Battery cell, battery, power consumption device, method for manufacturing a battery cell, and manufacturing equipment for a battery cell

Abstract

This application relates to a battery cell, a battery, and a power consumption device, and is related to the technical field of battery manufacturing. This application provides a battery cell, which includes an outer casing, a pressure relief member disposed on a first wall of the outer casing, an electrode assembly disposed inside the outer casing, an electrolyte in which the electrode assembly is immersed, and a packaging member and active material disposed inside the outer casing. The packaging member is used to package the active material on a side closer to the first wall of the electrode assembly, and the packaging member is configured to be activated to release the active material when the internal pressure or temperature of the battery cell reaches a first threshold. The active material includes a packaging member and active material that can react with the electrolyte and / or the electrode assembly and activate the pressure relief member by increasing the internal pressure or temperature of the battery cell. The battery cell proposed in this application can rapidly release internal temperature and pressure when thermal runaway occurs, and has relatively good safety performance. This application also proposes a battery and a power consumption device including this battery cell.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and specifically, to battery cells, batteries, and power-consuming devices.

Background Art

[0002] With the rapid development of the new energy vehicle industry, the technical level of the lithium battery industry has also rapidly improved, and there are also very high requirements for the safety performance of battery cells.

[0003] When thermal runaway occurs in a battery cell, the internal temperature and pressure rise rapidly. If the internal temperature and pressure cannot be discharged in a timely manner, the battery cell may explode, leading to serious safety accidents.

Summary of the Invention

[0004] Therefore, this application proposes a battery cell, a battery, and a power-consuming device that can rapidly release the internal temperature and pressure when thermal runaway occurs in the battery cell and have relatively good safety performance.

[0005] An embodiment of the first aspect of this application proposes a battery cell. This battery cell includes an outer casing, a pressure relief member installed on a first wall of the outer casing, an electrode assembly installed inside the outer casing, an electrolyte in which the electrode assembly is immersed, a packaging member and an active material installed inside the outer casing. The packaging member is used to package the active material on a side close to the first wall of the electrode assembly. The packaging member is configured to operate and release the active material when the internal pressure or temperature of the battery cell reaches a first threshold. The active material is capable of reacting with the electrolyte and / or the electrode assembly and includes a packaging member and an active material that operate the pressure relief member by increasing the internal pressure or temperature of the battery cell.

[0006] In the battery cell of the embodiment of the present application, the active material is packaged near the pressure relief member. When thermal runaway occurs at a certain part inside the battery cell, the packaging member operates before the temperature or pressure inside the battery reaches the operating threshold of the pressure relief member to release the active material, causing thermal runaway to occur on the side of the electrode assembly close to the pressure relief member, resulting in the electrode assembly being crushed and decomposed, and a large amount of high-temperature and high-pressure gas being generated accordingly. By rapidly increasing the temperature or pressure near the pressure relief member to activate the pressure relief member, the pressure or temperature inside the battery cell is released. In particular, when the thermal runaway site of the battery cell is relatively far from the pressure relief member, by releasing the active material inside the battery cell, it is ensured that when thermal runaway occurs inside the battery cell, the pressure relief member can effectively operate to smoothly release the pressure or temperature inside the battery cell, giving the battery cell relatively high safety performance.

[0007] According to some embodiments of the present application, the pressure relief member is configured to operate to release pressure when the internal pressure or temperature of the battery cell reaches a second threshold, and the second threshold is greater than the first threshold.

[0008] In the above aspect, both the pressure relief member and the packaging member adopt a pressure rupture operation, and by making the operating threshold of the pressure relief member greater than that of the packaging member, it is ensured that the packaging member operates before the pressure relief member, enabling the pressure relief member to release the pressure inside the battery cell and giving the battery cell relatively good safety performance.

[0009] According to some embodiments of the present application, the active material is an oxidizing agent.

[0010] In the above aspect, by adopting an oxidizing agent to react with the electrode assembly and / or the electrolyte, the reaction is rapid and intense, ensuring that the electrode assembly is crushed and decomposed, and a large amount of high-temperature and high-pressure gas is generated accordingly to activate the pressure relief member, and the pressure or temperature at the thermal runaway site inside the battery cell can be smoothly discharged through the pressure relief member.

[0011] According to some embodiments of the present application, the active material includes at least one of potassium permanganate, potassium dichromate, sodium hypochlorite, oxydol, lead dioxide, periodic acid, cobalt trifluoride, and sodium ferrate.

[0012] In the above aspect, the active material of the above type does not react with the outer casing and the packaging member, is a commonly seen oxidizing agent, is easily available, and has a low cost.

[0013] According to some embodiments of the present application, the packaging member packages at least a part of the active material at a position corresponding to the pressure relief member.

[0014] In the above aspect, the active material not only causes a chemical reaction at a position near the pressure relief member to activate the pressure relief member, but also causes a chemical reaction at other positions inside the battery cell to crush the electrode assembly at the corresponding position, thereby smoothing the exhaust passage from the thermal runaway site of the battery cell to the pressure relief member and ensuring that the gas generated at the thermal runaway site of the battery cell can be smoothly discharged through the pressure relief member.

[0015] According to some embodiments of the present application, a pressure relief hole is provided in the outer casing, both the pressure relief member and the packaging member cover the pressure relief hole, the packaging member is installed on the side of the pressure relief member close to the electrode assembly, and the packaging member, the pressure relief member, and the hole wall of the pressure relief hole together define a sealed space for accommodating the active material.

[0016] In the above aspect, the active material is packaged in the pressure relief hole and does not excessively occupy the space inside the battery cell, thereby maintaining the original energy density of the battery cell. And the packaging member releases the active material when it operates, and the active material can cause a chemical reaction at a position close to the pressure relief hole, can surely activate the pressure relief member, and gives the battery cell relatively good safety performance.

[0017] According to some embodiments of the present application, both the pressure relief member and the packaging member are in the form of sheets.

[0018] In the above aspect, both the pressure relief member and the packaging member are in the form of sheets and occupy a relatively small space within the pressure relief hole, so that more space within the pressure relief hole can be used to store the active material.

[0019] According to some embodiments of the present application, the packaging member is made of an insulating material and is disposed between the first wall and the electrode assembly so as to insulate and isolate the electrode assembly from the first wall.

[0020] In the above aspect, the packaging member is not only used to package the active material, but also further used to insulate and isolate the electrode assembly from the first wall, thereby integrating the insulating function and the packaging function of the active material in the packaging member, reducing the number of components inside the battery cell, compacting the structure of the battery cell, and having a relatively high energy density.

[0021] According to some embodiments of the present application, the packaging member has a first accommodation cavity corresponding to the position of the pressure relief member, and at least a part of the active material is packaged within the first accommodation cavity.

[0022] In the above aspect, the packaging member can release the active material within the first accommodation cavity during operation, cause a chemical reaction in the vicinity of the pressure relief member, and reliably activate the pressure relief member, thereby giving the battery cell relatively good safety performance.

[0023] According to some embodiments of the present application, the first accommodation cavity has a first opening, and both the first wall and the pressure relief member close the first opening.

[0024] In the above aspect, the first wall, the pressure - releasing member, and the packaging member together form a sealed first accommodation cavity. Not only is the active material packaged near the pressure - releasing member, but when the active material is released, a chemical reaction can occur near the pressure - releasing member, and the packaging of the active material can be easily realized.

