Battery pack

Abstract

The utility model provides a kind of battery pack, comprising: box body, inside is defined with multiple subspaces, each sub-space top is equipped with the gas-collecting member corresponding with the position of sub-space respectively, gas-collecting member is equipped with gas-collecting passage, the first flue is equipped in the second direction in box body inside one side, the second flue is equipped in the other side of second direction in box body inside, multiple gas-collecting members are located between the first flue and the second flue, wherein, in any two adjacent gas-collecting members, one gas-collecting member is communicated with the first flue, another gas-collecting member is communicated with the second flue;Multiple battery cells;Multiple first flow guide cover, with multiple battery cells one-to-one correspondence is arranged in gas-collecting member, first flow guide cover covers explosion-proof valve, to guide the gas in battery cell to gas-collecting passage when explosion-proof valve opens.The battery pack according to the utility model embodiment can realize the partition collection of odd row and even row battery cell jet, avoid airflow intersection;And can simplify exhaust path, reduce airflow congestion and leakage.

Description

Technical Field

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

[0002] Layered oxide sodium-ion batteries (low cost, abundant resources), lithium iron phosphate batteries (high safety, long cycle life), and ternary lithium-ion batteries (high energy density) are currently the mainstream battery systems in the fields of energy storage and new energy vehicles. All three often use square cells to form multi-series battery packs (e.g., a 1P48S structure with a size of 203mm×54mm×173mm). The explosion-proof valves, terminals, and aluminum bars on the top of the square cells are densely distributed, and the jetting characteristics of different battery systems during thermal runaway share common risks: high-temperature flammable gases (sodium-ion batteries and ternary batteries contain hydrocarbons, carbon monoxide, etc., while lithium iron phosphate batteries contain hydrogen and alkanes) are easily ignited. If they directly contact the explosion-proof valves or terminals of adjacent cells, they will quickly cause heat spread, leading to the failure of the entire pack.

[0003] In the existing technology, aerogel is often used to cover the top or a single exhaust channel to collect the jets, but there are the following defects: (1) The single exhaust channel has a long path and a fixed cross-section, which is prone to jet leakage due to local airflow congestion; (2) The exhaust path of the battery cell is not distinguished, and the jets of adjacent battery cells converge in the channel, which still poses a risk of ignition; (3) The exhaust channel has poor compatibility with aluminum bars and poles, which can easily interfere with electrical connections.

[0004] Therefore, there is an urgent need for a top protection structure that can guide exhaust in sections, adapt to the arrangement of battery cells, and be compatible with electrical connections. Utility Model Content

[0005] One objective of this invention is to provide a battery pack that can at least solve the technical problem of difficulty in achieving zoned guided exhaust in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] A battery pack according to a first aspect of the present invention includes: a housing body, wherein a plurality of sub-spaces spaced apart along a first direction are defined within the housing body, and a gas collecting element corresponding to the position of the sub-space is provided above each of the sub-spaces. Each gas collecting element has a gas collecting channel within it. A first fire channel is provided on one side of the housing body in a second direction, and a second fire channel is provided on the other side of the housing body in the second direction. The plurality of gas collecting elements are respectively located between the first fire channel and the second fire channel, wherein in any two adjacent gas collecting elements, one gas collecting element is connected to the first fire channel, and the other gas collecting element is connected to the second fire channel; a plurality of battery cells, each battery cell being disposed within a corresponding sub-space, and each battery cell having an explosion-proof valve at its top; and a plurality of first flow guides, each first flow guide corresponding to one of the battery cells and disposed on the gas collecting elements, the first flow guides covering the explosion-proof valves to guide gas within the battery cells to the gas collecting channel when the explosion-proof valves are opened.

