Shell, battery monomer, battery and electric equipment

Abstract

The utility model discloses a shell, a battery monomer, a battery and electric equipment, the shell comprises a first wall, and a through hole is formed in the first wall along the thickness direction of the first wall; an anti-explosion valve is arranged at a first opening of the through hole in a sealed mode, and a cover piece is arranged at a second opening of the through hole in a sealed mode. A sealed containing space is defined by the through hole, the anti-explosion valve and the cover piece, and a warning object is arranged in the containing space. When a trigger condition is reached, the explosion-proof valve and the cover plate are both broken, so that the warning object leaks out of the shell from the accommodating space. In this way, when the temperature and the internal air pressure of the battery are large, triggering conditions can be met, the explosion-proof valve and the cover piece are both broken through the rapidly-expanded air pressure, the warning object in the containing space is rapidly leaked out of the shell, and the leaked warning object plays a warning role so as to be obviously recognized; when a safety test is carried out on the single battery or the battery, whether the anti-explosion valve is opened or not is judged by identifying whether the warning object leaks or not, so that the valve opening time of the anti-explosion valve is accurately obtained.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically to a housing, a battery cell including the aforementioned housing, a battery including the aforementioned battery cell, and an electrical device including the aforementioned battery cell or battery. Background Technology

[0002] During battery safety testing, the explosion-proof valve will open when the battery temperature and internal pressure are high. Since the opening of the explosion-proof valve does not cause significant fluctuations in current and voltage, judging the valve's opening time based on the relationship between voltage and current or voltage abrupt changes is likely to lead to misjudgment. When the valve's opening size is small, the sound of the valve bursting is quiet and difficult to hear, and the rate of gas leakage inside the battery is slow and difficult to observe; therefore, the valve's opening time cannot be accurately determined. Utility Model Content

[0003] In view of this, this application provides a housing, a battery cell including the housing, a battery including the battery cell, and an electrical device including the battery cell or battery, which solves the problem of not being able to accurately obtain the opening time of the explosion-proof valve.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A housing includes a first wall, and a through hole is formed in the first wall along its thickness direction; an explosion-proof valve is sealed at a first opening of the through hole, and a cover is sealed at a second opening of the through hole; the through hole, the explosion-proof valve, and the cover form a sealed accommodating space, and a warning object is placed in the accommodating space;

[0006] When the triggering condition is met, both the explosion-proof valve and the cover plate rupture, causing the warning object to leak from the accommodating space to the outside of the housing.

[0007] Optionally, in the above-described housing, the second opening is formed on the outer surface of the first wall;

[0008] The cover has an injection hole for injecting the warning substance through the injection hole;

[0009] A sealing element is provided at the injection hole to block the injection hole.

[0010] Optionally, in the above-described housing, the sealing element is an adhesive element that is bonded to the cover plate.

[0011] Optionally, in the housing described above, an adhesive layer is provided between the cover and the seal along the circumferential direction of the seal.

[0012] Optionally, in the aforementioned housing, the warning object is placed inside a packaging container, and the packaging container is disposed within the accommodating space;

[0013] When the target temperature is exceeded, the packaging container decomposes and releases the warning substance, wherein the target temperature is less than or equal to the temperature at which the trigger condition is reached.

[0014] Optionally, in the aforementioned housing, the volume of the accommodating space is 0.3 cm³. 3 -10cm 3 .

[0015] Optionally, in the aforementioned housing, the warning substance is at least one of a colored gas, a gas that changes color upon contact with air, and a gas with an odor.

[0016] A battery cell includes a housing as described above and a cell located inside the housing.

[0017] A battery comprising at least two battery cells as described above, wherein different warning objects are disposed within the accommodating space of the different battery cells.

[0018] An electrical device includes a battery cell as described above, or includes a battery as described above.