[0025] According to some embodiments of the present application, the first wall is rectangular, the packaging member further has two second accommodation cavities, and in the longitudinal direction of the first wall, the two second accommodation cavities are respectively located on both sides of the first accommodation cavity, a part of the active material is packaged in the first accommodation cavity, and another part is packaged in the two second accommodation cavities.

[0026] In the above aspect, in the longitudinal direction of the first wall, one second accommodation cavity is respectively installed on both sides of the first accommodation cavity. A part of the active material is packaged in the second accommodation cavity. When the active material in the second accommodation cavity is released, a chemical reaction occurs at the corresponding position of the electrode assembly, and the side of the electrode assembly close to the pressure - releasing member can be sufficiently crushed to maintain the exhaust passage from the thermal runaway part of the battery cell to the pressure - releasing member to be smooth.

[0027] According to some embodiments of the present application, the second accommodation cavity has a second opening, and the first wall closes the second opening.

[0028] In the above aspect, the first wall and the packaging member together form a sealed second accommodation cavity. When the active material is released, a chemical reaction can occur at the corresponding position, and the packaging of the active material can be easily realized.

[0029] According to some embodiments of the present application, the outer casing includes a housing and an end cover. The housing has an opening, and the housing includes a side wall and a bottom wall. The bottom wall is installed opposite to the opening. The end cover is connected to the side wall and covers the opening. The first wall is the end cover, the bottom wall, or the side wall.

[0030] In the above aspect, the first wall is the end cover, the bottom wall, or the side wall, and a pressure relief member is provided on the first wall. When thermal runaway occurs at a certain part inside the battery cell, the packaging member operates before the temperature or pressure inside the battery reaches the operating threshold of the pressure relief member to release the active material, so that the part of the electrode assembly close to the pressure relief member is broken down by chemical reaction, and a large amount of high-temperature and high-pressure gas is generated along with the chemical reaction, thereby rapidly increasing the temperature or pressure near the pressure relief member to operate the pressure relief member, and releasing the pressure or temperature inside the battery cell.

[0031] An embodiment of the second aspect of the present application proposes a battery. This battery includes the battery cell according to the embodiment of the first aspect of the present application.

[0032] Due to the characteristics of the battery cell according to the embodiment of the first aspect of the present application, the battery according to the embodiment of the second aspect of the present application also has relatively good safety performance.

[0033] An embodiment of the third aspect of the present application proposes a power consumption device. This power consumption device includes the battery according to the embodiment of the second aspect of the present application.

[0034] Due to the characteristics of the battery according to the embodiment of the second aspect of the present application, the power consumption device according to the embodiment of the third aspect of the present application also has relatively good safety performance.

[0035] An embodiment of the fourth aspect of the present application proposes a manufacturing method of a battery cell. This manufacturing method of the battery cell is providing an outer casing with a pressure relief member installed on the first wall, providing an electrode assembly, providing an electrolyte, To provide a packaging member and an active material, wherein the packaging member is used for packaging the active material, and the packaging member is configured to operate and release the active material when the internal pressure or temperature of the battery cell reaches a first threshold value, and the active material is capable of reacting with the electrolytic solution and / or the electrode assembly, and by increasing the internal pressure or temperature of the battery cell, the pressure relief member is actuated, and installing the electrode assembly in the outer casing, packaging the active material on a side close to the first wall of the electrode assembly using the packaging member, and injecting the electrolytic solution into the outer casing.

[0036] An embodiment of the fifth aspect of the present application proposes a manufacturing apparatus for a battery cell. This manufacturing apparatus for a battery cell a first providing device for providing an outer casing in which a pressure relief member is installed on a first wall, a second providing device for providing an electrode assembly, a third providing device for providing an electrolytic solution, a fourth providing device for providing a packaging member and an active material, wherein the packaging member is used for packaging the active material, and the packaging member is configured to operate and release the active material when the internal pressure or temperature of the battery cell reaches a first threshold value, and the active material is capable of reacting with the electrolytic solution and / or the electrode assembly, and by increasing the internal pressure or temperature of the battery cell, the pressure relief member is actuated, and a fourth providing device, and an attachment module for installing the electrode assembly in the outer casing, packaging the active material on a side close to the first wall of the electrode assembly using the packaging member, and injecting the electrolytic solution into the outer casing.

[0037] Additional aspects and advantages of the present application will be shown in part in the following description, will become apparent in part in the following description, or will be understood by the practice of the present application.

Brief Description of the Drawings

[0038] To more clearly explain the technical solutions of the embodiments of this application, the following briefly introduces the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope of this application. For those skilled in the art, other related drawings can also be obtained based on these drawings without creative effort.

[0039]

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[0040] The above drawings are not provided to scale.

Embodiments for Carrying out the Invention

[0041] In order to make the objectives, technical solutions and advantages of the embodiments of this application clearer, the following will clearly describe the technical solutions in the embodiments of this application while combining the drawings in the embodiments of this application. Obviously, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative efforts belong to the protection scope of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field of this application. In this application, the terms used in the description of the application are only for describing specific embodiments and are not intended to limit this application. The terms "comprising" and "having" and any variations thereof in the description of this application, the claims and the above description of the drawings are intended to cover non-exclusive "comprising". The terms "first", "second", etc. in the description of this application, the claims or the above drawings are not for describing a specific order or a primary-secondary relationship, but for distinguishing different objects.

[0043] The "embodiments" referred to in this application mean that specific features, structures or characteristics described in combination with the embodiments may be included in at least one embodiment of this application. The appearance of this phrase at each position in the description does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0044] In the description of this application, unless otherwise specifically defined or limited, the terms "attachment", "connection", "linkage", and "mounting" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may be a direct linkage or an indirect linkage through an intermediate medium, or even a communication within two elements. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific situation.

[0045] The term "plurality" that appears in this application refers to two or more (including two).

[0046] In this application, the battery cell may include, for example, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc. The embodiments of this application do not limit it. The battery cell may be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The embodiments of this application do not limit it either. Generally, the battery cell is divided into three types: cylindrical battery cell, square battery cell, and pouch battery cell by the packaging method.

[0047] The battery mentioned in the embodiments of this application includes one or more battery cells and is a single physical module that provides a higher voltage and capacity. For example, the battery mentioned in this application may include a battery module, a battery pack, etc. Generally, the battery includes a housing for packaging one or more battery cells, and the housing can prevent liquid or other foreign substances from affecting the charging or discharging of the battery cells.

[0048] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. The battery cell operates mainly by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer already coated, and the positive electrode current collector without the positive electrode active material layer becomes the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer already coated, and the negative electrode current collector without the negative electrode active material layer becomes the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. To ensure that no fusing occurs even when a large current flows, the number of positive electrode tabs is plural and they are laminated, and the number of negative electrode tabs is plural and they are laminated. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc. Note that the electrode assembly may have a wound structure or a laminated structure, and in the embodiments of this application, it is not limited to this.

[0049] The battery cell further includes a pressure relief member, and the pressure relief member operates when the pressure inside the battery cell reaches a threshold value. The design of the threshold value varies according to the design needs. The threshold value may be determined by one or more materials among the positive electrode plate, negative electrode plate, electrolyte, and separator of the battery cell. The pressure relief member may adopt forms such as an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and may also adopt a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure or temperature of the battery cell reaches the threshold value, the pressure relief member executes an operation, or an opening or passage capable of releasing the internal pressure or temperature is formed by the destruction of a fragile structure provided in the pressure relief member.

