Battery, electrical device, method and equipment for manufacturing a battery

Abstract

The embodiments of the present application provide a battery, an electric device, and a method and an apparatus for manufacturing the battery, the battery comprising: a battery cell including a relief mechanism, the relief mechanism being arranged to operate and release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value; a fire conduit used for containing a fire fighting medium, the fire conduit being arranged to discharge the fire fighting medium when the relief mechanism is operated; and a fixing member provided between the battery cell and the fire fighting conduit, the fixing member being arranged to fix the fire fighting conduit, the fixing member being provided with an overflow area and a flow guide structure, the overflow area covering the relief mechanism, the overflow area being arranged to allow the fire fighting medium to flow through the overflow area to the battery cell when the relief mechanism is operated, and the flow guide structure being arranged to guide the fire fighting medium to the overflow area when the relief mechanism is operated.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular to batteries, electrical devices, methods and equipment for manufacturing batteries.

Background Art

[0002] Batteries such as lithium-ion batteries have advantages such as high energy density, high power density, many cycle usage times, and long storage time, so they are generally applied to electric vehicles.

Summary of the Invention

Problems to be Solved by the Invention

[0003] However, the spontaneous combustion of batteries is the main factor causing safety accidents in electric vehicles. In order to prevent the spontaneous combustion of batteries, fire-fighting pipelines are generally installed in the conventional technology. However, batteries adopting fire-fighting pipelines still face the problem that the thermal runaway of the batteries cannot be eliminated in a timely manner.

Means for Solving the Problems

[0004] According to an aspect of an embodiment of this application, a battery is provided. A battery cell including a relief mechanism, the relief mechanism being arranged to operate when the internal pressure or temperature of the battery cell reaches a threshold value to release the internal pressure, and a fire-fighting pipeline used for accommodating a fire-fighting medium, the fire-fighting pipeline being arranged to discharge the fire-fighting medium when the relief mechanism operates, and a fixing member provided between the battery cell and the fire-fighting pipeline, the fixing member being arranged to fix the fire-fighting pipeline, including an overcurrent region and a flow guiding structure provided on the fixing member, the overcurrent region covering the relief mechanism, the overcurrent region being arranged such that when the relief mechanism operates, the fire-fighting medium passes through the overcurrent region and flows to the battery cell, and the flow guiding structure being arranged to guide the fire-fighting medium to the overcurrent region when the relief mechanism operates.

[0005] When the battery undergoes thermal runaway, the relief mechanism activates, melting the fire protection pipeline, and fire protection media such as coolant flows out from the fire protection pipeline. If the melted part of the fire protection pipeline faces the overcurrent area, the fire protection media passes through the overcurrent area and directly flows to the battery cell. When the melted part of the fire protection pipeline is on the side of the overcurrent area, or when the fire protection media ejected from the fire protection pipeline flows to the side of the overcurrent area, the diversion structure can guide the fire protection media to the overcurrent area. Therefore, by installing a diversion structure on the fixing member, more fire protection media flows to the thermal runaway part of the battery, and the diversion structure enables the fire protection media to flow more smoothly to the thermal runaway part of the battery. This improves the fire protection effect and alleviates the problem that fire protection cannot keep up during the thermal runaway process of the battery.

[0006] In some embodiments, the diversion structure and the overcurrent area are arranged along the length direction of the fire protection pipeline.

[0007] The diversion structure guides the fire protection media on the side of the overcurrent area to the overcurrent area, enabling more fire protection media to pass through the overcurrent area more smoothly and flow to the battery cell. This improves the fire protection effect and alleviates the problem that fire protection cannot keep up during the thermal runaway process of the battery.

[0008] In some embodiments, the diversion structure includes a recess. The recess is formed by being recessed along the direction towards the battery cell of the fixing member, and the recess communicates the overcurrent area with the side edge of the fixing member.

[0009] The recess reduces the obstacle to the flow of the fire protection media of the fixing member and decreases the flow resistance of the fire protection media. Thereby, more fire protection media can pass through the overcurrent area more smoothly and flow to the battery cell, improving the fire protection effect.

[0010] In some embodiments, the overcurrent area and the side edge of the fixing member are arranged along the length direction of the fire protection pipeline.

[0011] The recess communicates with the overflow region and the side edge of the fixing member, and the overflow region and the side edge of the fixing member are arranged along the longitudinal direction of the fire pipeline. That is, the recess extends along the longitudinal direction of the fire pipeline. Even if the part facing the overflow region of the fire pipeline or the part located on the side of the overflow region is melted, the fire medium discharged from the fire pipeline directly flows into the overflow region or flows into the recess. And due to the guiding action of the recess, more fire medium can be made to flow into the overflow region, improving the fire extinguishing effect.

[0012] In some embodiments, the flow guiding structure includes a reinforcing rib, and the reinforcing rib is provided at one end close to the overflow region of the recess.

[0013] By installing the reinforcing rib, the strength of the fixing member is improved.

[0014] In some embodiments, the flow guiding structure includes a notch. The notch and the overflow region are arranged along the length direction of the fire pipeline. The notch is configured to be formed by removing material from the side edge of the fixing member to the overflow region. Here, the side edge of the fixing member and the overflow region are located in the length direction of the fire pipeline.

[0015] The notch is formed by removing material from the fixing member. The flow resistance generated by the fixing member against the fire medium can be reduced, and more fire medium can flow into the overflow region more smoothly.

[0016] In some embodiments, the notch is configured as a rectangular notch or an arc-shaped notch.

[0017] The notch is formed by removing material from the fixing member. The flow resistance generated by the fixing member against the fire medium can be reduced, and more fire medium can flow into the overflow region more smoothly.

[0018] In some embodiments, flow guiding structures are provided on both sides of the overflow region along the length direction of the fire pipeline.

[0019] The concave portion extends along the length direction of the fire pipeline. Therefore, no matter which part of the fire pipeline is melted, the fire medium released from the fire pipeline directly flows into the overflow area or flows into the flow guiding structure. Then, due to the guiding action of the flow guiding structure, more fire medium flows into the overflow area, and the fire extinguishing effect can be improved.

[0020] According to another aspect of the embodiment of the present application, an electrical device is provided. The electrical device includes the above battery, and the battery is arranged to provide electrical energy.