[0008] Optionally, the first flow guide is offset from the terminal post at the top of the battery cell, and the distance between the first flow guide and the terminal post is not less than 3 mm; and / or, one end of the first flow guide is fixedly connected to the gas collecting component; and / or, the other end of the first flow guide is sealed to the outer surface of the top of the battery cell through a sealing gasket; and / or, the first flow guide includes a cover body and a connecting pipe communicating with one end of the cover body, and the radial dimension of the cover body gradually decreases along the direction from the top of the battery cell to the gas collecting component; and / or, the first flow guide is a polyhexamethylene adipamide resin component with 30% glass fiber added by weight.

[0009] Optionally, multiple subspaces are distributed in the second direction, and the multiple gas collecting elements in the second direction are interconnected.

[0010] Optionally, the battery pack further includes: a second air deflector, one end of which is connected to the gas collection channel, and the other end of which is connected to the first fire channel or the second fire channel.

[0011] Optionally, a one-way valve may be provided between the first or second fire channel and the gas collection channel.

[0012] Optionally, the inner walls of the first fire channel and / or the second fire channel are provided with a heat insulation layer; and / or, the area on the outer surface of the housing body corresponding to the first fire channel and / or the second fire channel is wrapped with a heat insulation layer; and / or, a heat insulation layer is filled between adjacent battery cells.

[0013] Optionally, the exhaust ports of the first fire channel and / or the second fire channel that connect to the outside are equipped with one-way exhaust valves.

[0014] Optionally, the opening pressure of the one-way exhaust valve is not greater than 10 kPa, and the closing pressure is not less than 2 kPa; and / or, the exhaust direction of the one-way exhaust valve is obliquely upward at 45°.

[0015] Optionally, the exhaust ports of the first and / or second fire channels that connect to the outside are equipped with stainless steel flame-retardant mesh.

[0016] Optionally, the distance between the bottom of the first fire channel and the second fire channel and the top of the battery cell is not less than 5 mm.

[0017] According to the battery pack of this utility model embodiment, by adopting a technical solution in which one of any two adjacent gas collecting components is connected to the first fire channel and the other gas collecting component is connected to the second fire channel, it can not only achieve the partitioned collection of gas jets from odd-numbered and even-numbered rows of battery cells, avoiding airflow convergence; but also simplify the exhaust path, reduce airflow congestion and leakage; and when adopting a technical solution of multiple battery cells connected in series, it can be adapted to the aluminum bar series structure to ensure that the electrical connection is not affected.

[0018] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0020] Figure 1 This is a top perspective view of a battery pack according to an embodiment of the present invention; Figure 2 This is a side view of a battery pack according to an embodiment of the present invention.

[0021] Attached icon number Battery pack 100; 10. Box body; 11. Gas collection component; 12. Gas collection channel; 13. First fire channel; 14. Second fire channel; 15. Fire channel exhaust port; 20. Battery cell; 21. Explosion-proof valve; 22. Terminal post; 23. Aluminum busbar; 24. Protective mica plate; 25. Integrated busbar; First flow guide shroud 30; shroud body 31; connecting pipe 32; One-way valve 40; 51. Thermal insulation material; 52. Battery pack power distribution management unit. Detailed Implementation

[0022] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0023] The terms "first" and "second" in the specification and claims of this utility model may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "multiple" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0024] In the description of this utility model, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", 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.

[0025] 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 based on the specific circumstances.

[0026] like Figure 1 and Figure 2 As shown, the battery pack 100 according to an embodiment of the present utility model includes: a box body 10, a plurality of battery cells 20 and a plurality of first air guides 30.

[0027] Specifically, the housing body 10 defines multiple sub-spaces spaced apart along a first direction. Each sub-space is equipped with a gas collecting component 11 corresponding to its position. The gas collecting component 11 has a gas collecting channel 12. The housing body 10 has a first fire channel 13 on one side of a second direction and a second fire channel 14 on the other side of the second direction. The multiple gas collecting components 11 are located between the first fire channel 13 and the second fire channel 14. In any two adjacent gas collecting components 11, one gas collecting component 11 is connected to the first fire channel 13 and the other gas collecting component 11 is connected to the second fire channel 14. Each battery cell 20 is disposed in a corresponding sub-space. Each battery cell 20 has an explosion-proof valve 21 on its top. Multiple first flow guides 30 are disposed on the gas collecting components 11 in a one-to-one correspondence with the multiple battery cells 20. The first flow guides 30 cover the explosion-proof valves 21 so that when the explosion-proof valves 21 are opened, the gas in the battery cell 20 is guided to the gas collecting channel 12.

