Battery cover plate, battery cell, battery and electric device

Abstract

A battery cover plate (122), a battery cell (12), a battery (1), and an electric device (2). The battery cover plate (122) may comprise a top cover plate (1221) and a detection assembly (1222). The top cover plate (1221) has a first plate surface (12212) and a second plate surface (12213) which face away from each other, and a first through hole (12211) passing through the first plate surface (12212) and the second plate surface (12213). The first through hole (12211) is staggered from a pole (125), a liquid injection hole (127) and a pressure relief valve (126). The detection assembly (1222) is embedded in the first through hole (12211) and blocks the first through hole (12211).

Description

Battery cover, battery cell, battery and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2024201246050, filed on January 18, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cover, a battery cell, a battery, and an electrical device. Background Art

[0004] A battery cell may include an electrode assembly, an end cap, and a housing; the end cap is attached to the housing to form a mounting cavity for mounting the electrode assembly. However, existing battery cells have a leakage problem.

[0005] Summary of the Invention

[0006] The main technical problem solved by the present application is to provide a battery cover, a battery cell, a battery and an electrical device to solve the problem that the sensor is installed in the injection hole and it is difficult to seal the injection hole.

[0007] To address the aforementioned technical issues, the first technical solution employed in this application is to provide a battery cover, which may include a top cover and a detection assembly. The top cover has a first plate surface and a second plate surface facing each other, and a first through-hole extending through the first and second plates; the first through-hole is staggered relative to the terminal, the liquid injection port, and the pressure relief valve. The detection assembly is embedded in the first through-hole and blocks the first through-hole.

[0008] In this way, the first through-hole can be designed on the top cover plate according to the detection assembly, so that the detection assembly fits well with the first through-hole, allowing the detection assembly to be sealed within the first through-hole. In addition, the first through-hole is staggered with the terminal, the liquid injection hole, and the pressure relief valve, thereby reducing the mutual influence between the detection assembly, the terminal, the liquid injection hole, and the pressure relief valve.

[0009] In some embodiments, the detection assembly includes a mounting shell, a sensor and a limiter, and the mounting shell includes a connected main body and a limiter; the main body passes through the first through hole, and the limiter is blocked by the second plate surface on one side of the second plate surface; the sensor is connected to the mounting shell; the limiter is connected to the portion of the main body protruding from the first plate surface, and is blocked by the first plate surface on one side of the first plate surface. In this way, the main body can pass through the first through hole, and the limiter is blocked by the second plate surface, so that the limiter is located on one side of the second plate surface. The limiter is connected to the main body, and the limiter is located on one side of the first plate surface. The mounting shell is thereby fixedly installed in the first through hole. Since the sensor is connected to the mounting shell, the sensor can detect the environment inside the shell (such as temperature, air pressure, etc.).

[0010] In some embodiments, the detection assembly further includes a diaphragm and silicone oil; the stopper has a second through-hole; the diaphragm is connected to the stopper and seals the second through-hole; and the sensor and silicone oil are both located within the mounting housing. The internal environment of the housing (e.g., temperature, air pressure) causes deformation of the diaphragm, which, through conduction of the silicone oil, induces a response from the sensor, allowing the sensor to detect the environment within the housing. The sensor's detection signal can be transmitted to an external battery management system.

[0011] In some embodiments, the main body has a slot, and the limiting member is engaged in the slot. In this way, the main body is connected to the limiting member by engaging.

[0012] In some embodiments, the retaining groove is an annular groove, and the retaining member includes a dominant arc portion and two retaining blocks, with the two retaining blocks respectively connected to the ends of the dominant arc portion; at least a portion of the dominant arc portion is retained within the annular groove, while the retaining blocks are positioned outside the annular groove. In this manner, the retaining blocks and the dominant arc portion form a unit that allows the retaining member to engage with the main body, providing a tight connection and facilitating installation. The retaining member can also be blocked by the first plate surface on one side of the first plate surface.