[0019] The housing, battery cell, battery, and electrical equipment provided in this application have a through hole in the first wall of the housing. An explosion-proof valve is installed at the first opening of the through hole, and a cover is installed at the second opening of the through hole. The through hole, the explosion-proof valve, and the cover form a sealed accommodating space, and a warning object is placed in the accommodating space. When the battery temperature and internal gas pressure are high, the trigger condition is reached. The rapidly expanding gas pressure causes the explosion-proof valve and the cover to rupture, and the warning object in the accommodating space quickly leaks out of the housing. The leaked warning object serves as a warning and can be clearly identified. As described above, when conducting safety tests on the battery cell or battery, the opening of the explosion-proof valve is determined by identifying whether the warning object leaks, thereby accurately obtaining the opening time of the explosion-proof valve. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1This is a schematic diagram of the structure of the first wall of the shell in this application;

[0022] Figure 2 This is a schematic diagram of the structure of the first wall of the shell in this application;

[0023] Figure 3 This is a schematic diagram of the structure of the first wall of the shell in this application.

[0024] Figures 1-3 middle:

[0025] 1. First wall; 2. Explosion-proof valve; 3. Cover plate; 4. Seal; 5. Encapsulation container;

[0026] 11. Through hole;

[0027] 31. Injection hole. Detailed Implementation

[0028] This application provides a housing, a battery cell including the housing, a battery including the battery cell, and an electrical device including the battery cell or battery. A through-hole is formed in the first wall of the housing. An explosion-proof valve is installed at the first opening of the through-hole, and a cover is installed at the second opening of the through-hole. The through-hole, the explosion-proof valve, and the cover form a sealed accommodating space, and a warning object is placed within the accommodating space. When the battery temperature and internal gas pressure are high, a trigger condition is reached. The rapidly expanding gas pressure causes the explosion-proof valve and the cover to rupture, and the warning object in the accommodating space quickly leaks out of the housing. The leaked warning object serves as a warning and can be clearly identified. As described above, when performing safety tests on the battery cell or battery, the opening of the explosion-proof valve can be determined by identifying whether the warning object leaks, thus accurately determining the opening time of the explosion-proof valve.

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] like Figure 1-3 This application discloses a housing, which includes a first wall 1. A through hole 11 is formed in the first wall 1 along its thickness direction. An explosion-proof valve 2 is sealed at the first opening of the through hole 11, and a cover plate 3 is sealed at the second opening of the through hole 11. The through hole 11, the explosion-proof valve 2, and the cover plate 3 form a sealed accommodating space, within which a warning object is placed. When a triggering condition is met, both the explosion-proof valve 2 and the cover plate 3 rupture, allowing the warning object to leak from the accommodating space to the outside of the housing.

[0031] It should be noted that the casing in this application is the casing of a single battery cell. The casing includes an outer shell with an opening at the top and a top cover that seals the top opening of the outer shell. The first wall 1 can be any wall of the outer shell or the top cover. Optionally, the first wall 1 is the top cover; as above, it is easier to identify and observe leakage warnings. The first opening of the through hole 11 is formed on the inner surface of the first wall 1, and the second opening of the through hole 11 is formed on the outer surface of the first wall 1; the inner surface of the first wall 1 refers to the surface near the internal center of the casing, and the outer surface of the first wall 1 refers to the surface away from the internal center of the casing.

[0032] "Reaching the trigger condition" refers to the conditions reached by the internal temperature and pressure of the casing that allow the explosion-proof valve 2 to burst. When the internal temperature and pressure of the casing rise to a certain level, the explosion-proof valve 2 bursts. Furthermore, the burst pressure of the explosion-proof valve 2 is 1.8 MPa-2.0 MPa; for example, the burst pressure of the explosion-proof valve 2 is any one of 1.8 MPa, 1.85 MPa, 1.9 MPa, 1.95 MPa, and 2.0 MPa. The bursting of the explosion-proof valve 2 is equivalent to the opening of the explosion-proof valve 2, and the bursting time of the explosion-proof valve 2 is equivalent to the opening time of the explosion-proof valve 2.