[0021] According to another aspect of the embodiment of the present application, a method for manufacturing a battery is provided. The method includes a step of installing a battery cell, where the battery cell includes a relief mechanism, and the relief mechanism is arranged to operate to release the internal pressure when the internal pressure or temperature of the battery cell reaches a threshold value; a step of installing a fixing member; and a step of installing and fixing a fire pipeline with the fixing member, where the fire pipeline is used to accommodate a fire medium and is arranged to discharge the fire medium when the relief mechanism operates. Here, an overflow area and a flow guiding structure are provided on the fixing member. The overflow area covers the relief mechanism and is arranged such that when the relief mechanism operates, the fire medium passes through the overflow area and flows to the battery cell. The flow guiding structure is arranged to guide the fire medium to the overflow area when the relief mechanism operates.

[0022] According to another aspect of the embodiments of the present application, there is provided an apparatus for manufacturing a battery. The facility for manufacturing a battery includes a battery cell mounting device used for mounting a battery cell, where the battery cell includes a relief mechanism, and the relief mechanism is arranged to operate when the internal pressure or temperature of the battery cell reaches a threshold value to release the internal pressure; a fixing member mounting device used for mounting a fixing member; and a fire protection pipeline mounting device used for mounting a fire protection pipeline, fixing the fire protection pipeline to the fixing member, where the fire protection pipeline is used for accommodating a fire protection medium, and is arranged to discharge the fire protection medium when the relief mechanism operates. Here, an overflow area and a flow guiding structure are provided on the fixing member, the overflow area covers the relief mechanism, and when the relief mechanism operates, the fire protection medium is arranged to pass through the overflow area and flow to the battery cell, and the flow guiding structure is arranged to guide the fire protection medium to the overflow area when the relief mechanism operates.

Brief Description of the Drawings

[0023] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings necessary for the embodiments of the present application are briefly described below. It is obvious that the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the drawings without creative difficulty.

[0024]

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[0025] In the drawings, the drawings are not drawn according to the actual ratio.

Mode for Carrying Out the Invention

[0026] Hereinafter, the embodiments of the present application will be described in more detail with reference to the drawings and examples. The following detailed description of the examples and the drawings are used to exemplarily explain the principle of the present application, but do not limit the scope of the present application. That is, the present application is not limited to the described embodiments.

[0027] In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more. The indicated orientation or positional relationship such as "up", "down", "left", "right", "inside", "outside", etc. is only for facilitating the description of the present application and simplifying the description. It does not indicate or imply that the specified device or element must have a specific orientation, be configured and operated in a specific orientation. Therefore, it should not be understood as limiting the present application. Also, the terms "first", "second", "third", etc. are only used for illustrative purposes and should not be understood as indicating or implying relative importance. "Vertical" does not mean vertical in a strict sense and includes an allowable error range. "Parallel" does not mean parallel in a strict sense and includes an allowable error range.

[0028] The terms indicating directions used in the following description are all the directions shown in the figures and do not limit the specific structure of the present application. In the description of the present application, unless otherwise clearly specified and limited, the terms "attach", "communicate", and "connect" should be understood in a broad sense. For example, it may be a fixed connection, removably connected, or integrally connected, may communicate directly, or may communicate indirectly through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0029] The rechargeable battery can be called a secondary battery or a power battery. Currently, the widely used rechargeable battery is a lithium battery, for example, a lithium-sulfur battery, a sodium-lithium ion battery, or a magnesium ion battery, but is not limited thereto. For the sake of easy explanation, in the present application, the rechargeable battery may also be collectively referred to as a battery.

[0030] The safety characteristics of the battery are important characteristics for evaluating the battery, and it is necessary to ensure the safety of the battery as much as possible when using or charging.

[0031] Generally, a battery is composed of a plurality of battery cells connected and combined. When situations such as external short circuit, overcharge, nail penetration, flat plate impact, etc. occur in the battery cell, thermal runaway is likely to occur in the battery cell. When the battery undergoes thermal runaway, emissions are generated inside the battery cell. The emissions include, but are not limited to, electrolytic solution, dissolved or fragmented positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases generated by reactions, flames, etc. These emissions cause heat diffusion during the emission process, thereby causing other battery cells to undergo thermal runaway and further causing accidents such as explosions.

[0032] Regarding the thermal runaway of a battery cell, the current effective solution is to install a fire-fighting pipeline. That is, when the battery cell undergoes thermal runaway, fire-fighting is carried out by adopting the fire-fighting pipeline, thereby preventing or delaying the occurrence of explosion or fire of the battery cell. The fire-fighting pipeline is generally installed inside the housing. When the battery cell undergoes thermal runaway, the fire-fighting pipeline discharges a fire-fighting medium to conduct fire-fighting.

[0033] However, the applicant has discovered that batteries adopting fire-fighting pipelines still face the problem that the thermal runaway of the battery cannot be timely eliminated. In response to the above problem, the applicant tried to change the position of the fire-fighting pipeline and the fire-fighting method, but none of them could solve the above problem. Through long-term research, the applicant has discovered that the reason why there is still a safety risk in the battery with the fire-fighting pipeline installed is that the position of the fire-fighting pipeline changes during the thermal runaway process of the battery, and furthermore, the fire-fighting pipeline cannot timely provide the fire-fighting medium to the thermal runaway site. Therefore, the applicant installed a fixing member inside the battery, the fixing member is fixed to the battery cell, and the fire-fighting pipeline is fixed by the fixing member. Thereby, the problem that the fire-fighting cannot be in time due to the change of the position of the fire-fighting pipeline during the thermal runaway process of the battery can be overcome. However, when the fusing port of the fire-fighting pipeline is on the side edge of the fixing member, the side edge of the fixing member hinders the flow of the fire-fighting medium. In this way, when the fire-fighting medium flows out of the fire-fighting pipeline, the fixing member hinders the flow of the fire-fighting medium. Therefore, the amount of the fire-fighting medium flowing into the thermal runaway site of the battery is reduced, and the fire-fighting efficiency is decreased. Or, it causes the problem that the fire-fighting medium discharged from the fire-fighting pipeline cannot timely reach the thermal runaway site of the battery.

[0034] In view of this, the present application provides a battery. The fire-fighting pipeline is fixed by a fixing member, and a flow guiding structure is installed on the fixing member. When the fire-fighting passage discharges the fire-fighting medium, the flow guiding structure guides the fire-fighting medium to the thermal runaway site of the battery. Thereby, the problem that the amount of the fire-fighting medium flowing into the thermal runaway site of the battery decreases during the thermal runaway of the battery, or the problem that the fire-fighting medium cannot timely reach the thermal runaway site of the battery is alleviated.