[0028] In other words, the battery pack 100 according to the present utility model embodiment adopts a combination of a box body 10, a plurality of battery cells 20 and a plurality of first air guides 30.

[0029] The internal space of the housing 10 includes multiple sub-spaces, each of which can be used to install battery cells 20. These sub-spaces are spaced apart in a first direction, meaning that multiple battery cells 20 are also spaced apart in the first direction. A gas collecting element 11 is provided above each sub-space; "above" here refers to the side opposite the explosion-proof valve 21 of the battery cell 20. A first air guide shroud 30 can be provided between the gas collecting element 11 and the battery cell 20. Multiple first air guide shrouds 30 can be provided, with each first air guide shroud 30 corresponding to a specific battery cell 20, and the first air guide shrouds 30 can be mounted on the gas collecting element 11. The air inlet end of the first air guide shroud 30 can cover the explosion-proof valve 21, allowing gas inside the battery cell 20 to enter the gas collecting element 11 along the first air guide shroud 30 when the explosion-proof valve 21 is open. In other words, the gas collecting component 14 is located above the top of the battery cell 20. A first flow guide shroud 30 is provided between the gas collecting component 14 and the explosion-proof valve 21 at the top of the battery cell 20. One end of the first flow guide shroud 30 can be connected to the gas collecting component 14, and the other end can be connected to the top of the battery cell 20. When the explosion-proof valve 21 of the battery cell 20 is opened, the internal gas of the battery cell 20 can pass through the first flow guide shroud 30 and enter the gas collecting component 14.

[0030] Furthermore, the first flow guide shroud 30 covers the explosion-proof valve 21, meaning the cross-sectional area of ​​the portion of the first flow guide shroud 30 that connects to the top of the battery cell 20 is not less than the cross-sectional area of ​​the explosion-proof valve 21. In other words, the flow guide port of the first flow guide shroud 30 is connected to the explosion-proof valve 21, and the cross-sectional area of ​​the flow guide port of the first flow guide shroud 30 is not less than the cross-sectional area of ​​the explosion-proof valve. For example, the cross-sectional area of ​​the flow guide port of the first flow guide shroud 30 is ≥3.5*2.3cm². In this embodiment, by ensuring that the cross-sectional area of ​​the other end of the first flow guide shroud 30 is not less than the cross-sectional area of ​​the explosion-proof valve 21, the other end of the first flow guide shroud 30 can completely cover the explosion-proof valve 21, facilitating the rapid and directional outflow of gas from the battery cell 20.

[0031] Furthermore, each of the multiple first flow guide shrouds 30 corresponds one-to-one with a multiple battery cell 20. That is, one battery cell 20 can correspond to one first flow guide shroud 30. One end of each first flow guide shroud 30 is connected to the gas collecting component 14, and the other end of the first flow guide shroud 30 covers the explosion-proof valve 21 area of ​​one battery cell 20. In this embodiment, by using the first flow guide shroud 30, it can play a guiding role, which is conducive to achieving directional exhaust. By configuring each battery cell 20 with an independent first flow guide shroud 30, it is possible to prevent one battery cell 20 from interfering with adjacent battery cells 20 when it experiences thermal runaway.