[0050] As used in this application, "activation" refers to the operation of the pressure relief member or its activation in a certain form, thereby releasing the internal pressure and temperature of the battery cell. The operations generated by the pressure relief member may include, but are not limited to, rupture, crushing, tearing or opening of at least a part of the pressure relief member. When the pressure relief member is activated, the high-temperature and high-pressure substances inside the battery cell are discharged outside from the opened part as emissions. By this method, pressure release and temperature release can be generated in the battery cell under controllable pressure or temperature, thereby avoiding the occurrence of potential and more serious accidents.

[0051] In the related art, when a thermal runaway occurs inside the battery cell, the pressure or temperature inside the battery cell begins to rise. When the pressure or temperature inside the battery cell rises to the threshold value for activating the pressure relief member, at least a part of the pressure relief member ruptures, crushes, tears or opens, and the high-temperature and high-pressure substances inside the battery cell are discharged outside from the opened part, thereby avoiding the occurrence of potential and more serious accidents.

[0052] According to the inventor's research, when the thermal runaway site of the battery cell is relatively far from the pressure relief member, for example, when the thermal runaway site is on the side away from the pressure relief member of the electrode assembly, the reaction force due to the thermal runaway pushes the electrode assembly towards the pressure relief member, causing the pressure relief member to be blocked and the pressure relief member to be unable to operate effectively. The high-temperature and high-pressure gas inside the battery cell cannot be discharged from the pressure relief member, thereby causing the battery cell to explode.

[0053] Based on the above concept, this application proposes a new technical solution that can effectively activate the pressure relief member and rapidly release the pressure or temperature inside the battery cell even when the thermal runaway site is relatively far from the pressure relief member, enabling the battery cell to have relatively high safety performance.

[0054] As can be understood, the battery cells described in the embodiments of the present application may directly supply power to a power consumption device, form a battery by means of parallel connection or series connection, and supply power to various power consumption devices in the form of a battery.

[0055] As can be understood, the power consumption devices that use the battery cells or to which the batteries are applied as described in the embodiments of the present application may be of various types, such as mobile phones, portable devices, notebook computers, electric bicycles, electric vehicles, ships, spacecraft, electric toys, and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spaceships, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric drivers, electric hammers, electric impact drills, concrete vibrators, and electric cutters, etc.

[0056] The battery cells and batteries described in the embodiments of the present application can be applied not only to the power consumption devices described above, but also to all power consumption devices that use all battery cells and batteries. However, for the sake of brevity, the following embodiments will all be described by taking an electric vehicle as an example.

[0057] FIG. 1 shows a simplified schematic diagram of a vehicle in one embodiment of the present application, and FIG. 2 shows a schematic diagram of the structure of the battery of the vehicle in FIG. 1.

[0058] As shown in FIG. 1, a battery 100, a controller 200, and a motor 300 are installed inside the vehicle 1000. For example, the battery 100 may be installed at the bottom, the front end, or the rear end of the vehicle 1000. The vehicle 1000 may be a fuel-powered vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle, etc.

[0059] In some embodiments of the present application, the battery 100 may be used to supply power to the vehicle 1000. For example, the battery 100 may also be used as the operating power supply of the vehicle 1000. The controller 200 is used to control the battery 100 to supply power to the motor 300, and is used, for example, for the starting of the vehicle 1000, the power demand during navigation and driving.

[0060] In other embodiments, the battery 100 may be used as the operating power supply of the vehicle 1000 and may also be used as the driving power supply of the vehicle 1000, and provides driving power to the vehicle 1000 by replacing or partially replacing fuel oil or natural gas.

[0061] Here, the battery 100 mentioned in the embodiments of the present application includes one or more battery cells 10 and refers to a single physical module that provides a higher voltage and capacity. For example, the battery 100 is formed by connecting a plurality of battery cells 10 in series or in parallel.

[0062] As shown in FIG. 2, the battery 100 includes a plurality of battery cells 10 and a housing 20, and the plurality of battery cells 10 are placed in the housing 20. The housing 20 includes a first housing 21 and a second housing 22. The first housing 21 and the second housing 22 are covered with each other to form a battery 100 cavity, and the plurality of battery cells 10 are placed in the battery cavity. Here, the shapes of the first housing 21 and the second housing 22 may be determined by the shape in which the plurality of battery cells 10 are combined, and both the first housing 21 and the second housing 22 may have an opening. mouth For example, both the first housing 21 and the second housing 22 may be hollow rectangular parallelepipeds and only one surface of each is the opening surface. The openings of the first housing 21 and the second housing 22 the mouth are installed opposite to each other, and the first housing 21 and the second housing 22 are engaged with each other to form a housing 20 having a sealed chamber. The plurality of battery cells 10 are connected in parallel or in series with each other, or are connected in series-parallel and combined, and then are placed in the housing 20 formed by the engagement of the first housing 21 and the second housing 22.

[0063] FIG. 3 shows a schematic diagram of the structure of a battery cell of a first form of some embodiments of the present application.

[0064] As shown in FIG. 3, the battery cell 10 includes an outer casing 11, an electrode assembly 12, a pressure relief member 13, two electrode terminals 14, and two current collecting components (not shown). The outer casing 11 includes a housing 111 and an end cover 112. The housing 111 includes a side wall 1112 and a bottom wall 1111. The bottom wall 1111 is installed opposite to the opening 113. The end cover 112 is connected to the side wall 1112 and covers the opening 113. The electrode assembly 12 and the electrolyte are installed inside the outer casing 11, and the electrode assembly 12 is immersed in the electrolyte.

[0065] The housing 111 may be hexahedral, or may be cylindrical or elliptical. The housing 111 may be made of a metal material, such as aluminum, an aluminum alloy, or nickel-plated steel. The size and shape of the end cover 112 match the opening 113 of the housing 111. The end cover 112 is fixed to the opening 113 of the housing 111, thereby confining the electrode assembly 12 and the electrolyte in the accommodation cavity of the housing 111. The end cover 112 may be made of a metal material, such as a material like aluminum or steel. Two electrode lead-out holes are provided in the end cover 112, and the two electrode terminals 14 are installed in the two electrode lead-out holes of the end cover 112. One of the two electrode terminals 14 is a positive electrode terminal, and the other is a negative electrode terminal.

[0066] In some embodiments of the present application, the longitudinal direction of the housing 111 extends along the first direction X, the height direction extends along the second direction Z, the thickness direction extends along the third direction Y, and the opening 113 and the bottom wall 1111 of the housing 111 are installed opposite to each other in the second direction Z. The end cover 112 is rectangular. The longitudinal direction of the end cover 112 extends along the first direction X, the width direction extends along the third direction Y, and the thickness direction extends along the second direction Z. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0067] In other embodiments, the housing 111 may be a cylinder or an elliptical cylinder whose axis extends along the second direction Z, and the size and shape of the end cover 112 match the opening 113 of the housing 111.

[0068] The electrode assembly 12 includes a main body 121 and two polar tabs 122. One of the two tabs 122 is a positive tab 122, and the other is a negative tab 122. The main body 121 includes a positive electrode plate, a negative electrode plate, and a separator. The separator is located between the positive electrode plate and the negative electrode plate and is used to separate the positive electrode plate and the negative electrode plate. One of the two tabs 122 is a positive tab 122, and the other is a negative tab 122. The positive electrode terminal 14 and the positive tab 122 are electrically connected through a current collecting component, and the negative electrode terminal 14 is electrically connected to the negative tab 122 through another current collecting component.