[0035] The battery in the embodiments of the present application is applicable to various electrical devices that can be powered by electrical energy. The electrical devices here include, but are not limited to, electric vehicles, electric trains, electric bicycles, golf carts, unmanned aerial vehicles, or ships. Moreover, the electrical device may be a device that provides power using only the battery, or it may be a hybrid device. The battery provides electrical energy to the electrical device and drives the electric device to run by means of a motor.

[0036] For example, FIG. 1a shows a schematic structural diagram of an electrical device according to some embodiments of the present application. The electrical device may be a vehicle, and the vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle, etc. The vehicle includes a battery 100, a controller 200, and a motor 300. The battery 100 is used to supply power to the controller 200 and the motor 300, serving as the operating power source and driving power source of the vehicle. For example, the battery 100 is used for the starting, navigation, and operating power consumption needs during driving of the vehicle. For example, the battery 100 supplies power to the controller 200. The controller 200 controls the battery 100 to supply power to the motor 300. The motor 300 receives and uses the power of the battery 100. The motor 300, as the driving power source of the vehicle, replaces or partially replaces fuel oil or natural gas to provide driving power to the vehicle.

[0037] In order for the battery to achieve higher functions and meet the usage requirements, the battery 100 can include a plurality of battery cells 1 connected to each other. As shown in FIG. 1b, the battery 100 includes a first case 101, a second case 102, and a plurality of battery cells 1. Here, by engaging the first case 101 and the second case 102 with each other, the plurality of battery cells 1 are arranged in a space formed and surrounded by the first case 101 and the second case 102. The plurality of battery cells 1 can be connected in series, in parallel, or in a series-parallel connection manner to achieve a large current or voltage. Here, the series-parallel connection refers to a combination of series connection and parallel connection.

[0038] To enable those skilled in the art to clearly understand the improvements of the present application, the overall structure of the battery cell 1 will first be described.

[0039] As shown in FIG. 1c, the battery cell 1 includes a case 13, an electrode assembly 14, and an end cover assembly 15. The end cover assembly 15 includes an end cover plate 151, and the end cover plate 151 is connected to the case 13. The electrode assembly 14 is installed in the case 13, and the case 13 is filled with an electrolyte. The battery cell 1 may be cubic, cuboid, or cylindrical. According to the requirements in actual use, the electrode assembly 14 can be installed singly or in multiple numbers.

[0040] The electrode assembly 14 can form a main body by winding or stacking together a first electrode sheet, a second electrode sheet, and a separator located between the adjacent first electrode sheet and the second electrode sheet. Here, the separator is an insulator interposed between the adjacent first electrode sheet and the second electrode sheet. In this embodiment, the first electrode sheet is exemplarily described as the positive electrode sheet, and the second electrode sheet is described as the negative electrode sheet. The positive electrode active material is coated on the coating area of the positive electrode sheet, and the negative electrode active material is coated on the coating area of the negative electrode sheet. A plurality of uncoated areas extending from the coating area of the main body are laminated to form tabs 141. The electrode assembly 14 includes two tabs 141, namely a positive electrode tab and a negative electrode tab. The positive electrode tab extends from the coating area of the positive electrode sheet, and the negative electrode tab extends from the coating area of the negative electrode sheet.

[0041] The end cover assembly 15 is installed on the top of the electrode assembly 14. As shown in FIG. 1c, the end cover assembly 15 includes an end cover plate 151 and two electrode terminals 12. The two electrode terminals 12 are a positive electrode terminal and a negative electrode terminal respectively, and one connection member 16 is correspondingly installed on each electrode terminal 12. The connection member 16 is located between the end cover plate 151 and the electrode assembly 14.

[0042] For example, in FIG. 1c, the tab 141 of the electrode assembly 14 is located at the top. The positive electrode tab is connected to the positive electrode terminal by one connecting member 16, and the negative electrode tab is connected to the negative electrode terminal by the other connecting member 16.

[0043] An explosion-proof member can be further installed on the end cover plate 151. The explosion-proof member is used to timely release the gas in the battery cell 1 and avoid the occurrence of explosion when there is too much gas in the battery cell 1. The end cover plate 151 is provided with exhaust holes. The exhaust holes can be provided at an intermediate position along the length direction of the end cover plate 151. The explosion-proof member includes a relief mechanism 11. The relief mechanism 11 is installed in the exhaust hole. In the normal state, the relief mechanism 11 is airtightly attached to the exhaust hole. When the air pressure in the case rises due to the expansion of the battery cell 1 until it exceeds a predetermined value, the relief mechanism 11 operates and opens, and the gas is released outward by the relief mechanism 11.

[0044] The relief mechanism 11 is an element or member that can operate to release the internal pressure and / or internal substances when the internal pressure or internal temperature of the battery cell 1 reaches a predetermined threshold value. Specifically, the relief mechanism 11 can adopt an explosion-proof valve, an air valve, a relief valve or a safety valve, etc., and can adopt a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold value, the relief mechanism 11 executes an operation or a fragile structure provided in the relief mechanism 11 is destroyed. Thereby, an opening or passage for releasing the internal pressure is formed.

[0045] The threshold value referred to in the present application may be a pressure threshold value or a temperature threshold value. The design of the threshold value varies according to different design requirements. For example, the threshold value can be designed or determined based on the internal pressure or internal temperature value of the battery cell 1 where there is a risk of danger or runaway. And the threshold value may depend on, for example, the material used for one or more of the positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery cell 1.

[0046] As used herein, "activation" refers to the release of the internal pressure of the battery cell 1 when the relief mechanism 11 operates or is activated to a certain state. The operation generated by the relief mechanism 11 includes, but is not limited to, at least a part of the relief mechanism 11 bursting, crushing, tearing, or opening. When the relief mechanism 11 operates, the high-temperature and high-pressure substances inside the battery cell 1 are discharged out from the part where it operates as emissions. In this way, the battery cell 1 can be released in the case of controllable pressure or temperature, thereby avoiding the occurrence of potential more serious accidents.

[0047] The emissions from the battery cell 1 in the present application include, but are not limited to, electrolytic solution, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gas generated by reactions, flames, etc.