[0033] The warning substance can be any of solid, liquid, or gas, as long as it can rapidly leak from the containment space to the outside of the housing upon reaching the trigger condition and can be accurately identified by the human eye and / or sensors and / or imaging equipment. When the warning substance is solid, it can instantly change from a solid to a gaseous state upon triggering the condition and be rapidly released outside the housing; when the warning substance is liquid, it can instantly change from a liquid to a gaseous state upon triggering the condition and be rapidly released outside the housing. The leaking warning substance has identifiable physical properties, including but not limited to at least one of color and odor.

[0034] When the internal temperature and internal gas pressure of a battery cell are high, the trigger condition is reached. The rapidly expanding gas pressure inside the battery cell causes both the explosion-proof valve 2 and the cover 3 to rupture, and the warning material within the containment space quickly leaks out of the casing. The leaked warning material serves as a warning and is easily identifiable. As described above, the opening time of the explosion-proof valve can be accurately determined solely by identifying whether the warning material within the containment space leaks out of the casing (i.e., changes in the state around the cover 3). The determination of the opening time of the explosion-proof valve 2 no longer depends on the relationship between voltage and current, voltage abrupt changes, or the sound of the explosion-proof valve 2 rupturing. The gas leaking from the battery cell when the explosion-proof valve 2 ruptures makes the determination of the opening time easier to identify, more accurate, and more reliable. Using the casing of this application, the opening time of the explosion-proof valve 2 can be detected promptly and accurately during battery cell safety testing, effectively improving the accuracy of battery cell or battery safety testing. This application can be applied to cylindrical battery cells, square battery cells, or other battery cells with rigid casings and explosion-proof valves.

[0035] Please see the appendix Figure 2 In some embodiments of this application, a first opening is formed on the inner surface of the first wall 1, and a second opening is formed on the outer surface of the first wall 1. The cover 3 has an injection hole 31 for injecting a warning substance into the accommodating space through the injection hole 31. A sealing member 4 is provided at the injection hole 31 to block the injection hole 31.

[0036] By setting the injection hole 31, the warning material can be injected quickly and conveniently into the accommodating space; and by setting the sealing element 4 at the injection hole 31, the injection hole 31 is sealed and plugged, so that the warning material is sealed and stored in the accommodating space when the triggering condition is not reached, and no leakage occurs.

[0037] In some embodiments of this application, the seal 4 is an adhesive element that is bonded to the cover plate 3.

[0038] It should be noted that the outer surface of the first wall 1 includes a surrounding portion that surrounds the injection hole 31; in a cross-section perpendicular to the central axis of the injection hole 31, the area of ​​the adhesive is larger than the area of ​​the injection hole 31; the adhesive is bonded to the surrounding portion. Furthermore, the adhesive can be a sealing tape.

[0039] The adhesive can quickly seal the injection hole 31, making the operation convenient and fast.

[0040] In some embodiments, the seal 4 may be in other forms besides being an adhesive, such as a plug that can elastically deform to seal the internal space of the injection hole 31.

[0041] In some embodiments of this application, an adhesive layer is provided between the cover plate 3 and the seal 4 along the circumferential direction of the seal 4.

[0042] The outer surface of the first wall 1 includes a surrounding portion that surrounds the injection hole 31; the seal 4 is sealed on the surrounding portion, and an adhesive layer is provided between the surrounding portion and the seal 4. As described above, this further ensures the reliable fixing effect of the seal 4 on the first wall 1, thereby ensuring the sealing effect on the injection hole 31.

[0043] Furthermore, adhesive is poured between the seal and the surrounding portion along the circumference of the seal 4 to form an adhesive layer. The adhesive used to form the adhesive layer can be at least one of AB glue, hot melt adhesive, etc.

[0044] Please see the appendix Figure 3 In some embodiments of this application, the warning object is placed inside a packaging container 5, which is disposed within an accommodating space. When the target temperature is exceeded, the packaging container 5 decomposes and releases the warning object, where the target temperature is less than or equal to the temperature at which the trigger condition is reached.