[0069] In some embodiments of the present application, the battery cell 10 includes two electrode assemblies 12. The two electrode assemblies 12 are stacked and installed along the third direction Y. Each electrode assembly 12 includes a main body 121 and two tabs 122 of different polarities. The tabs 122 with the same polarity in the two electrode assemblies 12 are connected to the corresponding one electrode terminal 14 through the same current collecting component. In other embodiments, the battery cell 10 may include only one electrode assembly 12, or may include other numbers of electrode assemblies 12 stacked and installed.

[0070] In some embodiments of the present application, the two tabs 122 of different polarities are both located on the side close to the end cover 112 of the main body 121. In other embodiments, the two tabs 122 of different polarities may be located on both sides of the main body 121 in the first direction X, or may be located on the side away from the end cover 112 of the main body 121 in the second direction Z. The two tabs 122 of different polarities may be located on both sides of the main body 121 in the second direction Z.

[0071] The pressure release member 13 is installed on the outer housing 11, and the pressure release member 13 is used to release the internal pressure and temperature of the battery cell 10 by operating when the internal pressure or temperature of the battery cell 10 reaches a second threshold value. The second threshold value may be a temperature threshold value or a pressure threshold value. The pressure release member 13 may be installed on the bottom wall 1111 or the side wall 1112 of the housing 111, or may be installed on the end cover 112.

[0072] As shown in FIG. 3, in some embodiments of the present application, a pressure release hole 1121 is provided at the central position in the first direction X of the end cover 112, and the pressure release member 13 is installed in the pressure release hole 1121. The two electrode terminals 14 are respectively installed on both sides of the pressure release hole 1121 in the first direction X. In other embodiments, depending on the shape of the battery cell 10, the end cover 112 may have other shapes, such as circular or elliptical, and the electrode terminals 14 and the pressure release member 13 may have other arrangements.

[0073] As shown in FIG. 3, in the battery cell 10 of some embodiments of the present application, the battery cell 10 includes an outer housing 11, a pressure release member 13, an electrode assembly 12, an electrolytic solution (not shown), a packaging member 15, and an active material 16 (see FIG. 5). The electrode assembly 12 is installed inside the outer housing 11, the electrode assembly 12 is immersed in the electrolytic solution, and the pressure release member 13 is installed on the first wall of the outer housing 11. The packaging member 15 and the active material 16 are installed inside the outer housing 11, and the packaging member 15 is used to package the active material 16 on the side close to the first wall of the electrode assembly 12. The packaging member 15 is configured to operate to release the active material 16 when the internal pressure or temperature of the battery cell 10 reaches a first threshold value. The active material 16 can react with the electrolytic solution and / or the electrode assembly 12, and operates the pressure release member 13 by increasing the internal pressure or temperature of the battery cell 10.

[0074] The first wall may be located on the side wall 1112 or the bottom wall 1111 of the housing 111, or may be located on the end cover 112. That is, the pressure release member 13 may be located on the side wall 1112, the bottom wall 1111, or the end cover 112.

[0075] A pressure relief hole 1121 is provided in the first wall, and the pressure relief member 13 is connected to the first wall and covers the pressure relief hole 1121. The pressure relief member 13 may be installed at the central position of the first wall or at a portion close to the edge of the first wall. As for the operating mode of the pressure relief member 13, there are various implementation forms. It may be configured to break when the internal pressure of the battery cell 10 reaches the second threshold value to release the internal pressure or temperature of the battery cell 10, or it may be configured to melt when the internal temperature of the battery cell 10 reaches the second threshold value to release the internal pressure or temperature of the battery cell 10.

[0076] When the packaging member 15 operates, all of the active material 16 may be released near the pressure relief member 13, or a part of the active material 16 may be released near the pressure relief member 13 and a part may be released at other positions.

[0077] As for the method by which the packaging member 15 packages the active material 16, there may be various implementation forms. The packaging member 15 may cooperate with the first wall, the pressure relief member 13, etc. to enclose and form a sealed space to package the active material 16. The packaging member 15 may have a hollow sealed space inside, and may adopt the method of composite injection molding to package the active material 16 inside the packaging member 15. The active material 16 may completely fill the above-mentioned sealed space, or may fill a part of the above-mentioned sealed space.

[0078] The packaging member 15 may be an independently installed member for realizing the function of packaging the active material 16, or may be an improvement of the structure of an existing member for realizing insulation, sealing, etc. inside the battery cell 10 so as to have the function of packaging the active material 16.

[0079] As for the operation mode of the packaging member 15, there are various implementation forms, and the first threshold value may be a pressure threshold value or a temperature threshold value. The packaging member 15 may be configured to break and release the active material 16 when the internal pressure of the battery cell 10 reaches the first threshold value, or may be configured to dissolve and release the active material 16 when the internal temperature of the battery cell 10 reaches the first threshold value.

[0080] The active material 16 may be a liquid, or may be in a solid or powdered state. The active material 16 may be a substance that chemically reacts with the electrolyte, may be a substance that chemically reacts with the electrode assembly 12, or may be a substance that chemically reacts with both the electrolyte and the electrode assembly 12. The active material 16 may be an oxidizing agent, or may be another substance that can chemically react with the electrolyte and / or the electrode assembly 12, generate a large amount of high-temperature and high-pressure gas, and crush the electrode assembly 12.

[0081] In the battery cell 10 of the embodiment of the present application, the active material 16 is packaged in the vicinity of the pressure relief member 13. When a thermal runaway occurs at a certain site inside the battery cell 10, the packaging member 15 operates to release the active material 16 before the internal temperature or pressure of the battery 100 reaches the operating threshold value of the pressure relief member 13, causing a thermal runaway to occur on the side of the electrode assembly 12 close to the pressure relief member 13. The electrode assembly is crushed and decomposed, and a large amount of high-temperature and high-pressure gas is generated accordingly, rapidly increasing the temperature or pressure in the vicinity of the pressure relief member 13 and operating the pressure relief member 13 to release the internal pressure or temperature of the battery cell 10. In particular, when the thermal runaway site of the battery cell 10 is relatively far from the pressure relief member 13, by releasing the active material 16 inside the battery cell 10, it can be ensured that when a thermal runaway occurs inside the battery cell 10, the pressure relief member 13 operates effectively, and the internal pressure or temperature of the battery cell 10 can be smoothly released, giving the battery cell 10 relatively high safety performance.

[0082] As shown in FIG. 3, in some embodiments of the present application, the outer casing 11 includes a housing 111 and an end cover 112. The housing 111 has an opening 113. The housing 111 includes a side wall 1112 and a bottom wall 1111. The bottom wall 1111 is disposed opposite to the opening 113. The end cover 112 is connected to the side wall 1112 and covers the opening 113. The first wall is the end cover 112, the bottom wall 1111 or the side wall 1112.

[0083] Specifically, the bottom wall 1111 and the opening 113 are disposed opposite to each other in the second direction Z. The thickness direction of the end cover 112 extends along the second direction Z. The end cover 112 is connected to the edge of the side wall 1112 away from the bottom wall 1111 and covers the opening 113 to confine the electrode assembly 12 inside the outer casing 11.

[0084] As can be understood, the positions of the bottom wall 1111, the side wall 1112 and the end cover 112 are related to the placement state of the battery cell 10.

