battery pack

Abstract

This utility model relates to the field of battery structure technology and discloses a battery pack. The battery pack includes: a cell unit, including a main body area and a tab area; a first protective structure, including a first separator and a second separator; the first separator is attached to the main body area; the second separator is attached to the first surface of the tab area; the cell unit has a first protective structure on each of its opposite sides along a first direction; and a second protective structure is disposed between two adjacent first protective structures and is attached to the second surface of the tab area. The battery pack provided by this utility model has the first protective structure and the second protective structure working together to isolate the cell units from each other in the first direction, preventing the thermal runaway of one cell unit from affecting other cell units, thus playing a role in thermal blocking and effectively avoiding chain thermal runaway caused by mutual influence between adjacent cell units.

Description

Technical Field

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

[0002] As the main power source for electric bicycles, lithium-ion batteries are increasingly favored by the market due to their safety, reliability, and high energy density.

[0003] However, during the use of lithium-ion batteries, thermal runaway of a single cell may spread to surrounding battery cells, causing a chain reaction. The smoke, fire, and explosion formed during thermal runaway directly threaten the safety of drivers, passengers, and users.

[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] 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.

[0006] 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

[0007] In view of this, the present invention provides a battery pack to solve the problem that when some cells thermally run away during battery thermal runaway, they can easily corrode other normal cells, causing a chain reaction and leading to a sharp increase in the damage caused by thermal runaway.

[0008] In a first aspect, this utility model provides a battery pack, comprising: a cell unit, including a main body area and a tab area connected together; multiple cell units are spaced apart along a first direction; a first protective structure, including a first partition and a second partition connected together; the first partition is attached to the main body area; the second partition is attached to the first surface of the tab area; the first protective structure is provided on both opposite sides of the cell unit along the first direction; and a second protective structure is disposed between two adjacent first protective structures and is attached to the second surface of the tab area.

[0009] Beneficial effects: By setting a first protective structure and a second protective structure that cooperates with the first protective structure, and by setting the first protective structure on both sides of a single cell unit along the first direction, the first protective structure is composed of a first partition and a second partition; firstly, the first partition is attached to the main body area, and the orthogonal projection of the first partition in the first direction covers the main body area, thereby achieving the function of initially isolating the main body area of ​​the cell unit; secondly, the second protective structure and the second partition are respectively attached to the tab area on both sides of the tab area along the first direction, thereby achieving the function of isolating the tab area of ​​the cell unit; furthermore, the first protective structure and the second protective structure cooperate to achieve the function of isolating the cell units from each other in the first direction, blocking thermal runaway, preventing the thermal runaway of one cell unit from affecting other cell units, playing a thermal blocking role, and effectively avoiding chain thermal runaway caused by mutual influence between adjacent cell units.

[0010] In one alternative embodiment, the first partition includes at least two first fireproof layers and a heat insulation layer disposed between the at least two first fireproof layers.

[0011] Beneficial effects: When the internal temperature of the battery cell rises sharply or an open flame is caused by abnormal conditions such as overcharging or short circuit, the first fireproof layer can play a preliminary role in isolating the fire. In addition to isolating the fire, the heat insulation layer can isolate heat transfer. In practical applications, when the temperature of the battery cell unit rises sharply, the temperature on the side of the heat insulation layer away from the battery cell unit can be controlled within a safe temperature range, thereby effectively avoiding chain thermal runaway caused by heat radiation and conduction of adjacent battery cell units.

[0012] In one alternative embodiment, the second partition includes a second fireproof layer and a first flame-retardant layer stacked together.

[0013] In one optional embodiment, the second protective structure includes a third fireproof layer, a second flame-retardant layer, and a flame-retardant block. The third fireproof layer and the second flame-retardant layer are stacked together, and the flame-retardant block is disposed on the side of the third fireproof layer away from the second flame-retardant layer. The first flame-retardant layer and the second flame-retardant layer are disposed opposite to each other, and the tab area is sandwiched between the first flame-retardant layer and the second flame-retardant layer.