[0048] The high-temperature and high-pressure emissions are discharged in the direction where the relief mechanism 11 of the battery cell 1 is installed. More specifically, they are discharged along the direction of the region that operates towards the relief mechanism 11. The power and destructive force of such emissions may be large, and there is a possibility of sufficiently destroying one or more structures such as the cover in this direction.

[0049] In some embodiments, as shown in FIG. 1c, a through hole for injecting electrolytic solution into the battery cell 1 is provided in the end cover plate 151. The through hole can adopt a circular hole, an elliptical hole, a polygonal hole, or other shaped holes, and can extend along the height direction of the end cover plate 151. A sealing member 152 for sealing the through hole is provided on the end cover plate 151.

[0050] FIGS. 2 to 5 are schematic structural diagrams of fixing the fire protection pipeline 2 to the battery in some embodiments of the present application.

[0051] The fire protection pipeline 2 in the embodiments of the present application is used to accommodate a fire protection medium. The fire protection medium here may be a fluid, and the fluid may be a liquid or a gas.

[0052] When the relief mechanism 11 does not damage the fire protection pipeline 2, it is not necessary to contain any substance in the fire protection pipeline 2. When the relief mechanism 11 operates, a fire protection medium can be contained in the fire protection pipeline 2, and for example, it can be controlled that the fire protection medium enters the fire protection pipeline 2 by an on-off valve.

[0053] Or, when the relief mechanism 11 is not damaged, the fire protection medium may always be contained in the fire protection pipeline 2. The fire protection medium may further be used to adjust the temperature of the battery cell 1. Temperature adjustment means heating or cooling the battery cell 1. When cooling or reducing the temperature of the battery cell 1, the fire protection pipeline 2 contains a cooling fluid and is used to lower the temperature of the plurality of battery cells 1. At this time, the fire protection pipeline 1 can be called a cooling member, a cooling system, a cooling pipeline, or the like. The contained fire protection medium can be called a cooling medium or a cooling fluid, and more specifically, it can be called a coolant or a cooling gas.

[0054] Preferably, the fire protection medium can achieve a higher temperature adjustment effect by circulating and flowing. The fire protection medium is preferably water, a mixture of water and ethylene glycol, or air, etc.

[0055] As shown in FIGS. 2 to 5, a fixing member 3 is installed on the battery cell 1. The fixing member 3 is connected to the electrode terminal 12 of the battery cell 1. The fire protection pipeline 2 is fixed to the fixing member 3. Thereby, the fire protection pipeline 2 is fixed to the battery cell 1, and the fire protection pipeline 2 is used to contain the fire protection medium. In the present application, the fire protection pipeline 2 is fixed to the electrode terminal 12 by the fixing member 3. On the one hand, the fixing method of the fire protection pipeline 2 is simplified, and the fixing operation of the fire protection pipeline 2 is made easier. On the other hand, the fixing effect of the fire protection pipeline is guaranteed. Thereby, it is avoided that the fire protection cannot keep up due to the change in the position of the fire protection pipeline during the thermal runaway process of the battery.

[0056] As shown in FIGS. 2 to 5, in some embodiments, the battery includes a battery cell 1, a fire protection pipeline 2, and a fixing member 3. The battery cell 1 includes a relief mechanism 11, and the relief mechanism 11 is arranged to operate to release the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold value. The fire protection pipeline 2 is used to accommodate a fire protection medium, and the fire protection pipeline 2 is arranged to discharge the fire protection medium when the relief mechanism 11 operates. The fixing member 3 is provided between the battery cell 1 and the fire protection pipeline 2, and the fixing member 3 is arranged to fix the fire protection pipeline 2. An overcurrent region 31 and a flow guiding structure 32 are provided on the fixing member 3. The overcurrent region 31 covers the relief mechanism 11, and the overcurrent region 31 is arranged such that when the relief mechanism 11 operates, the fire protection medium passes through the overcurrent region 31 and flows to the battery cell 1. The flow guiding structure 32 is arranged to guide the fire protection medium to the overcurrent region 31 when the relief mechanism 11 operates.

[0057] When the battery undergoes thermal runaway, the relief mechanism 11 operates and the fire protection pipeline 2 melts. Thereby, a fire protection medium such as a coolant flows out from the fire protection pipeline 2, and the melted part of the fire protection pipeline 2 is not fixed. Therefore, if the melted part of the fire protection pipeline 2 faces the overcurrent region 31, the fire protection medium directly flows through the overcurrent region 31 to the battery cell 1, effectively performing cooling fire protection. However, if the melted part of the fire protection pipeline 2 is on the side of the overcurrent region 31, or the fire protection medium sprayed from the fire protection pipeline 2 flows to the side of the overcurrent region 31, the flow guiding structure 32 can guide the fire protection medium to the overcurrent region 31. Therefore, by installing the flow guiding structure 32 on the fixing member 3, more fire protection medium can be made to flow into the thermal runaway part of the battery, and the flow guiding structure 32 can make the fire protection medium flow to the thermal runaway part of the battery more smoothly. As a result, the fire protection effect is improved, and the problem that fire protection is not in time during the process of the battery undergoing thermal runaway is alleviated.

[0058] In some embodiments, the overcurrent region 31 includes a through hole or a weak region. The weak region is arranged to be broken when the relief mechanism 11 operates to form a through hole.

[0059] As shown in FIGS. 2 to 4, in some embodiments, a plurality of battery cells 1 are sequentially installed along the length direction of the fire pipeline 2, and the fixing member 3 is fixed to the battery cell 1. Each fixing member 3 may be fixedly attached to each battery cell 1 correspondingly, or each fixing member 3 may be fixedly attached to some of the battery cells 1 correspondingly. Each fixing member 3 located on the battery cells 1 in the same column fixes a single fire pipeline 2 simultaneously. The plurality of fixing members 3 prevent the position of the fire pipeline 2 from changing by fixedly connecting the fire pipeline 2 to the battery cell 1. The projection of the fire pipeline 2 on the fixing member 3 covers most of the overcurrent area 31 and most of the flow guiding structure 32 of the fixing member 3.

[0060] As shown in FIG. 5, in some embodiments, the fixing member 3 is fixedly attached to the top of the battery cell 1, and the fire pipeline 2 is installed on the top of the fixing member 3.