[0085] In some embodiments of the present application, the second direction Z extends along the vertical direction. The battery cell 10 is placed upright. The first wall is the end cover 112. The pressure relief hole 1121 is disposed facing upward. The pressure relief member 13 is located above the battery cell 10. The bottom wall 1111 is located at the bottom side of the battery cell 10. When thermal runaway occurs inside the battery cell 10, the thermal runaway site may be inside the electrode assembly 12 or may be close to the surface of the electrode assembly 12. Also, it may be in a portion close to the bottom wall 1111 or the side wall 1112 of the electrode assembly 12, or may be in a portion close to the end cover 112. In particular, when thermal runaway occurs at a position close to the bottom wall 1111 of the electrode assembly 12, the exhaust passage from the side close to the bottom wall 1111 of the electrode assembly 12 to the pressure relief member 13 is not smooth. By operating the packaging member 15 earlier before the pressure relief member 13 operates, the electrode assembly 12 is pushed upward by a local air pressure action, and the top of the electrode assembly 12 is in close contact with the end cover 112 to block the pressure relief hole 1121, so that it can be avoided that the pressure relief member 13 cannot operate effectively.

[0086] In other embodiments, depending on the placement state of the battery cell 10 and the placement position of the first wall, the pressure relief hole 1121 may be opened along the horizontal direction or installed facing downward. The packaging member 15 can ensure the effective operation of the pressure relief member 13 by operating early to release the active material 16.

[0087] In the above aspect, the first wall is the end cover 112, the bottom wall 1111, or the side wall 1112, and the pressure relief member 13 is provided on the first wall. When thermal runaway occurs at a certain part inside the battery cell 10, the packaging member 15 operates to release the active material 16 before the internal temperature or pressure of the battery 100 reaches the operating threshold of the pressure relief member 13. The part of the electrode assembly 12 close to the pressure relief member 13 is crushed and decomposed by a chemical reaction, and a large amount of high-temperature and high-pressure gas is generated along with the chemical reaction, thereby rapidly increasing the temperature or pressure near the pressure relief member 13 to operate the pressure relief member 13, and releasing the internal pressure or temperature of the battery cell 10.

[0088] In some embodiments of the present application, the pressure relief member 13 is configured to operate to release pressure when the internal pressure or temperature of the battery cell 10 reaches a second threshold, and the second threshold is greater than the first threshold.

[0089] The specific implementation forms in which the pressure relief member 13 operates when the internal pressure of the battery cell 10 reaches the second threshold are various. The pressure relief member 13 may be a metal piece with a cut on its surface, or a polymer film with a locally reduced thickness. When the internal pressure of the battery cell 10 reaches the second threshold, the cut or the locally thinned area ruptures to release the internal pressure of the battery cell 10. The edge of the pressure relief member 13 may be adhered to the first wall, or a sealing member or the like may be adopted to clamp it to the first wall. When the internal pressure of the battery cell 10 reaches the second threshold, the edge of the pressure relief member 13 separates from the first wall to release the internal pressure of the battery cell 10.

[0090] In other embodiments, the pressure relief member 13 may operate when the internal temperature of the battery cell 10 reaches the operating threshold value, and the operating temperature threshold value of the pressure relief member 13 is higher than the temperature inside the battery cell 10 when the packaging member 15 operates.

[0091] Both the pressure relief member 13 and the packaging member 15 adopt a pressure rupture operation, and by making the operating threshold value of the pressure relief member 13 larger than the operating threshold value of the packaging member 15, it is ensured that the packaging member 15 operates before the pressure relief member 13, so that the internal pressure of the battery cell 10 can be released by the pressure relief member 13, giving the battery cell 10 relatively good safety performance.

[0092] In some embodiments of the present application, the active material 16 may be an oxidizing agent.

[0093] The oxidizing agent can react with the electrolyte and / or the electrode plate in the electrode assembly 12, generate a large amount of high-temperature and high-pressure gas, and crush the electrode plate.

[0094] By adopting an oxidizing agent to react with the electrode assembly 12 and / or the electrolyte, the reaction is rapid and intense, the electrode assembly 12 can be crushed and decomposed, and a large amount of high-temperature and high-pressure gas is generated accordingly, ensuring that the pressure relief member 13 is activated, and the pressure or temperature at the thermal runaway site inside the battery cell 10 can be smoothly discharged through the pressure relief member 13.

[0095] In some embodiments of the present application, the active material 16 includes at least one of potassium permanganate, potassium dichromate, sodium hypochlorite, oxydol, lead dioxide, periodic acid, cobalt trifluoride, and sodium ferrate.

[0096] The active material 16 may be a single type of oxidizing agent or a mixture of multiple oxidizing agents. When the active material 16 is separated and stored by different storage cavities, the active material 16 in different storage cavities may be the same or different.

[0097] The active material 16 of the above type does not react with the outer casing 11 and the packaging member 15, is a common oxidant, is easily available, and has a low cost.

[0098] In some embodiments of the present application, the packaging member 15 packages at least a part of the active material 16 at a position corresponding to the pressure release member 13.

[0099] All of the active material 16 may be packaged at positions corresponding to the pressure release member 13. For the active material 16 to cause a chemical reaction at a portion close to the pressure release member 13 of the electrode assembly 12, a part of it may be packaged at a position corresponding to the pressure release member 13, and another part may be packaged at another position close to the first wall of the electrode assembly 12 for causing a chemical reaction at another position close to the first wall of the electrode assembly 12.

[0100] The active material 16 not only causes a chemical reaction at a position near the pressure release member 13 to activate the pressure release member 13, but also causes a chemical reaction at other positions inside the battery cell 10 to crush the corresponding electrode assembly 12, thereby smoothing the exhaust passage from the thermal runaway site of the battery cell 10 to the pressure release member 13 and ensuring that the gas generated at the thermal runaway site of the battery cell 10 can be smoothly discharged through the pressure release member 13.

[0101] FIG. 4 shows a schematic diagram of a structure in which an electrode terminal, a pressure release member, and a packaging member are connected to an end cover of a battery cell in FIG. 3, and FIG. 5 is a cross-sectional view taken along line A-A in FIG. 4.

[0102] As shown in FIGS. 4 and 5, in some embodiments of the present application, a pressure release hole 1121 is provided in the outer casing 11, both the pressure release member 13 and the packaging member 15 cover the pressure release hole 1121, the packaging member 15 is installed on the side of the pressure release member 13 close to the electrode assembly 12, and the packaging member 15, the pressure release member 13, and the hole wall 11211 of the pressure release hole 1121 together define a sealed space for accommodating the active material 16.

[0103] As shown in FIGS. 3, 4, and 5, in the "the first wall is the end cover 112" embodiment described above, both sides of the end cover 112 in the second direction Z are the first side 1122 and the second side 1123 respectively. The first side 1122 is installed close to the electrode assembly 12 and is located inside the battery cell 10, and the second side 1123 is away from the electrode assembly 12 and is located outside the battery cell 10. The pressure release member 13 is installed close to the second side 1123, the packaging member 15 is installed close to the first side 1122, and the pressure release member 13, the packaging member 15, and the hole wall 11211 of the pressure release hole 1121 together define a sealed space.

[0104] In the thickness direction of the end cover 112, the pressure release member 13 is installed inside the pressure release hole 1121, the edge of the pressure release member 13 is connected to the inner wall of the pressure release hole 1121, the packaging member 15 is located outside the pressure release hole 1121, and the packaging member 15 is connected to the surface of the pressure release hole 1121 close to the first side 1122.

[0105] As shown in FIG. 5, the end cover 112 further includes a first portion 1124 and a second portion 1125. The first portion 1124 protrudes from the hole wall 11211 of the pressure release hole 1121 to the surface of the first wall, and the second portion 1125 protrudes from the first side 1122 to the surface of the first wall. The edge of the pressure release member 13 is connected to the first portion 1124, the packaging member 15 is connected to the second portion 1125, and the first portion 1124, the second portion 1125, the pressure release member 13, and the packaging member 15 together define a sealed space 1126.