[0014] Beneficial effects: The second flame-retardant layer is bonded to the first flame-retardant layer on opposite sides of the tab area along the first direction, achieving double-sided flame retardancy and preventing fire from spreading laterally from the tab area along the first direction; the flame-retardant block is placed on the side of the third fireproof layer away from the second flame-retardant layer, so that the flame-retardant block is located between the tab areas of two adjacent cell units, which prevents crossfire between two adjacent cell units; the second flame-retardant layer and the first flame-retardant layer are respectively covered with fireproof layers on the side away from the tab area, effectively preventing external fire from invading the tab area and physically isolating thermal runaway.

[0015] In one optional embodiment, the third fireproof layer is bent and extended along opposite sides of the second direction to form a flange, the flange being connected to the second fireproof layer; the second direction intersects the first direction.

[0016] In one optional embodiment, the second partition has a first notch on the side away from the first partition, and the second protective structure has a second notch on the side away from the main body area, with the first notch and the second notch being disposed opposite to each other.

[0017] Beneficial effects: Multiple first protective structures are arranged along a first direction, and multiple second protective structures are arranged along a first direction. The first and second notches on the first and second protective structures are aligned, thereby forming a channel for guiding gas flow in the first direction. This channel is directed toward the exhaust port of the battery pack to guide the high-temperature flue gas to flow in the discharge direction and prevent the flue gas from accumulating in the battery pack.

[0018] In one optional embodiment, the first protective structure further includes an intermediate plate, the two sides of which are connected to the first partition and the second partition at a predetermined angle.

[0019] In one optional embodiment, the battery cell unit has side edges on opposite sides along a second direction; the flange includes a first side plate and a second side plate, the first side plate having a first side connected to the third fireproof layer and a second side connected to the first side of the second side plate, and the first side plate and the second side plate being parallel and spaced apart; the side edge is located between the first side plate and the second side plate; the flange also includes a third side plate, the first side of the third side plate being connected to the second side of the second side plate, and the second side of the third side plate being connected to the second fireproof layer.

[0020] In one optional embodiment, the battery module further includes: a circuit board disposed on one side of the cell unit along a third direction and electrically connected to the cell unit in the tab area, the third direction intersecting the first direction and the second direction respectively; a third flame-retardant layer covering the side of the circuit board away from the cell unit; and a fourth flame-retardant layer, at least two of the fourth flame-retardant layers covering opposite sides of the cell unit along the second direction.

[0021] In one alternative embodiment, the battery pack further includes: a housing covering the outside of the battery module; and a filling layer disposed on opposite sides of the battery module along a second direction and located between the battery module and the housing. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the battery cell unit of this utility model;

[0024] Figure 2 This is a schematic diagram of the first protective structure of this utility model;

[0025] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This is a schematic diagram of the second protective structure of this utility model;

[0027] Figure 5 This utility model Figure 4 Enlarged view of point B in the middle;

[0028] Figure 6 This is a schematic diagram of the battery pack of this utility model;

[0029] Figure 7 This utility model Figure 6 Enlarged view of point C in the middle;

[0030] Figure 8 This utility model Figure 7 A schematic diagram showing the interaction between multiple battery cells and multiple battery packs;

[0031] Figure 9 This utility model Figure 8 Enlarged view of point D in the middle;

[0032] Figure 10 This is a schematic diagram showing the interaction between the circuit board and the battery cell unit of this utility model;

[0033] Figure 11 This is a schematic diagram showing the interaction between the third and fourth flame-retardant layers of this utility model and the circuit board;

[0034] Figure 12 This is a schematic diagram of the filling layer of this utility model;

[0035] Figure 13 This is a schematic diagram of the housing of this utility model.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. First protective structure; 11. First partition; 111. First fireproof layer; 112. Heat insulation layer; 12. Second partition; 121. Second fireproof layer; 122. First flame-retardant layer; 13. Intermediate plate; 14. First notch;

[0038] 2. Second protective structure; 21. Third fireproof layer; 22. Second flame-retardant layer; 23. Flanged edge; 231. First side plate; 232. Second side plate; 233. Third side plate; 24. Second notch;

[0039] 3. Flame-retardant blocks;

[0040] 4. Battery cell unit; 41. Main body area; 42. Electrode area; 43. Side;

[0041] 5. Polar ears;

[0042] 6. Circuit board;

[0043] 7. Third flame-retardant layer;

[0044] 8. Fourth flame-retardant layer;

[0045] 9. Shell; 91. Filler layer; 92. Exhaust port. Detailed Implementation

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The following is combined with Figures 1 to 13 The following describes embodiments of the present invention.