[0061] As shown in FIGS. 4 and 6, in some embodiments, the flow guiding structure 32 and the overcurrent area 31 are arranged along the longitudinal direction of the fire pipeline 2.

[0062] When the battery undergoes thermal runaway, the relief mechanism 11 operates and the fire pipeline 2 is melted. Thereby, a fire extinguishing medium such as a coolant flows out from the fire pipeline 2. When the melted part of the fire pipeline 2 is located on the side of the overcurrent area 31, or the fire extinguishing medium ejected from the fire pipeline 2 flows to the side of the overcurrent area 31, by arranging the flow guiding structure 32 and the overcurrent area 31 along the longitudinal direction of the fire pipeline 2, the flow guiding structure 32 can guide the fire extinguishing medium on the side of the overcurrent area 31 to the overcurrent area 31. Thereby, more fire extinguishing medium can smoothly flow to the battery cell 1 through the overcurrent area 31, improving the fire extinguishing effect and alleviating the problem that the fire extinguishing cannot keep up during the process of the battery undergoing thermal runaway.

[0063] As shown in FIGS. 6 and 7, in some embodiments, the flow guiding structure 32 includes a concave portion 321. The concave portion 321 is recessed along the direction of the fixing member 3 towards the battery cell 1, and the concave portion 321 communicates with the overcurrent area 31 and the side edge of the fixing member 3.

[0064] The recess 321 is formed by thinning the material of the fixing member 3. The fire-fighting medium flows into the overflow region 31 under the guiding action of the recess 321. The recess 321 reduces the obstacle to the flow of the fire-fighting medium in the fixing member 3 and decreases the flow resistance of the fire-fighting medium. Therefore, more fire-fighting medium can flow smoothly into the battery cell 1 through the overflow region 31, and the fire-fighting effect can be improved.

[0065] In some embodiments, the overflow region 31 and the side edge of the fixing member 3 are arranged along the longitudinal direction of the fire-fighting pipeline 2.

[0066] The recess 321 communicates with the overflow region 31 and the side edge of the fixing member 3, and the overflow region 31 and the side edge of the fixing member 3 are arranged along the length direction of the fire-fighting pipeline 2. That is, the recess 321 extends along the length direction of the fire-fighting pipeline 2. Therefore, whether it is the part facing the overflow region 31 of the fire-fighting pipeline 2 or the part located on the side of the overflow region 31, it will be melted. Thereby, the fire-fighting medium discharged from the fire-fighting pipeline 2 directly flows into the overflow region 31 or flows into the recess 321, and under the guiding action of the recess 321, more fire-fighting medium is made to flow into the overflow region 31, improving the fire-fighting effect.

[0067] As shown in FIGS. 6 to 9, in some embodiments, along the direction from the overflow region 31 to the side edge of the fixing member 3, the width of the recess 321 is uniform. As shown in FIGS. 10 to 13, in some embodiments, along the direction from the overflow region 31 to the side edge of the fixing member 3, the width of the recess 321 is different.

[0068] In some embodiments, the recess 321 is configured as a straight channel, a curved channel, or a combined channel in which a straight line is connected to a curve.

[0069] As shown in FIGS. 6 to 9, the linear flow path includes a rectangular flow path. As shown in FIGS. 10 and 11, the linear flow path includes a trapezoidal flow path, and the short side of the trapezoidal flow path is connected to the overflow region 31. As shown in FIGS. 12 and 13, the combined flow path in which a straight line is connected to a curve includes a combined flow path in which a rectangular flow path is connected to a semi-circular flow path. The semi-circular flow path is connected to the overflow region 31, and the rectangular flow path communicates with the arc-shaped edge of the semi-circular flow path. As shown in FIGS. 14 and 15, the linear flow path includes a parallelogram flow path, that is, an inclined flow path. As shown in FIGS. 16 and 17, the curved flow path includes an S-shaped curved flow path.

[0070] As shown in FIGS. 8 and 9, in some embodiments, the flow guiding structure 32 may further include a reinforcing rib 323. Among the reinforcing ribs 323, the part connected to the overflow region 31 of the recess 321 is the first part, and the part connected to the side edge of the fixing member 3 of the recess 321 is the second part. The reinforcing rib 323 may be installed at the first part, or the reinforcing rib 323 may be installed at the second part, or the reinforcing rib 323 may be installed between the first part and the second part. By providing the reinforcing rib 323, the strength of the fixing member 3 is improved.

[0071] As shown in FIGS. 8 and 9, in some embodiments, the reinforcing rib 323 is provided at one end close to the overflow region 31 of the recess 321. That is, the reinforcing rib 323 is provided at the first part.

[0072] By providing the reinforcing rib 323, the strength of the fixing member 3 can be improved. The fire-fighting medium flows into the overflow region 31 under the guiding action of the recess 321 and breaks through the reinforcing rib 323 due to inertia in the reinforcing rib 323 and enters the overflow region 31. Therefore, the reinforcing rib 323 does not generate excessive interference with the flow of the fire-fighting medium.

[0073] As shown in FIGS. 18 to 21, in some embodiments, the flow guiding structure 32 includes a notch 322. The notch 322 and the overflow region 31 are arranged along the longitudinal direction of the fire pipeline 2. The notch 322 is formed by removing material from the side edge of the fixing member 3 to the overflow region 31. Here, the side edge of the fixing member 3 and the overflow region 31 are located in the longitudinal direction of the fire pipeline 2.

[0074] The notch 322 is formed by removing material from the fixing member 3. The flow resistance generated by the fixing member 3 against the fire medium can be reduced, and more fire medium can flow into the overflow region 31 more smoothly.

[0075] The notch 322 is formed by removing material. The fire medium first passes through the notch 322 and then passes through the non-removed region by inertia, or vice versa.

[0076] As shown in FIGS. 22 to 25, in some embodiments, the flow guiding structure 32 includes a recess 321 and a notch 322. The recess 321 is formed by being recessed along the direction towards the battery cell 1 of the fixing member 3, and the recess 321 communicates the overflow region 31 with the side edge of the fixing member 3. The notch 322 is provided in the recess 321 and is formed by removing material from the side edge of the fixing member 3 to the overflow region 31. Here, the side edge of the fixing member 3 and the overflow region 31 are located in the longitudinal direction of the fire pipeline 2.