[0032] Furthermore, the internal space of the casing 10 has a first fire channel 13 on one side in the second direction, and a second fire channel 14 on the other side in the second direction. For example, when the number of sub-spaces is one column, the first fire channel 13 is provided on one side of the sub-space in the second direction, and the second fire channel 14 is provided on the other side of the sub-space in the second direction. As another example, when the number of sub-spaces is N columns, the first fire channel 13 and the second fire channel 14 are respectively provided on the outer sides of the first column and the Nth column of the battery cells 20 in the second direction, which will not be elaborated further here. The second direction can be the width direction of the battery pack 100, the first direction can be the length direction of the battery pack 100, and the first fire channel 13 and the second fire channel 14 can extend along the length direction of the battery pack 100.

[0033] It is understood that in any two adjacent gas collecting elements 11, one gas collecting element 11 is connected to the first fire channel 13, and the other gas collecting element 11 is connected to the second fire channel 14. For ease of explanation, the multiple rows of gas collecting elements 14 in the first direction are divided into odd-numbered rows of gas collecting elements 14 and even-numbered rows of gas collecting elements 14. The first fire channel 13 can be connected to the odd-numbered rows of gas collecting elements 14 in the first direction; the second fire channel 14 can be connected to the even-numbered rows of gas collecting elements 14 in the first direction. That is, a portion of the gas inside the battery cell 20 enters the first fire channel 13 through a portion of the gas collecting elements 14, and another portion of the gas inside the battery cell 20 enters the second fire channel 14 through the other portion of the gas collecting elements 14. Furthermore, the first fire channel 13 is isolated from the even-numbered rows of gas collecting elements 14 in the first direction, and the second fire channel 14 is isolated from the odd-numbered rows of gas collecting elements 14 in the first direction. In other words, the gas in the odd-numbered row gas collectors 14 enters the first fire channel 13, and the gas in the even-numbered row gas collectors 14 enters the second fire channel 14. That is, the first fire channel 13 and the second fire channel 14 can collect the gas jets from the odd-numbered row cells 20 and the even-numbered row cells 20 respectively. This helps to solve the technical problem that when the battery pack 100 experiences thermal runaway, the explosion-proof valve 21 on the top of one cell 20 will ignite the gas jet from the adjacent cell 20.

[0034] Furthermore, multiple battery cells 20 can be connected in series, but not limited to this connection. Optionally, the battery cells 20 can be layered oxide sodium-ion cells, lithium iron phosphate cells, or ternary lithium-ion cells, etc.

[0035] Therefore, the battery pack 100 according to the present utility model, by adopting the technical solution that in any two adjacent gas collecting members 11, one gas collecting member 11 is connected to the first fire channel 13 and the other gas collecting member 11 is connected to the second fire channel 14, can not only realize the partitioned collection of gas jets from odd-numbered rows and even-numbered rows of battery cells 20, avoiding airflow convergence; but also simplify the exhaust path, reduce airflow congestion and leakage; and when adopting the technical solution of multiple battery cells 20 connected in series, it can be adapted to the aluminum bar series structure to ensure that the electrical connection is not affected.

[0036] In some specific embodiments of this utility model, the first deflector 30 can satisfy at least one of the following conditions: (1) The first flow guide 30 is offset from the top pole 22 of the battery cell 20, and the distance between the first flow guide 30 and the pole 22 is not less than 3mm; that is, the first flow guide 30 can avoid the positive and negative poles 22, improve safety, and the distance between the flow guide port of the first flow guide 30 and the pole 22 of the adjacent battery cell 20 is ≥3mm, which can effectively avoid interference with the aluminum bar connection.

[0037] (2) One end of the first flow guide 30 is fixedly connected to the gas collecting component 11; the flow outlet of the first flow guide 30 of a single battery cell 20 is fixedly connected to the gas collecting component 14, which can prevent the first flow guide 30 from falling off due to gas impact.

[0038] (3) The other end of the first guide shroud 30 is sealed to the outer surface of the top of the battery cell 20 by a sealing gasket, which can improve the gas collection efficiency. Optionally, a sealing gasket is pasted on the bottom edge of the first guide shroud 30. For example, a 1mm thick high-temperature resistant silicone rubber sealing gasket (temperature resistance ≥300℃) can be used to seal to the non-terminal area of ​​the top of the battery cell 20.