[0051] According to an embodiment of the present invention, in one aspect, a battery pack is provided, comprising: Firstly, the present invention provides a battery pack comprising: a cell unit 4, including a main body region 41 and a tab region 42 connected thereto; multiple cell units 4 are spaced apart along a first direction; a first protective structure 1, including a first partition 11 and a second partition 12 connected thereto; the first partition 11 is attached to the main body region 41; the second partition 12 is attached to the first surface of the tab region 42; the first protective structure 1 is provided on both opposite sides of the cell unit 4 along the first direction; a second protective structure 2 is disposed between two adjacent first protective structures 1 and is attached to the second surface of the tab region 42.

[0052] It should be noted that the cell unit 4 is a soft-pack cell. The cell unit 4 includes an aluminum-plastic film. The aluminum-plastic film can be folded in half or two pieces can be spliced ​​together so that the perforation of the aluminum-plastic film forms a receiving space. The electrode group is set in the receiving space. When the aluminum-plastic film is sealed along one side edge of the third direction, a part area is reserved to form the electrode tab area 42. The two sides of the aluminum-plastic film along the second direction are folded to form the side edge 43.

[0053] It should be noted that the first direction, the second direction, and the third direction are the directions shown in the attached figure, and the first direction, the second direction, and the third direction intersect each other perpendicularly.

[0054] Specifically, multiple battery cell units 4 are arranged at intervals along a first direction, and each battery cell unit 4 has a first protective structure 1 on both sides along the first direction. The first partition 11 of the first protective structure 1 is attached to the main body area 41 of the battery cell unit 4, the second partition 12 is attached to the first surface of the tab area 42 of the battery cell unit 4, and the second protective structure 2 is attached to the second surface of the tab area 42, so as to isolate adjacent battery cell units 4, and at the same time, to isolate and protect the main body area 41 and the tab area 42 of the battery cell unit 4, so as to prevent the thermal failure of some battery cells from affecting other normal battery cells.

[0055] Furthermore, in the first direction, the first protective structure 1 and the battery cell 4 are arranged alternately, that is, multiple battery cell 4 are distributed at intervals along the first direction, and the first protective structure 1 is correspondingly arranged in the interval area of ​​adjacent battery cell 4; the second protective structure 2 is arranged between adjacent first protective structures 1 and cooperates with the second partition 12 to isolate the tab area 42.

[0056] Furthermore, the first protective structure 1 is bonded to the battery cell 4 at the contact position, that is, the first partition 11 is bonded to the plate surface of the main body area 41, and the second partition 12 is bonded to the first surface of the tab area 42; the second protective structure 2 is bonded to the tab area 42 at the contact position.

[0057] In this embodiment, a first protective structure 1 and a second protective structure 2 that cooperate with the first protective structure 1 are provided. The first protective structure 1 is provided on both sides of a single battery cell 4 along the first direction. The first protective structure 1 is composed of a first partition 11 and a second partition 12. Firstly, the first partition 11 is attached to the main body area 41, and its orthogonal projection in the first direction covers the main body area 41, thus initially isolating the main body area 41 of the battery cell 4. Secondly, the second protective structure 2 and the second partition 12 are respectively attached to the tab area 42 on both sides along the first direction, thus isolating the tab area 42 of the battery cell 4. Furthermore, the first protective structure 1 and the second protective structure 2 cooperate to isolate the battery cells 4 from each other in the first direction, preventing thermal runaway and preventing one battery cell 4 from affecting other battery cells 4 after thermal runaway, effectively avoiding chain thermal runaway between adjacent battery cells 4 due to mutual influence.

[0058] Optional, combined Figure 9 As shown, since the outermost battery cell 4 has a second protective structure 2 in the tab area 42, the second partition 12 can be omitted in the first protective structure 1 at the corresponding position. Only the first partition 11 located in the main body area 41 of the battery cell 4 can be retained, or only the heat insulation layer 112 can be retained to achieve the effect of isolation and protection, saving materials.