[0106] In other embodiments, the pressure relief member 13 and the packaging member 15 have various ways of covering the pressure relief hole 1121. For example, the pressure relief member 13 and the packaging member 15 are respectively connected to the end cover 112 from the first side 1122 and the second side 1123 of the end cover 112 in the second direction Z. Further for example, the pressure relief member 13 is installed inside the pressure relief hole 1121, the area of the packaging member 15 is larger than the area of the pressure relief hole 1121, the packaging member 15 covers the pressure relief hole 1121 from the first side 1122 of the end cover 112, and the edge of the packaging member 15 is connected to the surface of the end cover 112.

[0107] The active material 16 is packaged in the pressure relief hole 1121 and does not overly occupy the internal space of the battery cell 10, thereby maintaining the original energy density of the battery cell 10. And the packaging member 15 releases the active material 16 when operating, the active material 16 can undergo a chemical reaction at a position close to the pressure relief hole 1121, can surely activate the pressure relief member 13, and enables the battery cell 10 to have relatively good safety performance.

[0108] As shown in FIG. 5, in some embodiments of the present application, both the pressure relief member 13 and the packaging member 15 are in sheet form.

[0109] Both the pressure relief member 13 and the packaging member 15 are in sheet form and occupy a relatively small space in the pressure relief hole 1121, so more space in the pressure relief hole 1121 can be used to store the active material 16.

[0110] FIG. 6 shows a schematic diagram of the structure of a second type of battery cell according to some embodiments of the present application.

[0111] As shown in FIG. 6, in some embodiments of the present application, the packaging member 15 is made of an insulating material and is installed between the first wall and the electrode assembly 12 so as to insulate and isolate the electrode assembly 12 from the first wall.

[0112] According to the above-described embodiment of "the first wall is the end cover 112", the packaging member is disposed between the end cover 112 and the electrode assembly 12 so as to insulate and isolate the electrode assembly 12 and the end cover 112.

[0113] The packaging member 15 may be a plastic member, and may be configured to dissolve and release the active material 16 when the temperature inside the battery 100 reaches a first threshold value. The packaging member 15 may have a locally weakened portion that breaks when the pressure inside the battery 100 reaches a first threshold value. The packaging member 15 further includes through holes corresponding to the electrode lead-out hole and the pressure release hole 1121 in order to connect the electrode terminal 14 to the current collecting component and communicate the pressure release hole 1121 with the accommodation cavity inside the battery cell 10.

[0114] The packaging member 15 is not only used to package the active material 16, but also further used to insulate and isolate the electrode assembly 12 and the first wall. By integrating the insulation function and the packaging function of the active material 16 in the packaging member 15, the number of components inside the battery cell 10 is reduced, the structure of the battery cell 10 is made more compact, and a relatively high energy density is achieved.

[0115] FIG. 7 shows a schematic diagram of a structure in which an electrode terminal, a pressure release member, and a packaging member are connected to an end cover of a battery cell in FIG. 6, and FIG. 8 is a cross-sectional view taken along line B-B in FIG. 7.

[0116] As shown in FIGS. 7 and 8, in some embodiments of the present application, the packaging member 15 has a first accommodation cavity 1512 corresponding to the position of the pressure release member 13, and at least a part of the active material 16 is packaged in the first accommodation cavity 1512.

[0117] All of the active material 16 may be packaged in the first accommodation cavity 1512, or a part may be packaged in the first accommodation cavity 1512 and the remaining part may be packaged at other positions.

[0118] The first accommodation cavity 1512 may be formed by the packaging member 15 and other members surrounding each other, or may exist independently inside the packaging member 15.

[0119] The projection of the pressure release hole 1121 onto the XY plane may enter the projection of the first accommodation cavity 1512 onto the XY plane. Thereby, the active material 16 released into the first accommodation cavity 1512 undergoes a chemical reaction in a relatively large area near the pressure release member 13, rapidly generating a large amount of gas and activating the pressure release member 13. The projection of the first accommodation cavity 1512 onto the XY plane may enter the projection of the pressure release hole 1121 onto the XY plane, or the projection of the first accommodation cavity 1512 onto the XY plane may overlap with the projection portion of the pressure release hole 1121 onto the XY plane. Thereby, the storage position of the active material 16 can be flexibly arranged according to the space inside the battery cell 10, and it is sufficient if the pressure release member 13 can be activated by the large amount of gas generated by the chemical reaction caused by the active material 16 when the packaging member 15 operates.

[0120] The packaging member 15 can release the active material 16 in the first accommodation cavity 1512 when operating, cause a chemical reaction near the pressure release member 13, surely activate the pressure release member 13, and endow the battery cell 10 with relatively good safety performance.

[0121] FIG. 9 is a partially enlarged view of part C in FIG. 8, and FIG. 9 shows a schematic diagram of the structure of the first accommodation cavity of the first type of battery cell in FIG. 6.

[0122] As shown in FIG. 9, in some embodiments of the present application, the first accommodation cavity 1512 has a first opening, and the first wall and the pressure release member 13 both close the first opening.

[0123] In the implementation form of "the first wall is the end cover 112", in the first direction X, a first concave groove 151 is installed at the central position of the packaging member 15. The first concave groove 151 is formed by being recessed in the direction in which the surface of the packaging member 15 separates from the end cover 112. The inside of the first concave groove 151 has a first accommodation cavity 1512, and the opening on the side of the first concave groove 151 close to the end cover 112 the mouth , constitutes a first opening, the projection of the pressure release member 13 onto the XY plane falls within the projection of the first concave groove 151 onto the XY plane, and the first side 1122 of the end cover 112 is in close contact with the packaging member 15 and closes the first opening to form a sealed first accommodation cavity 1512.

[0124] FIG. 10 shows a schematic diagram of the structure of the first accommodation cavity of the second form of the battery cell in FIG. 6.

[0125] As shown in FIG. 10, specifically, the middle part of the first concave groove 151 is further recessed in the direction away from the end cover 112 to form a storage part 1513. The storage part 1513 is used for storing the active material 16, so that more active material 16 is stored corresponding to the vicinity of the pressure release member 13. The projection of the storage part 1513 onto the XY plane falls within the projection of the pressure release member 13 onto the XY plane. During the operation of the packaging member 15, the chemical reaction in the part near the pressure release member 13 is prioritized, and the speed of operating the pressure release member 13 can be increased. One side of the storage part away from the end cover 112 may be used to abut against the surface of the electrode assembly 12, whereby both sides of the packaging member 15 are abutted between the end cover 112 and the electrode assembly 12, and the structure of the battery cell 10 is made more compact.

[0126] FIG. 11 shows a schematic diagram of the structure of the first accommodation cavity of the third form of the packaging member of the battery cell in FIG. 6, and FIG. 12 shows a schematic diagram of the structure of the packaging member in FIG. 11.

[0127] As shown in FIGS. 11 and 12, in other embodiments, the first accommodation cavity 1512 may be a sealed space independently formed inside the packaging member 15, and the active material 16 is packaged inside the first accommodation cavity 1512 by adopting a form of composite injection molding. Specifically, the support portion 154 is provided in a through hole corresponding to the pressure release hole 1121 in the packaging member 15. The support portion 154 closes a part of the through hole and exposes the spaces on both sides of the through hole in the first direction X, forming two exhaust spaces 155. One side of the support portion 154 communicates with the inside of the battery cell 10 by contacting the pressure release member 13, thereby connecting the two exhaust spaces 155. The support portion 154, together with the storage portion 1513 of the first concave groove 151, surrounds and seals to form the first accommodation cavity 1512, and the active material 16 is packaged inside the first accommodation cavity 1512.

