) also includes an explosion-proof valve (500), which is connected to the housing (300) and covers the exhaust port. And / or, the battery pack (2) further includes a flame-retardant structure (600) located within the cavity (310) and in contact with the inner wall of the housing (300).

7. The battery pack according to claim 5, characterized in that, The battery compartment (101) is provided with a baffle (211), which is located between the battery cell (200) and the channel portion (120). The baffle (211) is located on opposite sides of the battery compartment (101) along the y direction.

8. The battery pack according to claim 7, characterized in that, The battery compartment (101) is provided with a support member (212), which is located between the battery cell (200) and the channel portion (120), and is located between the two adhesive baffles (211) in the y direction.

9. The battery pack according to claim 5, characterized in that, Also includes: An elastic element (700) is disposed in the battery compartment (101). The battery cell (200) includes a main body area (220) and a tab area (230). The elastic element (700) is fitted to the tab area (230).

10. The battery pack according to claim 9, characterized in that, The tab region (230) and the channel portion (120) are located on opposite sides of the main body region (220) along the z-direction.

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