[0059] In one alternative embodiment, the first partition 11 includes at least two first fireproof layers 111 and a heat insulation layer 112 disposed between the at least two first fireproof layers 111.

[0060] It should be noted that the structural layers of the first partition 11 are a first fireproof layer 111, a heat insulation layer 112, and another first fireproof layer 111 stacked sequentially along the first direction. That is, the heat insulation layer 112 is sandwiched between two first fireproof layers 111. It can be understood that the outer first fireproof layer 111 can also be stacked in multiple layers. The specific number of layers can be determined according to actual needs. That is, at least two first fireproof layers 111 are respectively attached to opposite sides of the heat insulation layer 112.

[0061] Specifically, the first fireproof layer 111 is in contact with the main body area 41 of the battery cell 4. When the battery cell is overcharged, short-circuited or other abnormal conditions cause a sudden increase in local temperature or open flame, the first fireproof layer 111 can play a preliminary role in isolating the fire. On the basis of isolating the fire, the heat insulation layer 112 can isolate heat transfer. In practical applications, when the temperature of the battery cell 4 rises sharply, the temperature of the side of the heat insulation layer 112 away from the battery cell 4 can be controlled within a safe temperature range, thereby effectively avoiding chain thermal runaway caused by heat radiation and conduction in adjacent battery cells 4.

[0062] Optionally, the material of the first fireproof layer 111 can be, but is not limited to, mica paper, and the material of the heat insulation layer 112 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.

[0063] In one alternative embodiment, the second partition 12 includes a second fireproof layer 121 and a first flame-retardant layer 122 stacked together.

[0064] In one optional embodiment, the second protective structure 2 includes a third fireproof layer 21, a second flame-retardant layer 22, and a flame-retardant block 3. The third fireproof layer 21 and the second flame-retardant layer 22 are stacked together, and the flame-retardant block 3 is disposed on the side of the third fireproof layer 21 away from the second flame-retardant layer 22. The first flame-retardant layer 122 and the second flame-retardant layer 22 are disposed opposite to each other, and the tab area 42 is sandwiched between the first flame-retardant layer 122 and the second flame-retardant layer 22.

[0065] Specifically, the second flame-retardant layer 22 and the first flame-retardant layer 122 are attached to each other on opposite sides of the tab area 42 along the first direction to achieve double-sided flame retardancy and prevent fire from spreading laterally from the tab area 42 along the first direction; the flame-retardant block 3 is placed on the side of the third fireproof layer 21 away from the second flame-retardant layer 22, so that the flame-retardant block 3 is located between the tab areas 42 of two adjacent battery cells 4, which can prevent crossfire between two adjacent battery cells 4; the second flame-retardant layer 22 and the first flame-retardant layer 122 are respectively covered with fireproof layers (the third fireproof layer 21 and the second fireproof layer 121) on the side away from the tab area 42, which effectively prevent external fire (after the adjacent battery cells 4 catch fire) from invading the tab area 42 and physically isolate thermal runaway.

[0066] Optionally, the materials of the first flame-retardant layer 122, the second flame-retardant layer 22, and the flame-retardant block 3 may be, but are not limited to, ceramic silicone foam, and the materials of the second fireproof layer 121 and the third fireproof layer 21 may be, but are not limited to, mica paper. 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 inhibit the combustion reaction of the battery cell 4 and reduce the hazards caused by thermal runaway.

[0067] In one optional embodiment, the third fireproof layer 21 is bent and extended along the opposite sides of the second direction to form a flange 23, the flange 23 being connected to the second fireproof layer 121, and the second direction intersecting the first direction.

[0068] Specifically, the flange 23 is formed by extending the edge layer of the third fireproof layer 21 and connecting with the second fireproof layer 121 after extension, so that the second protective structure 2 wraps around the side 43 of the electrode area 42, thereby protecting the weak position (side 43) of the edge of the battery cell 4. At the same time, the material of the flange 23 is the same as that of the third fireproof layer 21, which plays the role of isolating the edge of the electrode area 42 from fire.

[0069] In one optional embodiment, the second partition 12 is provided with a first notch 14 on the side away from the first partition 11, and the second protective structure 2 is provided with a second notch 24 on the side away from the main body area 41, with the first notch 14 and the second notch 24 being arranged opposite to each other.