[0128] The first wall, the pressure release member 13, and the packaging member 15 together form a sealed first accommodation cavity 1512, which not only packages the active material 16 near the pressure release member 13, but also allows the active material 16 to undergo a chemical reaction near the pressure release member 13 when released, and easily realizes the packaging of the active material 16.

[0129] FIG. 13 is a partially enlarged view of part D in FIG. 8.

[0130] As shown in FIGS. 8 and 13, in some embodiments of the present application, the first wall is rectangular, the packaging member 15 further has two second accommodation cavities 1522, and in the longitudinal direction of the first wall, the two second accommodation cavities 1522 are respectively located on both sides of the first accommodation cavity 1512. A part of the active material 16 is packaged inside the first accommodation cavity 1512, and another part is packaged inside the two second accommodation cavities 1522.

[0131] In the implementation form of "the first wall is the end cover 112", the end cover 112 is a rectangle whose longitudinal direction extends along the first direction X and whose width direction extends along the third direction Y. In the first direction, one second accommodation cavity 1522 is respectively installed at both ends of the packaging member 15. The second accommodation cavity 1522 may be a sealed space independently formed inside the packaging member 15, and the active material 16 is packaged inside the second accommodation cavity 1522 by adopting the form of composite injection molding. The second accommodation cavity 1522 may also be a sealed space formed by the packaging member 15 and the end cover 112 surrounding each other.

[0132] In the longitudinal direction of the first wall, one second accommodation cavity 1522 is respectively provided on both sides of the first accommodation cavity 1512. A part of the active material 16 is packaged in the second accommodation cavity 1522. When the active material 16 in the second accommodation cavity 1522 is released, a chemical reaction occurs at the corresponding position of the electrode assembly 12, and the side close to the pressure release member 13 of the electrode assembly 12 can be sufficiently crushed, so as to maintain the exhaust passage from the thermal runaway part of the battery cell 10 to the pressure release member 13 to be smooth.

[0133] As shown in FIG. 13, in some embodiments of the present application, the second accommodation cavity 1522 has a second opening, and the first wall closes the second opening.

[0134] Specifically, in the first direction, one second concave groove 152 is respectively provided at both ends of the packaging member 15. The second concave groove 152 is recessed in the direction in which the surface of the packaging member 15 separates from the end cover 112. The inside of the second concave groove 152 has the second accommodation cavity 1522, and the opening of the second concave groove 152 close to the end cover 112 the mouth , constitutes the second opening. The packaging member 15 is in close contact with the end cover 112 and closes the second opening to form a sealed second accommodation cavity 1522.

[0135] The second accommodation cavity 1522 may have the same size as the electrode assembly 12 along the third direction Y, and can crush and decompose the corner parts at both ends in the first direction X on the side close to the end cover 112 of the electrode assembly 12, and smooth the exhaust passage from the thermal runaway part of the electrode assembly 12 to the pressure relief member 13. The second accommodation cavity 1522 may be installed centrally with respect to the electrode assembly 12 along the third direction Y.

[0136] Specifically, on both sides of the packaging member 15 in the first direction X, there are connection parts 153 that abut against the surface of the electrode assembly 12. The connection parts 153 are formed by the side away from the end cover 112 of the packaging member 15 protruding along the second direction Z. The second concave groove 152 is formed inside the connection part 153 to compact the structure of the packaging member 15.

[0137] The first wall and the packaging member 15 together form a sealed second accommodation cavity 1522. When the active material 16 is released, a chemical reaction can occur at the corresponding position, and it is easy to package the active material 16.

[0138] Some embodiments of the present application propose a battery 100. This battery 100 includes the battery cells 10 of some embodiments of the present application.

[0139] Due to the characteristics of the battery cell 10, the battery 100 of some embodiments of the present application also has relatively good safety performance.

[0140] Some embodiments of the present application propose a power consumption device, which includes the battery 100.

[0141] Due to the characteristics of the battery 100, the power consumption device of some embodiments of the present application also has relatively good safety performance.

[0142] Some embodiments of the present application propose a manufacturing method for the battery cell 10. This manufacturing method for the battery cell 10 is Providing an outer casing 11 with a pressure - releasing member 13 installed on a first wall; Providing an electrode assembly 12; Providing an electrolytic solution; Providing a packaging member 15 and an active material 16, where the packaging member 15 is used to package the active material 16, the packaging member 15 is configured to operate and release the active material 16 when the internal pressure or temperature of the battery cell 10 reaches a first threshold value, the active material 16 is capable of reacting with the electrolytic solution and / or the electrode assembly 12, and by increasing the internal pressure or temperature of the battery cell 10, the pressure - releasing member 13 is actuated; Installing the electrode assembly 12 inside the outer casing 11, packaging the active material 16 using the packaging member 15 on the side close to the first wall of the electrode assembly 12, and injecting the electrolytic solution into the outer casing 11.

[0143] Some embodiments of the present application propose manufacturing equipment for the battery cell 10. This manufacturing equipment for the battery cell 10 includes A first providing device for providing an outer casing 11 with a pressure - releasing member 13 installed on a first wall; A second providing device for providing an electrode assembly 12; A third providing device for providing an electrolytic solution; A fourth providing device for providing a packaging member 15 and an active material 16, where the packaging member 15 is used to package the active material 16, the packaging member 15 is configured to operate and release the active material 16 when the internal pressure or temperature of the battery cell 10 reaches a first threshold value, the active material 16 is capable of reacting with the electrolytic solution and / or the electrode assembly 12, and by increasing the internal pressure or temperature of the battery cell 10, the pressure - releasing member 13 is actuated; An attachment module for installing the electrode assembly 12 inside the outer casing 11, packaging the active material 16 using the packaging member 15 on the side close to the first wall of the electrode assembly 12, and injecting the electrolytic solution into the outer casing 11.

[0144] As shown in FIGS. 3 to 5, some embodiments of the present application propose a battery cell 10. The battery cell 10 includes a housing 111, an end cover 112, an electrode assembly 12, a pressure relief member 13, and a packaging member 15. A pressure relief hole 1121 is provided in the end cover 112, and an explosion-proof sheet with a two-layer structure is installed in the pressure relief hole 1121. The upper-layer explosion-proof sheet is the pressure relief member 13, and the lower-layer explosion-proof sheet is the packaging member 15. The explosion-proof sheet is generally made of a metal material, such as aluminum, steel, etc., or may be made of a plastic material. An active material 16 is added between the upper and lower explosion-proof sheets. The active material 16 is generally a strong oxidant, such as potassium permanganate, potassium dichromate, sodium hypochlorite, oxidol, lead dioxide, periodic acid, cobalt trifluoride, sodium ferrate, etc. When gas gradually generates due to thermal runaway inside the battery cell, the internal air pressure reaches a first threshold value, which is lower than the opening pressure of the upper-layer explosion-proof sheet. The air pressure inside the battery cell pushes open the lower-layer explosion-proof sheet, releases the active material 16 to react with the electrolyte, invalidates the electrode assembly near the pressure relief member 13, generates a large amount of high-temperature and high-pressure gas, further breaks through the upper-layer explosion-proof sheet, releases heat, and at the same time ejects the crushed and decomposed electrode plate, increases the exhaust gap at the pressure relief hole 1121, and can smoothly discharge the invalidated electrode plate when the electrode assembly far from the pressure relief hole 1121 becomes invalid. Thereby, it can prevent the electrode assembly 12 from being pushed upward due to the opening failure of the pressure relief member 13, causing the battery cell 10 to explode and a major safety accident to occur.