[0045] It should be noted that the shape of the packaging container 5 is not specifically limited; optionally, the packaging container 5 is in the shape of an empty capsule. Furthermore, the packaging container 5 is made of a modified starch material that decomposes when the target temperature is exceeded. Alternatively, other materials capable of decomposing when the target temperature is exceeded can be selected to prepare the packaging container 5.

[0046] Furthermore, the target temperature is 40℃-60℃; for example, the target temperature is any one of 40℃, 45℃, 50℃, 55℃, and 60℃.

[0047] Furthermore, the warning substance is injected into the packaging container 5 through the needle of a syringe.

[0048] The packaging container 5 can be placed into the accommodating space during the manufacturing process of the battery cell. In this case, the explosion-proof valve 2 is first sealed at the first opening of the through-hole 11, then the packaging container 5 containing the warning substance is placed inside the through-hole 11, and finally the cover 3 is sealed at the second opening of the through-hole 11. Alternatively, the packaging container 5 can be placed into the accommodating space after the battery cell has been manufactured. In this case, the cover 3 is torn open, and then the packaging container 5 containing the warning substance is inserted into the through-hole 11 through the second opening. Finally, the cover 3 is sealed again at the second opening of the through-hole 11.

[0049] By incorporating the sealing container 5, the placement options for the warning item within the containment space are expanded. The sealing container 5 achieves a sealed containment effect for the warning item, minimizing leakage when placed within the containment space.

[0050] After intense charging and discharging, the battery temperature easily reaches the target temperature. At this point, the encapsulation container 5 melts, and the warning substance diffuses out from the encapsulation container 5, quickly filling the entire containment space. When the internal temperature and internal gas pressure of the battery continue to rise, the triggering condition is reached. The rapidly expanding gas pressure inside the battery causes the explosion-proof valve 2 and the cover 3 to rupture, and the warning substance in the containment space quickly leaks out of the casing. The leaked warning substance has a warning effect and can be clearly identified.

[0051] In some embodiments of this application, the volume of the accommodating space is 0.3 cm³. 3 -10cm 3 For example, the volume of the accommodating space can be 0.3 cm³. 3 0.5cm 3 1cm 3 2cm 3 3cm 3 4cm 3 5cm 3 6cm 3 7cm 3 8cm 3 9cm 3 10cm 3 Either of the following. Optionally, the volume of the accommodating space is 0.5 cm³. 3 -3cm 3 .

[0052] As described above, while avoiding excessively large apertures in the first through hole 11 and ensuring the supporting strength of the first wall 1, the capacity of the warning object contained in the accommodating space is ensured to be large enough so that the leaked warning object can be detected and identified when the triggering condition is met.

[0053] In some embodiments of this application, the warning substance is at least one of a colored gas, a gas that changes color upon contact with air, and a gas with an odor.

[0054] It should be noted that colored gases are gases that are inherently colored. Gases that change color upon contact with air are those that are the first color or transparent when not in contact with air, but change from the first color or transparent to the second color upon contact with air. Odorless gases are gases that have an odor.

[0055] Furthermore, the warning substance can be a colored gas that is also an odorous gas. In this case, Br2 can be used as the warning substance. It is reddish-brown in color and has a salty, fishy, ​​pungent and irritating odor. As mentioned above, the leakage of the warning substance can be identified by color and odor.

[0056] When the warning substance is a colored gas, O3 (ozone is a blue gas) can be used; when the warning substance is a gas that changes color upon contact with air, NO can be used (when NO comes into contact with O2 in the air, the two react rapidly to form NO2, which is a reddish-brown gas). In this case, the colored gas or the gas that changes color upon contact with air is injected into the containment space at a certain concentration. When the explosion-proof valve 2 bursts, the gas inside the battery will overflow into the containment space. The rapidly expanding gas pressure will instantly force open the cover 3, allowing the colored gas or the gas that changes color upon contact with air to escape. Based on the color change around the cover 3, the opening time of the explosion-proof valve 2 can be quickly determined.

[0057] When the warning substance is an odorous gas, any one of F2, Cl2, or Br2 can be selected. In this case, the opening time of the explosion-proof valve 2 can be quickly determined based on the change in odor.