[0039] (4) The first air guide shroud 30 includes a shroud 31 and a connecting pipe 32 connected to one end of the shroud 31. Along the direction from the top of the battery cell 20 towards the gas collecting component 11, the radial dimension of the shroud 31 gradually decreases, enabling the collection, acceleration, and pressurization of airflow while ensuring the stability of the air intake. This allows for precise airflow output in scenarios requiring high speed or high pressure, improving the directional efficiency of the air guiding system. Furthermore, by using the shroud 31 and the connecting pipe 32 in combination, it can extend towards the explosion-proof valve location, preventing interference between protruding structures such as the pole post 22 and the gas collecting component 11. For example, as... Figure 2 As shown, an aluminum busbar 23 is provided above the pole post 22. A protective mica plate 24 and an integrated busbar 25 are also provided on one side of the aluminum busbar 23. The cover 31 and the connecting pipe 32 are used in combination to avoid the above structure and correspond to the explosion-proof valve 21.

[0040] (5) The first air guide 30 is made of a high-temperature resistant material. Optionally, the first air guide 30 is a polyhexamethylene adipamide resin part with 30% glass fiber added by weight, that is, PA66+GF30, which has a temperature resistance of not less than 300℃ and UL94 V0 level. In other words, using a polyhexamethylene adipamide resin part with 30% glass fiber added as the first air guide 30 can avoid heat deformation that would affect gas flow.

[0041] According to one embodiment of the present invention, multiple subspaces are distributed in a second direction, and the multiple gas collecting components 11 in the second direction are interconnected. For ease of explanation, the number of subspaces in the second direction can be defined as columns. For example, multiple subspaces are arranged in an array along the first and second directions, with x columns in the second direction and y rows in the first direction, and one battery cell 20 can be installed in each subspace. For example, the shape of the housing body 10 is square, and the shape of the battery cell 20 is also square. In the width direction of the battery pack 100, the battery cells 20 can be arranged in x columns; in the length direction of the battery pack 100, the battery cells 20 can be arranged in y rows. That is, multiple battery cells 20 are arranged in x columns and y rows. Optionally, when the number of battery cells 20 in each row is the same, the total number of battery cells 20 can be x*y. It is understood that since the multiple gas collecting components 11 in the second direction are interconnected, the outermost gas collecting component 11 in the second direction is connected to the first fire channel 13 or the second fire channel 14, that is, the entire column of gas collecting components 11 is connected to the first fire channel 13 or the second fire channel 14.

[0042] According to one embodiment of this utility model, the battery pack 100 further includes a second air guide shroud, one end of which is connected to the gas collection channel 12, and the other end of which is connected to the first fire channel 13 or the second fire channel 14. That is, a portion of the second air guide shroud guides the gas in the odd-numbered rows of gas collection members 14 to the first fire channel 13, and another portion of the second air guide shroud guides the gas in the even-numbered rows of gas collection members 14 to the second fire channel 14. In this embodiment, the second air guide shroud serves a guiding function. Similarly, the shape of the second air guide shroud can be the same as that of the first air guide shroud 30, also including a shroud body 31 and a connecting pipe 32 connected to one end of the shroud body 31. The area connected to the gas collection member 14 is relatively large, achieving airflow convergence, acceleration, and pressurization, while ensuring the stability of the intake air.

[0043] Optionally, the first fire channel 13 has multiple air inlets on its side. One end of a portion of the second guide shroud is connected to a gas collecting component 14, and the other end is connected to an air inlet. Similarly, the second fire channel 14 can also have multiple air inlets on its side. Another portion of the second guide shroud has one end connected to a gas collecting component 14, and the other end is connected to an air inlet. That is, the first fire channel 13 and the second fire channel 14 each have y / 2 air inlets on their sides. In this embodiment, by using a one-to-one correspondence between the air inlets and the gas collecting components 14, the directionality of the gas flow can be ensured. Optionally, the first fire channel 13 and the second fire channel 14 can be made of the same high-temperature resistant material as the first guide shroud 30 and the second guide shroud, such as polyhexamethylene adipamide resin with 30% glass fiber added by weight.