[0077] The flow guiding structure 32 includes a recess 321 formed of a thinning material, and further includes a notch 322 formed by removing material in the recess 321. The combination of the recess 321 and the notch 322 can reduce the resistance generated by the fixing member 3 during the flow process of the fire medium, and allow more fire medium to flow into the thermal runaway site more smoothly.

[0078] As shown in FIGS. 20 and 21, in some embodiments, the notch 322 is configured as a rectangular notch 3221. As shown in FIGS. 22 and 23, the notch 322 is configured as an arc-shaped notch 3222.

[0079] The shape of the notch 322 is not limited to the rectangular notch 3221 and the arc-shaped notch 3222. By installing the notch 322, the resistance generated in the flow process of the fire-fighting medium of the fixing member 3 can be reduced, and more fire-fighting medium can flow smoothly into the thermal runaway part.

[0080] Naturally, the shape and position of the notch 322 are not necessarily limited as above.

[0081] In some embodiments, along the longitudinal direction of the fire-fighting pipeline 2, flow guiding structures 32 are installed on both sides of the overcurrent area 31.

[0082] The recess 321 extends along the longitudinal direction of the fire-fighting pipeline 2. Therefore, no matter which part of the fire-fighting pipeline 2 is melted, the fire-fighting medium released from the fire-fighting pipeline 2 directly flows into the overcurrent area 31 or flows to the flow guiding structure 32. Thus, due to the guiding action of the flow guiding structure 32, more fire-fighting medium flows into the overcurrent area 31, improving the fire-fighting effect.

[0083] As shown in FIGS. 6 to 25, in some embodiments, the fixing member 3 includes a stopper portion 37. The stopper portion 37 is arranged to limit the radial movement of the fire-fighting pipeline 2.

[0084] As shown in FIGS. 4, 6 to 25, in some embodiments, the battery cell 1 includes an electrode terminal 12, and the fixing member 3 includes a main body portion 34, a connection portion 35, and a connection strip 36. The main body portion 34 conforms to the shape of the top surface of the battery cell 1. Both the overcurrent area 31 and the flow guiding structure 32 are provided on the main body portion 34. The connection portion 35 conforms to the shape of the electrode terminal 12 and is connected to the electrode terminal 12. The connection strip 36 connects the main body portion 34 and the connection portion 35. The maximum dimension of the connection strip 36 in the longitudinal direction of the fire-fighting pipeline 2 is smaller than the maximum dimensions of the main body portion 34 and the connection portion 35 in the longitudinal direction of the fire-fighting pipeline 2, respectively.

[0085] Hereinafter, with reference to FIGS. 2 to 25, some specific embodiments of the battery and the fixing member 3 will be described.

[0086] As shown in FIGS. 2 and 3, two rows of battery cells 1 are provided in the case 102, and each row of battery cells 1 includes a plurality of battery cells 1. A fixing member 3 is provided for each of the plurality of battery cells 1 located in the middle region, and the connecting portion 35 of the fixing member 3 is connected to the electrode terminal 12 of the battery cell 1. Each fixing member 3 located on the battery cells 1 in the same row is fixed to the same fire pipeline 2.

[0087] As shown in FIGS. 4 and 5, the longitudinal direction of the fire pipeline 2 coincides with the arrangement direction of a single row of battery cells 1. The projection of the fire pipeline 2 on the battery cells 1 covers most of the region of the relief mechanism 11, and the projection of the fire pipeline 2 on the fixing member 3 covers most of the regions of the overcurrent region 31 and the flow guiding structure 32.

[0088] As shown in FIGS. 6 and 7, in the first embodiment of the fixing member 3, the fixing member 3 includes an overcurrent region 31, a recess 321, a main body portion 34, a connecting portion 35, a connecting strip 36, and a stopper portion 37.

[0089] The main body portion 34 conforms to the top surface shape of the battery cell 1, and both the overcurrent region 31 and the recess 321 are provided in the main body portion 34. Recesses 321 are provided on both sides of the overcurrent region 31 along the longitudinal direction of the fire pipeline 2. The recess 321 is formed by thinning the material of the fixing member 3. The recess 321 is a rectangular flow channel.

[0090] Two stopper portions 37 are installed at the location of each recess 321. The two stopper portions 37 are installed along the radial direction of the fire pipeline 2, limit the fire pipeline 2, and are used to prevent the radial movement of the fire pipeline 2.

[0091] The connecting portion 35 conforms to the shape of the electrode terminal 12 and is used to connect the electrode terminal 12. The connecting strip 36 connects the main body portion 34 and the connecting portion 35. The maximum dimension of the connecting strip 36 in the longitudinal direction of the fire pipeline 2 is smaller than the maximum dimensions of the main body portion 34 and the connecting portion 35 in the longitudinal direction of the fire pipeline 2, respectively.

[0092] When the battery undergoes thermal runaway, the fire protection pipeline 2 melts, and the fire protection medium such as the coolant flows out. The fire protection medium passes through the recess 321 where it is thinned and flows into the overcurrent region 31. Therefore, it is easy for the fire protection medium to flow into the thermal runaway site.

[0093] Figures 8 and 9 show a second embodiment of the fixing member 3. The difference between the second embodiment of the fixing member 3 and the first embodiment of the fixing member 3 is that a reinforcing rib 323 is provided on one side connected to the overcurrent region 31 of the recess 321. By providing the reinforcing rib 323, the strength of the fixing member 3 can be reinforced. The fire protection medium first passes through the thinned recess 321 and then can flow over the reinforcing rib 323 by inertia and into the thermal runaway site.

[0094] Figures 10 and 11 show a third embodiment of the fixing member 3. The difference between the third embodiment of the fixing member 3 and the first embodiment of the fixing member 3 is that the recess 321 is a trapezoidal flow path, the short side of the trapezoidal flow path is connected to the overcurrent region 31, and the speed at which the fire protection medium flows into the overcurrent region 31 can be improved. Of course, if it is necessary to reduce the speed at which the fire protection medium is injected into the overcurrent region 31, the long side of the trapezoidal flow path can be connected to the overcurrent region 31.

[0095] Figures 12 and 13 show a fourth embodiment of the fixing member 3. The difference between the fourth embodiment of the fixing member 3 and the first embodiment of the fixing member 3 is that the recess 321 is a combined flow path in which a rectangular flow path is connected to a semi-circular flow path, the semi-circular flow path is connected to the overcurrent region 31, and the rectangular flow path communicates with the arc-shaped edge of the semi-circular flow path.