[0070] Specifically, multiple first protective structures 1 are arranged along a first direction, and multiple second protective structures 2 are arranged along a first direction. The first notches 14 and second notches 24 on the first protective structures 1 and the second protective structures 2 are aligned, thereby forming a channel for guiding gas flow in the first direction. This channel is set toward the exhaust port 92 of the battery pack to guide the high-temperature flue gas to flow in the discharge direction and prevent the flue gas from accumulating in the battery pack.

[0071] In one optional embodiment, the first protective structure 1 further includes an intermediate plate 13, the two sides of which are connected to the first partition 11 and the second partition 12 at a predetermined angle.

[0072] Specifically, the first side of the intermediate plate 13 is perpendicularly connected to the first partition 11, and the second side is perpendicularly connected to the second partition 12, so that the first partition 11 and the second partition 12 are staggered to adapt to the structural features of the tab area 42 and the main body area 41 in the cell unit 4. The tab area 42 is located on one side of the main body area 41 along a third direction, and the thickness of the tab area 42 (the dimension in the first direction) is less than the thickness of the main body area 41. Thus, the second partition 12 is staggered relative to the first partition 11 to ensure that the second partition 12 is in contact with the tab area 42 and the first partition 11 is in contact with the main body area 41.

[0073] In one optional embodiment, the battery cell 4 is provided with side edges 43 on opposite sides along the second direction; the flange 23 includes a first side plate 231 and a second side plate 232, the first side plate 231 is connected to the third fireproof layer 21 on a first side and connected to the first side of the second side plate 232 on a second side, and the first side plate 231 and the second side plate 232 are parallel and spaced apart; the side edge 43 is located between the first side plate 231 and the second side plate 232; the flange 23 also includes a third side plate 233, the first side of the third side plate 233 is connected to the second side of the second side plate 232, and the second side of the third side plate 233 is connected to the second fireproof layer 121.

[0074] Specifically, the first side plate 231 is perpendicularly connected to the third fireproof layer 21 on its first side, and the second side plate is bent and connected to the first side plate 231 so that the second side plate 232 is spaced apart from the first side plate 231. This spaced-apart side plate 232 is used to accommodate the side edge 43 of the tab area 42 at the interval between the first side plate 231 and the second side plate 232, so as to ensure that the flange 23 completely covers the edge of the tab area 42 and prevents the flange 23 from interfering with the edge of the tab area 42.

[0075] Specifically, the third side plate 233 is perpendicularly connected to the second side plate 232, and the third side plate 233 is also glued to the second fireproof layer 121 of the second partition 12, so that the flange 23 is wrapped around the side 43 located at the edge of the tab area 42, achieving a comprehensive heat protection effect.

[0076] In one optional embodiment, the battery module further includes a circuit board 6, which is disposed on one side of the cell unit 4 along a third direction and electrically connected to the cell unit 4 at the tab area 42. The third direction intersects with the first direction and the second direction respectively. A tab 5 is electrically connected to the cell unit 4 at one end and bends through the circuit board 6 at the other end and is disposed on the side of the circuit board 6 away from the cell unit 4. A third flame retardant layer 7 is covered on the side of the circuit board 6 away from the cell unit 4 and also covers the side of the tab 5 away from the cell unit 4. A fourth flame retardant layer 8 is provided, with at least two fourth flame retardant layers 8 covering the opposite sides of the cell unit 4 along the second direction.

[0077] Specifically, one end of the tab 5 is connected to the battery cell unit 4, and the other end passes through the circuit board 6 and is bent, so that the third flame retardant layer 7 covers the circuit board 6 and is placed on the side of the tab 5 away from the battery cell unit 4, so as to prevent high-temperature flue gas from affecting the tab 5; the fourth flame retardant layer 8 covers the opposite sides of the battery cell unit 4 along the first direction and is placed at the location of the tab area 42, so as to prevent high-temperature flue gas from corroding the battery cell unit 4 from the tab area 42.

[0078] In one optional embodiment, the battery pack further includes: a housing 9, which covers the outside of the battery module; and a filling layer 91, which is disposed on opposite sides of the battery module along a second direction and located between the battery module and the housing 9.