[0044] In some specific embodiments of this utility model, a one-way valve 40 is provided between the first fire channel 13 or the second fire channel 14 and the gas collecting channel 12. For example, a one-way valve 40 is provided between the gas inlet and the gas collecting component 14, which is beneficial to realize one-way gas flow.

[0045] Optionally, the second fairing is made of the same material as the first fairing 30, both using high-temperature resistant materials. For example, the second fairing is a polyhexamethylene adipamide resin component with 30% glass fiber added by weight, i.e., PA66+GF30, which has a temperature resistance of not less than 300℃ and UL94 V0 level, thus improving the heat resistance of the second fairing.

[0046] Optionally, a portion of the flow outlet of the second flow deflector is fixedly connected to the inner wall of the first fire channel 13; alternatively, another portion of the flow outlet of the second flow deflector is fixedly connected to the inner wall of the second fire channel 14. By fixing the second flow deflector to the first fire channel 13 or the second fire channel 14, structural stability can be improved.

[0047] According to one embodiment of the present invention, the inner wall of the first fire channel 13 and / or the second fire channel 14 is provided with a heat insulation layer, for example, wrapped with a 1mm thick aerogel felt (thermal conductivity not greater than 0.02W / (m²)). K) can provide thermal insulation. And / or, the area on the outer surface of the housing body 10 corresponding to the first fire channel 13 and / or the second fire channel 14 is wrapped with a thermal insulation layer, for example, the outer wall of the first fire channel 13 and / or the second fire channel 14 is wrapped with a 2mm thick aerogel felt, which can provide thermal insulation. And / or, a thermal insulation layer is filled between adjacent battery cells 20, for example, aerogel is used as the thermal insulation material 51. Among them, in the module thermal propagation test, when a thermal insulation material with extremely low thermal conductivity is used between the battery cells 20, the adjacent battery cells 20 are mainly ignited by the combustible gas ejected by the thermally runaway battery cells 20. Combined with the partitioned collection of gas ejected from odd-numbered rows and even-numbered rows of battery cells, the airflow convergence can be avoided, thereby inducing the adjacent battery cells 20 to be ignited by combustible gas.

[0048] In some specific embodiments of this utility model, the exhaust port 15 of the first fire channel 13 and / or the second fire channel 14 that connects to the outside has a built-in one-way exhaust valve, which is beneficial to realize one-way gas flow.

[0049] According to one embodiment of this utility model, the opening pressure of the one-way exhaust valve is not greater than 10 kPa, and the closing pressure is not less than 2 kPa; and / or, the exhaust direction of the one-way exhaust valve is obliquely upward at 45°. That is to say, the exhaust port 15 at the end of the first fire channel 13 and / or the second fire channel 14 is provided with an exhaust hole, and the exhaust hole has a built-in one-way exhaust valve. The opening pressure of the one-way exhaust valve can be not greater than 10 kPa, and the closing pressure can be not less than 2 kPa, which can improve safety. Moreover, the exhaust direction is obliquely upward at 45°, which can avoid the surrounding components of the battery pack 100.

[0050] In some specific embodiments of this utility model, the exhaust ports 15 of the first fire channel 13 and / or the second fire channel 14 that connect to the outside are equipped with stainless steel flame-retardant mesh. For example, the end of the first fire channel 13 and / or the second fire channel 14 is provided with an exhaust hole, and the exhaust hole is equipped with a stainless steel flame-retardant mesh. The pore size of the stainless steel flame-retardant mesh can be 0.5mm, and the temperature resistance is not less than 800℃, which can improve the flame-retardant effect.