[0096] Figures 14 and 15 show a fifth embodiment of the fixing member 3. The difference between the fifth embodiment of the fixing member 3 and the first embodiment of the fixing member 3 is that the recess 321 is a parallelogram flow path, and by installing the parallelogram flow path, the angle at which the fire protection medium flows into the overcurrent region 31 can be adjusted.

[0097] Figures 16 and 17 show the sixth embodiment of the fixing member 3. The difference between the sixth embodiment of the fixing member 3 and the first embodiment of the fixing member 3 is that the recess 321 is an S-shaped flow path, and by installing the S-shaped flow path, the angle at which the fire-fighting medium flows into the overflow region 31 can be adjusted.

[0098] Figures 18 and 19 show the seventh embodiment of the fixing member 3. The difference between the seventh embodiment of the fixing member 3 and the first embodiment of the fixing member 3 is that the flow guiding structure 32 is not the recess 321, but the flow guiding structure 32 is a notch 322 formed by removing material from the side of the overflow region 31, and the notch 322 is an arc-shaped notch 3222.

[0099] Figures 20 and 21 show the eighth embodiment of the fixing member 3. The difference between the eighth embodiment of the fixing member 3 and the first embodiment of the fixing member 3 is that the flow guiding structure 32 is not the recess 321, but the flow guiding structure 32 is a notch 322 formed by removing material from the side of the overflow region 31, and the notch 322 is a rectangular notch 3221.

[0100] Figures 22 and 23 show the ninth embodiment of the fixing member 3. The difference between the ninth embodiment of the fixing member 3 and the first embodiment of the fixing member 3 is that an arc-shaped notch 3222 is installed in the recess 321, and the arc-shaped notch 3222 is formed by removing material from the side edge of the fixing member 3. In the ninth embodiment of the fixing member 3, the flow guiding structure 32 includes the recess 321 formed of a thinning material, and further includes the arc-shaped notch 3222 formed by removing material. The recess 321 and the notch 322 are combined to guide the fire-fighting medium and further improve the fire-fighting effect.

[0101] Figures 24 and 25 show the tenth embodiment of the fixing member 3. The difference between the tenth embodiment of the fixing member 3 and the ninth embodiment of the fixing member 3 is that a reinforcing rib 323 is installed at the portion of the recess 321 connected to the overflow region 31. By installing the reinforcing rib 323, the strength of the fixing member 3 is improved.

[0102] Some embodiments further provide an electrical device, including the above battery, which is arranged to provide electrical energy.

[0103] The electrical device includes the battery provided by the embodiments of the present application. Therefore, the electrical device correspondingly has the beneficial effects of the battery, which are omitted here.

[0104] In some embodiments, the electrical device includes a vehicle.

[0105] Some embodiments further provide a method for manufacturing a battery. The method includes steps of attaching battery cell 1, where battery cell 1 includes a relief mechanism 11 arranged to operate to release internal pressure when the internal pressure or temperature of battery cell 1 reaches a threshold value; attaching a fixing member 3; attaching and fixing a fire protection pipeline 2 by the fixing member 3, where the fire protection pipeline 2 is used to accommodate a fire protection medium and is arranged to discharge the fire protection medium when the relief mechanism 11 operates. Here, an overcurrent area 31 and a flow guiding structure 32 are provided on the fixing member 3. The overcurrent area 31 covers the relief mechanism 11 and is arranged such that when the relief mechanism 11 operates, the fire protection medium passes through the overcurrent area 31 and flows to the battery cell 1. The flow guiding structure 32 is arranged to guide the fire protection medium to the overcurrent area 31 when the relief mechanism 11 operates.

[0106] When the battery undergoes thermal runaway, the relief mechanism 11 activates, melting the fire protection pipe 2, and the fire protection medium such as the coolant flows out from the fire protection pipe 2. If the melted part of the fire protection pipe 2 faces the overcurrent area 31, the fire protection medium flows directly through the overcurrent area 31 to the battery cell 1 to perform cooling fire protection. When the melted part of the fire protection pipe 2 is on the side of the overcurrent area 31, or when the fire protection medium ejected from the fire protection pipe 2 flows to the side of the overcurrent area 31, the flow guiding structure 32 guides the fire protection medium to the overcurrent area 31. Therefore, by installing the flow guiding structure 32 on the fixing member 3, more fire protection medium flows to the thermal runaway part, and the flow guiding structure 32 enables the fire protection medium to flow smoothly to the battery cell 1. Thereby, the fire protection effect can be improved, and the problem that fire protection cannot keep up during the process of the battery undergoing thermal runaway can be alleviated.

[0107] Some embodiments further provide equipment for manufacturing a battery. The equipment for manufacturing a battery includes a battery cell mounting device used for mounting the battery cell 1, where the battery cell 1 includes a relief mechanism 11, and the relief mechanism 11 is arranged to activate and release the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold value; a fixing member mounting device for mounting the fixing member 3; and a fire protection pipe mounting device used for mounting the fire protection pipe 2, fixing the fire protection pipe 2 to the fixing member 3, where the fire protection pipe 2 is used for accommodating the fire protection medium and is arranged to discharge the fire protection medium when the relief mechanism 11 activates. Here, the overcurrent area 31 and the flow guiding structure 32 are provided on the fixing member 3, the overcurrent area 31 covers the relief mechanism 11, and when the relief mechanism 11 activates, the fire protection medium is arranged to flow through the overcurrent area 31 to the battery cell 1, and the flow guiding structure 32 is arranged to guide the fire protection medium to the overcurrent area 31 when the relief mechanism 11 activates.

[0108] When the battery undergoes thermal runaway, the relief mechanism 11 operates, melting the fire protection pipeline 2, and the fire protection medium such as the coolant flows out from the fire protection pipeline 2. If the melted part of the fire protection pipeline 2 faces the overcurrent area 31, the fire protection medium flows directly through the overcurrent area 31 to the battery cell 1 to perform cooling fire protection. When the melted part of the fire protection pipeline 2 is on the side of the overcurrent area 31, or the fire protection medium sprayed from the fire protection pipeline 2 flows to the side of the overcurrent area 31, the flow guiding structure 32 guides the fire protection medium to the overcurrent area 31. Therefore, by installing the flow guiding structure 32 on the fixing member 3, more fire protection medium flows to the thermal runaway part, and the flow guiding structure 32 enables the fire protection medium to flow smoothly to the battery cell 1. Thereby, the fire protection effect is improved, and the problem that the fire protection cannot keep up during the process of the battery undergoing thermal runaway can be alleviated.