[0079] Specifically, the battery cell unit 4, the protective structure (first protective structure 1, second protective structure 2), and the circuit board 6 are all disposed inside the housing 9. The housing 9 has an exhaust port 92 on one side along the first direction. The battery module has gaps between its opposite sides along the second direction and the inner wall of the housing 9, so that a colloid can be injected between the battery module and the inner wall of the housing 9 along the second direction. The colloid fills the space between the battery module and the inner wall of the housing 9 to form a filling layer 91. In addition, colloid can also be injected between the side of the battery module away from the circuit board 6 along the first direction and the housing 9 to form a comprehensive protective layer. The colloid can 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 is subjected to a side impact.

[0080] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. 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 all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A battery pack, characterized by, include: Battery module, the battery module comprising: The battery cell unit (4) includes a main body area (41) and a tab area (42) connected together; multiple battery cell units (4) are spaced apart along a first direction; The first protective structure (1) includes a first partition (11) and a second partition (12) connected together; the first partition (11) is attached to the main body area (41); the second partition (12) is attached to the first surface of the electrode area (42); the first protective structure (1) is provided on both sides of the battery cell unit (4) along the first direction; The second protective structure (2) is disposed between two adjacent first protective structures (1) and is attached to the second surface of the tab region (42).

2. The battery pack according to claim 1, characterized in that, The first partition (11) includes at least two first fireproof layers (111) and a heat insulation layer (112) disposed between the at least two first fireproof layers (111).

3. The battery pack according to claim 1, characterized in that, The second partition (12) includes a second fireproof layer (121) and a first flame-retardant layer (122) stacked together.

4. The battery pack according to claim 3, characterized in that, The second protective structure (2) includes a third fireproof layer (21), a second flame-retardant layer (22) and a flame-retardant block (3). The third fireproof layer (21) and the second flame-retardant layer (22) are stacked together, and the flame-retardant block (3) is disposed on the side of the third fireproof layer (21) away from the second flame-retardant layer (22). The first flame-retardant layer (122) and the second flame-retardant layer (22) are disposed opposite to each other, and the tab area (42) is sandwiched between the first flame-retardant layer (122) and the second flame-retardant layer (22).

5. The battery pack according to claim 4, characterized in that, The edge of the third fireproof layer (21) is bent and extended on both sides along the second direction to form a flange (23), and the flange (23) is connected to the second fireproof layer (121); the second direction intersects with the first direction.

6. The battery pack according to claim 5, characterized in that, The second partition (12) has a first notch (14) on the side away from the first partition (11), and the second protective structure (2) has a second notch (24) on the side away from the main body area (41). The first notch (14) and the second notch (24) are arranged opposite to each other.

7. The battery pack according to claim 5, characterized in that, The first protective structure (1) also includes an intermediate plate (13), the two sides of which are connected to the first partition (11) and the second partition (12) at a preset angle.

8. The battery pack according to claim 5, characterized in that, The battery cell unit (4) has side edges (43) on both sides opposite each other along the second direction; The flange (23) includes a first side plate (231) and a second side plate (232). The first side plate (231) is connected to the third fireproof layer (21) on a first side and to the first side of the second side plate (232) on a second side. The first side plate (231) and the second side plate (232) are parallel and spaced apart. The side edge (43) is located between the first side plate (231) and the second side plate (232). The flange (23) also includes a third side plate (233), the first side of which is connected to the second side of the second side plate (232), and the second side of which is connected to the second fireproof layer (121).

9. The battery pack according to claim 8, characterized in that, The battery module also includes, Circuit board (6), the circuit board (6) is disposed on one side of the cell unit (4) along a third direction, and is electrically connected to the cell unit (4) in the tab area (42), the third direction intersects the first direction and the second direction respectively; A third flame-retardant layer (7) is applied to the side of the circuit board (6) away from the battery cell (4); A fourth flame retardant layer (8), at least two of the fourth flame retardant layers (8) are applied to opposite sides of the cell unit (4) along the second direction.

10. The battery pack according to claim 9, characterized in that, The battery pack also includes: Housing (9), the housing (9) being disposed on the outside of the battery module; A filling layer (91) is disposed on opposite sides of the battery module along the second direction and is located between the battery module and the housing (9).

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