[0051] According to one embodiment of the present invention, in the height direction of the battery pack 100, the distance between the bottom of the first fire channel 13 and the second fire channel 14 and the top of the cell 20 is not less than 5mm, which can avoid the inter-row jump path of the aluminum bar. In particular, when the inter-row aluminum bar of multiple cells 20 connected in series is arranged in the middle of the battery pack 100, the cells 20 can be kept away from the fire channels on both sides.

[0052] The battery pack 100 of this utility model will be described in detail below with reference to specific embodiments.

[0053] Example 1 The housing 10 has an installation space comprising 48 sub-spaces, a first fire channel 13, and a second fire channel 14, dividing the 48 sub-spaces into 3 columns and 16 rows. Specifically, the width direction of the battery pack 100 is the column direction, and the length direction is the row direction. In the column direction, 3 groups of battery cells 20 are arranged along the width direction of the battery pack 100, with a gap reserved between adjacent columns of battery cells 20 for aerogel filling. In the row direction, 16 groups of battery cells 20 are arranged along the length direction of the battery pack 100, with a gap reserved between adjacent rows of battery cells 20 for aerogel filling. Additionally, the first fire channel 13 and the second fire channel 14 are respectively located at the outermost ends of the 3 columns of battery cells 20, and a battery pack power distribution management unit 52 can be located between the first fire channel 13 and the second fire channel 14.

[0054] During assembly, 48 cells can be arranged in 3 columns × 16 rows and fixed to the battery pack housing, with a silicone thermal pad and a liquid cooling plate disposed at the bottom. A first flow guide cover 30 is installed for each cell 20. The first flow guide covers 30 corresponding to the cells 20 in odd rows communicate with the gas collection channels 12 of a part of the gas collection members 11, and the gas collection members 11 can communicate with the first flame channel 13 through the second flow guide cover. The first flow guide covers 30 corresponding to the cells 20 in even rows communicate with the gas collection channels 12 of another part of the gas collection members 11, and the gas collection members 11 can communicate with the second flame channel 14 through the second flow guide cover. When installing the first flow guide cover 30, the first flow guide cover 30 can be attached to the top of the cell 20 through a bottom sealing gasket. The sealing gasket can be a 1mm thick high-temperature resistant silicone rubber sealing gasket (temperature resistance ≥ 300°C), which is attached, sealed and fixed to the non-post area on the top of the cell 20. When installing the second flow guide cover, the ends of the first flame channel 13 and the corresponding gas collection member 11 may be welded (for example, when made of aluminum alloy) or snap-fitted (for example, when made of plastic). During the sealing test, 0.1 MPa compressed air can be introduced into the exhaust structure, and a leakage rate ≤ 5% is qualified.

[0055] In the thermal runaway simulation, the cell 20 in the 1st column and 3rd row (odd row) is triggered to experience thermal runaway, and the ejected gas is discharged through the first flow guide cover 30 corresponding to the thermally runaway cell 20 → the corresponding gas collection member 11 → the first flame channel 13. The adjacent cells 20 in the 1st column, 2nd and 4th rows (even rows) show no abnormal temperature (maximum temperature ≤ 45°C).

[0056] The battery pack 100 according to the embodiments of the present utility model includes but is not limited to the following advantages: (1) Zoned exhaust to prevent ignition: In the thermal abuse-triggered thermal propagation test, the cells 20 adjacent to the thermally runaway cell are most likely to be triggered to thermal runaway. By adopting independent bilateral paths for the ejected gas from the odd-row and even-row cells, with no airflow intersection, the risk of the ejected gas igniting adjacent cells is completely eliminated; (2) High exhaust efficiency: The gas collection member 11 is directly connected to the first flame channel 13 and the second flame channel 14 respectively through check valves, so that the ejected gas is discharged in a short time during thermal runaway without local pressure accumulation; (3) Strong adaptability: The structures of the first flow guide cover 30 and the second flow guide cover do not affect the aluminum busbar connection and cell assembly; (4) Excellent heat insulation effect: The multi-layer wrapping design of aerogel attenuates the heat transfer between adjacent cells, and the outer wall temperatures of the first flame channel 13 and the second flame channel 14 are low, avoiding baking adjacent components.