[0058] Furthermore, the gaseous molar concentration of the warning substance is 0.1 mol / L to 1.0 mol / L; for example, any one of the following gaseous molar concentrations: 0.1 mol / L, 0.2 mol / L, 0.3 mol / L, 0.4 mol / L, 0.5 mol / L, 0.6 mol / L, 0.7 mol / L, 0.8 mol / L, 0.9 mol / L, and 1.0 mol / L.

[0059] When conducting safety tests on individual battery cells, in order to eliminate errors in chemical experiments, battery cells from the same batch should be selected, and after capacity testing, battery cells with similar capacity, internal resistance, and voltage should be chosen.

[0060] In summary, the housing of this application has the following advantages: ① It only requires placing the warning material into the accommodating space, making it simple to manufacture, easy to operate, and inexpensive; ② It has a fast response speed. Due to the high gas pressure when the explosion-proof valve 2 bursts, it will instantly open the cover plate 3. The opening time of the cover plate 3 is almost the same as the bursting time of the explosion-proof valve 2. Combined with the color change and / or odor change of the gas around the cover plate 3 when the warning material leaks, the opening time of the explosion-proof valve 2 can be quickly and effectively identified; ③ It has a wide range of applications and can be applied to any safety test; ④ It has flexible application methods. Different warning materials can be injected into the accommodating space of different battery cells, so the opening time of the explosion-proof valve 2 of each battery cell can be intuitively distinguished.

[0061] Example 1

[0062] Please see the appendix Figure 2The selected battery cells are used, and each battery cell has an injection hole 31 on its cover plate 3. A colored gas marked with a color is drawn in using a syringe; the colored gas is ozone (blue). The syringe needle is used to quickly inject the colored gas into the accommodating space through the injection hole 31 of the cover plate 3, and then the injection hole is quickly sealed using the sealing member 4. After standing for 60 minutes, the colored gas is fully and evenly dispersed in the accommodating space.

[0063] Example 2

[0064] Please see the appendix Figure 3 The battery cells selected above are used. The cover plate 3 of the battery cells does not have an injection hole 31. The encapsulation container 5 is selected as the container for the colored gas. The material of the encapsulation container 5 is a modified starch material, which has the property of decomposing when the temperature exceeds 50°C. The colored gas is injected into the encapsulation container 5 using the needle of a syringe. The cover plate 3 is torn off and the encapsulation container 5 is inserted into the accommodating space. The torn part of the cover plate 3 is quickly sealed with tape.

[0065] After intense charging and discharging, the temperature of a single battery cell can easily exceed 50°C. At this point, the encapsulation container 5 will decompose, and the colored gas inside the encapsulation container 5 will rapidly fill the entire containment space. Of course, the encapsulation container 5 can also be placed in the containment space during the manufacturing process of the battery cell; this embodiment does not limit this approach.

[0066] The steps for safety testing of individual battery cells are as follows:

[0067] Step 1: Conduct normal safety tests on the battery cells, such as overcharging, over-discharging, or heating; place the battery cells in the test chamber, connect the current wire between the positive and negative busbars, and connect the voltage measurement circuit at the same time.

[0068] Step 2: Run the process steps to charge or discharge the experimental battery cells, and turn on the recording device at the same time;

[0069] Step 3: Observe the color change around the cover plate 3 to determine the opening time of the explosion-proof valve 2.

[0070] Based on the aforementioned casing, this application embodiment also provides a battery cell, which includes the casing and the cell described above, with the cell located inside the casing.

[0071] Since the battery cell in this application embodiment includes the casing as described above, the beneficial effects of the battery cell brought by the casing can be found above and will not be repeated here.

[0072] In some embodiments of this application, the battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery cell, sodium-ion battery cell, sodium-lithium-ion battery cell, lithium metal battery cell, sodium metal battery cell, lithium-sulfur battery cell, magnesium-ion battery cell, nickel-metal hydride battery cell, nickel-cadmium battery cell, lead-acid battery cell, etc., and this application does not limit this. As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, other battery cells with a rigid casing and an explosion-proof valve, or other shaped battery cells. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells, etc., and this application does not have any particular limitations.