[0145] As shown in FIGS. 6 to 13, some embodiments of the present application propose a battery cell 10. The battery cell 10 includes a housing 111, an end cover 112, an electrode assembly 12, a pressure relief member 13, and a packaging member 15. The pressure relief member 13 is provided on the end cover 112. The packaging member 15 is below sideIt is made of plastic and is installed between the end cover 112 and the electrode assembly 12. Along the longitudinal direction of the end cover 112 (i.e., the first direction X), the length of the packaging member 15 is approximately the same as the length of the electrode assembly 12. There are semi-open concave grooves in the middle and both ends of the packaging member 15. The packaging member 15 is in close contact with the end cover 112 to package the active material 16 inside the concave grooves. When gas is generated inside the battery cell 10 and the temperature rises, the of the side plastic is melted, the active material 16 is released and reacts with the electrode assembly, discharging the electrode plate relatively close to the pressure release hole 1121, creating an exhaust gap to prevent the end cover 112 from exploding out of the housing 111.

[0146] It should be noted that unless they collide, the features in the embodiments of this application may be combined with each other.

[0147] The above are the preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application can be subject to various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the scope of the spirit and principle of this application should all be included within the protection scope of this application.

Description of Reference Numerals

[0148] 1000 Vehicle 100 Battery 10 Battery Cell 11 Outer Housing 111 Housing 1111 Bottom Wall 1112 Side Wall 112 End Cover 1121 Pressure Release Hole 11211 Hole Wall 1122 First Side 1123 Second Side 1124 First Portion 1125 Second Portion 1126 Sealed Space 113 Opening 12 Electrode Assembly 121 body 122 tab 13 pressure release member 14 electrode terminal 15 packaging member 151 first concave groove 1512 first accommodation cavity 1513 storage part 152 second concave groove 1522 second accommodation cavity 153 connection part 154 support part 155 exhaust space 16 active material 20 housing 21 first housing 22 second housing 200 controller 300 motor

Claims

1. A battery cell, comprising: an outer casing having a rectangular first wall; a pressure relief member installed on the first wall; an electrode assembly installed inside the outer casing; an electrolyte in which the electrode assembly is immersed; a packaging member and an active material installed inside the outer casing, wherein the packaging member is used to package the active material on a side close to the first wall of the electrode assembly, and the packaging member is configured to operate when the internal pressure or temperature of the battery cell reaches a first threshold value to release the active material, and the active material is capable of chemically reacting with the electrolyte and / or the electrode assembly, and includes a packaging member and an active material that operate the pressure relief member by increasing the internal pressure or temperature of the battery cell; the packaging member has a first accommodation cavity corresponding to the position of the pressure relief member and two second accommodation cavities, and in the longitudinal direction of the first wall, the two second accommodation cavities are respectively located on both sides of the first accommodation cavity; a part of the active material is packaged in the first accommodation cavity, and another part is packaged in the two second accommodation cavities, characterized in that it is a battery cell.

2. The pressure relief member is configured to operate to release pressure when the internal pressure or temperature of the battery cell reaches a second threshold value, and the second threshold value is greater than the first threshold value, characterized in that it is the battery cell according to claim 1.

3. The active material is an oxidizing agent, characterized in that it is the battery cell according to claim 1 or 2.

4. The active material includes at least one of potassium permanganate, potassium dichromate, sodium hypochlorite, oxydol, lead dioxide, periodic acid, cobalt trifluoride, and sodium ferrate, characterized in that it is the battery cell according to claim 3.

5. A pressure relief hole is installed in the outer casing, and both the pressure relief member and the packaging member cover the pressure relief hole. The packaging member is installed on a side close to the electrode assembly of the pressure relief member. The packaging member, the pressure relief member, and the hole wall of the pressure relief hole together define a sealed space for accommodating the active material, characterized in that it is the battery cell according to claim 1.

6. The pressure release member and the packaging member are both in the form of sheets. The battery cell according to claim 5, wherein the battery cell is characterized in that

7. The packaging member is made of an insulating material, and the packaging member is installed between the first wall and the electrode assembly so as to insulate and isolate the electrode assembly from the first wall. The battery cell according to claim 1, wherein the battery cell is characterized in that

8. The first accommodation cavity has a first opening, and the first wall and the pressure release member both close the first opening. The battery cell according to claim 1, wherein the battery cell is characterized in that

9. The second accommodation cavity has a second opening, and the first wall closes the second opening. The battery cell according to claim 1, wherein the battery cell is characterized in that

10. The outer casing includes a housing and an end cover. The housing has an opening, the housing includes a side wall and a bottom wall, the bottom wall is installed opposite to the opening, the end cover is connected to the side wall and covers the opening, and the first wall is the end cover, the bottom wall or the side wall. The battery cell according to any one of claims 1 to 9, wherein the battery cell is characterized in that

11. A battery comprising the battery cell according to any one of claims 1 to 10. The battery is characterized in that

12. An electric power consumption device comprising the battery according to claim 11. The electric power consumption device is characterized in that

13. A method for manufacturing a battery cell, comprising: providing an outer casing in which a pressure release member is installed on a rectangular first wall; providing an electrode assembly; providing an electrolytic solution; providing a packaging member and an active material, wherein the packaging member is used to package the active material, the packaging member has a first accommodation cavity corresponding to the position of the pressure release member and two second accommodation cavities, in the longitudinal direction of the first wall, the two second accommodation cavities are respectively located on both sides of the first accommodation cavity, the packaging member is configured to operate to release the active material when the internal pressure or temperature of the battery cell reaches a first threshold value, the active material can chemically react with the electrolytic solution and / or the electrode assembly, and the pressure release member is operated by increasing the internal pressure or temperature of the battery cell. A method for manufacturing a battery cell, comprising installing the electrode assembly in the outer casing, packaging the active material using the packaging member on a side closer to the first wall of the electrode assembly, packaging a part of the active material in the first accommodation cavity, packaging another part in the two second accommodation cavities, and injecting the electrolyte into the outer casing.

14. Manufacturing equipment for a battery cell, comprising a first providing device for providing an outer casing with a pressure relief member installed on a rectangular first wall; a second providing device for providing an electrode assembly; a third providing device for providing an electrolyte; a fourth providing device for providing a packaging member and an active material, wherein the packaging member is used for packaging the active material, the packaging member has a first accommodation cavity corresponding to the position of the pressure relief member and two second accommodation cavities, in the longitudinal direction of the first wall, the two second accommodation cavities are respectively located on both sides of the first accommodation cavity, the packaging member is configured to operate to release the active material when the internal pressure or temperature of the battery cell reaches a first threshold value, the active material is capable of chemically reacting with the electrolyte and / or the electrode assembly, and the fourth providing device for operating the pressure relief member by increasing the internal pressure or temperature of the battery cell; an attachment module for installing the electrode assembly in the outer casing, packaging the active material using the packaging member on a side closer to the first wall of the electrode assembly, packaging a part of the active material in the first accommodation cavity, packaging another part in the two second accommodation cavities, and injecting the electrolyte into the outer casing, characterized in that it is manufacturing equipment for a battery cell.

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