[0057] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery pack (100), characterized in that, include: The box body (10) defines a plurality of subspaces spaced apart along a first direction. Each subspace is provided with a gas collecting component (11) corresponding to the position of the subspace. The gas collecting component (11) is provided with a gas collecting channel (12). The box body (10) is provided with a first fire channel (13) on one side of a second direction and a second fire channel (14) on the other side of the second direction. The plurality of gas collecting components (11) are respectively located between the first fire channel (13) and the second fire channel (14). Among any two adjacent gas collecting components (11), one gas collecting component (11) is connected to the first fire channel (13) and the other gas collecting component (11) is connected to the second fire channel (14). Multiple battery cells (20), each battery cell (20) is respectively disposed in the corresponding subspace, and each battery cell (20) is provided with an explosion-proof valve (21) on its top. Multiple first flow guides (30) are provided on the gas collection component (11) in a one-to-one correspondence with multiple battery cells (20). The first flow guides (30) cover the explosion-proof valve (21) so as to guide the gas in the battery cell (20) to the gas collection channel (12) when the explosion-proof valve (21) is opened.

2. The battery pack (100) according to claim 1, characterized in that, The first flow guide (30) is offset from the top pole (22) of the battery cell (20), and the distance between the first flow guide (30) and the pole (22) is not less than 3mm; And / or, one end of the first flow guide (30) is fixedly connected to the gas collecting component (11); And / or, the other end of the first flow guide (30) is sealed to the outer surface of the top of the battery cell (20) by a sealing gasket; And / or, the first flow guide (30) includes a cover (31) and a connecting pipe (32) communicating with one end of the cover (31), and the radial dimension of the cover (31) gradually decreases along the direction from the top of the cell (20) toward the gas collecting member (11).

3. The battery pack (100) according to claim 1, characterized in that, The subspace is distributed in multiple ways in the second direction, and the multiple gas collecting elements (11) in the second direction are interconnected.

4. The battery pack (100) according to claim 3, characterized in that, Also includes: The second flow guide is connected at one end to the gas collection channel (12) and at the other end to the first fire channel (13) or the second fire channel (14).

5. The battery pack (100) according to claim 1, characterized in that, A one-way valve (40) is provided between the first fire channel (13) or the second fire channel (14) and the gas collection channel (12).

6. The battery pack (100) according to claim 1, characterized in that, The inner walls of the first fire channel (13) and / or the second fire channel (14) are provided with a heat insulation layer; and / or, The outer surface of the box body (10) corresponding to the area of ​​the first fire channel (13) and / or the second fire channel (14) is covered with a heat insulation layer; and / or, A heat insulation layer is filled between adjacent cells (20).

7. The battery pack (100) according to claim 1, characterized in that, The exhaust ports (15) of the first fire channel (13) and / or the second fire channel (14) that connect to the outside have built-in one-way exhaust valves.

8. The battery pack (100) according to claim 7, characterized in that, The opening pressure of the one-way exhaust valve is not greater than 10 kPa, and the closing pressure is not less than 2 kPa; and / or, The exhaust direction of the one-way exhaust valve is obliquely upward at 45°.

9. The battery pack (100) according to claim 1, characterized in that, The exhaust ports (15) of the first fire channel (13) and / or the second fire channel (14) that connect to the outside are equipped with stainless steel flame-retardant mesh.

10. The battery pack (100) according to claim 1, characterized in that, The distance between the bottom of the first fire channel (13) and the second fire channel (14) and the top of the battery cell (20) is not less than 5 mm.

Images