[0073] Based on the aforementioned battery cells, this application embodiment also provides a battery comprising at least two battery cells as described above, wherein different warning objects are disposed within the accommodating space of different battery cells.

[0074] As shown above, the opening time of the explosion-proof valve of each battery cell can be intuitively identified. Since the battery in this embodiment includes the battery cells described above, the beneficial effects brought by the battery cells are described above and will not be repeated here.

[0075] The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more batteries to provide higher voltage and capacity.

[0076] In some embodiments, the battery can be a battery module, and when there are multiple batteries, the multiple batteries are arranged and fixed to form a battery module.

[0077] In some embodiments, the battery may be a battery pack, which includes a housing and a battery, with the battery or battery module housed within the housing.

[0078] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0079] Based on the aforementioned battery cell or battery, this application embodiment also provides an electrical device, which includes the battery cell or battery as described above.

[0080] Since the electrical equipment in this application embodiment includes the battery cell or battery described above, the beneficial effects of the electrical equipment brought by the battery cell or battery are described above and will not be repeated here.

[0081] Multiple individual batteries or multiple batteries can directly power electrical devices, or they can be connected in parallel, series, or a hybrid configuration to form a power supply device, such as a battery module, to power various electrical devices. Electrical devices can include automobiles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Automobiles can be gasoline-powered, natural gas-powered, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This article does not impose any special restrictions on the above-mentioned electrical devices.

[0082] The components and devices described in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the accompanying drawings. As those skilled in the art will recognize, these components and devices can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the words “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0083] It should also be noted that in the apparatus of this application, the components can be disassembled and / or reassembled. These disassemblies and / or reassemblies should be considered as equivalent solutions of this application.

[0084] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be applied within the widest scope consistent with the principles and novel features disclosed herein.

[0085] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0086] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A housing, characterized in that, Includes a first wall (1), and along the thickness direction of the first wall (1), the first wall (1) has a through hole (11); an explosion-proof valve (2) is sealed at the first opening of the through hole (11), and a cover plate (3) is sealed at the second opening of the through hole (11); the through hole (11), the explosion-proof valve (2), and the cover plate (3) form a sealed accommodating space, and a warning object is provided in the accommodating space; When the triggering condition is reached, the explosion-proof valve (2) and the cover plate (3) both rupture, so that the warning object leaks from the accommodating space to the outside of the housing.

2. The housing according to claim 1, characterized in that, The second opening is formed on the outer surface of the first wall (1); The cover (3) has an injection hole (31) for injecting the warning substance through the injection hole (31); A sealing element (4) is provided at the injection hole (31) to block the injection hole (31).

3. The housing according to claim 2, characterized in that, The sealing element (4) is an adhesive element, which is bonded to the cover plate (3).

4. The housing according to claim 2 or 3, characterized in that, An adhesive layer is provided between the cover plate (3) and the seal (4) along the circumferential direction of the seal (4).

5. The housing according to claim 1, characterized in that, The warning object is placed inside the packaging container (5), and the packaging container (5) is disposed within the accommodating space; When the target temperature is exceeded, the encapsulation container (5) decomposes and releases the warning substance, wherein the target temperature is less than or equal to the temperature at which the trigger condition is reached.

6. The housing according to claim 1, characterized in that, The volume of the accommodating space is 0.3 cm³. 3 -10cm 3 .

7. The housing according to claim 1, characterized in that, The warning substance is at least one of the following: colored gas, gas that changes color upon contact with air, and odorous gas.

8. A single battery cell, characterized in that, Includes a housing as described in any one of claims 1-7, and a battery cell located inside the housing.

9. A battery, characterized in that, It includes at least two battery cells as described in claim 8, wherein different warning objects are provided in the accommodating space of different battery cells.

10. An electrical appliance, characterized in that, It includes the battery cell as described in claim 8, or the battery as described in claim 9.

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