[0109] The present application has been described with reference to the preferred embodiments. However, various improvements can be made without departing from the scope of the present application, and the members therein can be replaced with equivalents. In particular, as long as there is no structural conflict, all the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments described in this specification, but includes all the technical solutions within the scope of the claims.

Description of Reference Numerals

[0110] 1 - Battery cell, 11 - Relief mechanism, 12 - Electrode terminal, 13 - Case, 14 - Electrode assembly, 141 - Tab, 15 - End cover assembly, 151 - End cover plate, 152 - Sealing member, 16 - Connecting member, 2 - Fire protection pipeline, 3 - Fixing member, 31 - Overcurrent area, 32 - Flow guiding structure, 321 - Recess, 322 - Notch, 3221 - Rectangular notch, 3222 - Arc-shaped notch, 323 - Reinforcing rib, 34 - Main body part, 35 - Connecting part, 36 - Connecting strip, 37 - Stopper part, 100 - Battery, 101 - First case, 102 - Second case, 200 - Controller, 300 - Motor.

Claims

1. A battery, comprising a battery cell (1) including a relief mechanism (11), wherein the relief mechanism (11) is arranged to operate when the internal pressure or temperature of the battery cell (1) reaches a threshold value to release the internal pressure; a fire-fighting pipeline (2) used for accommodating a fire-fighting medium, wherein the fire-fighting pipeline (2) is arranged to discharge the fire-fighting medium when the relief mechanism (11) operates; a fixing member (3) installed between the battery cell (1) and the fire-fighting pipeline (2), wherein the fixing member (3) is arranged to fix the fire-fighting pipeline (2), wherein an overcurrent region (31) and a flow guiding structure (32) are arranged on the fixing member (3); the overcurrent region (31) covers the relief mechanism (11), and is arranged such that when the relief mechanism (11) operates, the fire-fighting medium passes through the overcurrent region (31) and flows to the battery cell (1); the flow guiding structure (32) is arranged to guide the fire-fighting medium to the overcurrent region (31) when the relief mechanism (11) operates; the flow guiding structure (32) includes a recess (321); the recess (321) is formed by being recessed along the direction of the battery cell (1) of the fixing member (3); the recess (321) communicates the overcurrent region (31) with the side edge of the fixing member (3). A battery.

2. The battery according to claim 1, wherein the flow guiding structure (32) and the overcurrent region (31) are arranged along the longitudinal direction of the fire-fighting pipeline (2).

3. The battery according to claim 1, wherein the overcurrent region (31) and the side edge of the fixing member (3) are arranged along the longitudinal direction of the fire-fighting pipeline (2).

4. The flow guiding structure (32) includes a reinforcing rib (323); The battery according to any one of claims 1 to 3, wherein the reinforcing rib (323) is provided at one end of the recess (321) close to the overcurrent region (31).

5. The flow guiding structure (32) includes a notch (322); the notch (322) and the overcurrent region (31) are arranged along the longitudinal direction of the fire-fighting pipeline (2); the notch (322) is configured to be formed by removing material from the side edge of the fixing member (3) to the overcurrent region (31). The side edge of the fixing member (3) and the overflow region (31) are located in the longitudinal direction of the fire pipeline (2). The battery according to any one of claims 1 to 4.

6. The notch (322) is a rectangular notch (3221) or an arc-shaped notch (3222). The battery according to claim 5.

7. Along the longitudinal direction of the fire pipeline (2), the diversion structure (32) is installed on either side of the overflow region (31). The battery according to any one of claims 1 to 6.

8. The battery according to any one of claims 1 to 7, The battery is arranged to supply electrical energy. An electrical device.

9. A method of manufacturing a battery, A step of attaching a battery cell (1), wherein the battery cell (1) includes a relief mechanism (11), and the relief mechanism (11) is arranged to operate to release the internal pressure when the internal pressure or temperature of the battery cell (1) reaches a threshold value; A step of attaching a fixing member (3); A step of attaching a fire pipeline (2) and fixing it with the fixing member (3), wherein the fire pipeline (2) is used to accommodate a fire medium, and when the relief mechanism (11) operates, it is arranged to discharge the fire medium. The method includes these steps. An overflow region (31) and a diversion structure (32) are provided on the fixing member (3), The overflow region (31) covers the relief mechanism (11), The overflow region (31) is arranged such that when the relief mechanism (11) operates, the fire medium passes through the overflow region (31) and flows to the battery cell (1). The diversion structure (32) is arranged to guide the fire medium to the overflow region (31) when the relief mechanism (11) operates. The diversion structure (32) includes a recess (321), The recess (321) is formed by being recessed along the direction of the fixing member (3) towards the battery cell (1). The recess (321) communicates the overflow region (31) with the side edge of the fixing member (3). A method.

10. Equipment for manufacturing a battery, A battery cell attachment device, which is used to attach a battery cell (1), the battery cell (1) includes a relief mechanism (11), and the relief mechanism (11) is arranged to operate to release the internal pressure when the internal pressure or temperature of the battery cell (1) reaches a threshold value. A fixing member mounting device, which is a device used for mounting a fixing member (3); A fire-fighting pipeline mounting device, which is used for mounting a fire-fighting pipeline (2), fixes the fire-fighting pipeline (2) to the fixing member (3), the fire-fighting pipeline (2) is used for accommodating a fire-fighting medium, and is arranged to discharge the fire-fighting medium when the relief mechanism (11) operates, and includes: An over-flow region (31) and a flow guiding structure (32) are provided on the fixing member (3); The over-flow region (31) covers the relief mechanism (11); The over-flow region (31) is arranged such that when the relief mechanism (11) operates, the fire-fighting medium passes through the over-flow region (31) and flows to the battery cell (1); The flow guiding structure (32) is arranged to guide the fire-fighting medium to the over-flow region (31) when the relief mechanism (11) operates; The flow guiding structure (32) includes a recess (321); The recess (321) is formed by being recessed along the direction of the fixing member (3) towards the battery cell (1); The recess (321) communicates the over-flow region (31) with the side edge of the fixing member (3).

Images