[0013] In some embodiments, the detection assembly further includes a sealing ring that seals between the second plate surface and the limiting portion. Thus, the sealing ring is first fitted onto the main body, and then the main body is passed through the first through hole, so that the sealing ring is positioned between the second plate surface and the limiting portion, thereby sealing the second plate surface and the limiting portion.

[0014] In some embodiments, the detection assembly further includes a washer that is sleeved on the main body and located between the first plate surface and the stopper. In this way, the washer can reduce the gap between the stopper and the first plate surface, thereby reducing the shaking of the main body in the first through hole.

[0015] In some embodiments, the detection assembly further includes a connecting wire; the main body has a third through hole, one end of the connecting wire is connected to the sensor, and the other end is located on a side of the first board through the third through hole. In this way, the sensor detection signal is transmitted to an external battery management system via the connecting wire.

[0016] In some embodiments, the top cover plate is sequentially provided with a first pole, a liquid injection hole, a pressure relief valve, and a second pole; the first through hole is located between the second pole and the pressure relief valve. Due to the large distance between the second pole and the pressure relief valve, the design of the first through hole is relatively flexible.

[0017] To address the aforementioned technical issues, the second technical solution provided by this application is as follows: a battery cell comprising a housing, an electrode assembly, and a battery cover, each having a connected cavity and a mounting opening; the electrode assembly being disposed within the cavity; and the battery cover being connected to the housing, with the second panel covering the mounting opening. The battery cell includes the aforementioned battery cover, and thus, the battery cell has the same effects as the battery cover, and further description thereof will be omitted.

[0018] To address the aforementioned technical issues, the present application provides a third technical solution: a battery comprising a battery housing and a battery cell; the battery cell is mounted within the battery housing. The battery includes the aforementioned battery cell, and thus, the battery has the same effects as the battery cell, which will not be further described.

[0019] To solve the above technical problems, the fourth technical solution provided by this application is to provide an electrical device, the electrical device including an electrical device and a battery, wherein the battery is connected to the electrical device. The electrical device includes the above-mentioned battery, and therefore, the electrical device has the same effect as the battery, which will not be described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] FIG1 is a schematic structural diagram of an electrical device provided in this application;

[0022] FIG2 is a schematic structural diagram of a battery provided in this application;

[0023] FIG3 is a schematic structural diagram of a battery cell provided in this application;

[0024] FIG4 is a schematic structural diagram of a battery cover provided by the present application;

[0025] FIG5 is an exploded view of a battery cover provided by the present application;

[0026] FIG6 is a schematic diagram of the structure of the detection component provided by the present application;

[0027] FIG7 is a schematic structural diagram of a position limiting member provided in the present application;

[0028] FIG8 is a schematic structural diagram of another battery cover provided by the present application;

[0029] FIG9 is a schematic structural diagram of another battery cover provided in the present application.

[0030] In the figure: 1, battery; 11, battery case; 111, upper case; 112, lower case; 12, battery cell; 121, connecting member; 122, battery cover; 1221, top cover; 12211, first through hole; 12212, first plate surface; 12213, second plate surface; 1222, detection component; 12221, mounting shell; 12222, sealing ring; 12223, gasket; 1222 4. Limiting member; 12225. Connecting wire; 12226. Diaphragm; 1281. Main body; 1282. Limiting portion; 1283. Slot; 1284. Block; 1285. Excellent arc portion; 1286. Second through hole; 1223. Plastic plate; 12231. Third through hole; 123. Electrode assembly; 124. Shell; 125. Pole; 126. Pressure relief valve; 127. Liquid injection hole; 2. Electrical device. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0032] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0033] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] The terms "first," "second," and "third" in this application are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of such features. In the description of this application, "multiple" means at least two, for example, two, three, etc., unless otherwise specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications also change accordingly. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0035] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In related art, a battery cell may include an electrode assembly, an end cap, and a housing; the end cap is attached to the housing to form a mounting cavity for the electrode assembly. A sensor is installed within the end cap's injection hole, allowing the sensor to detect the environment within the battery cell (e.g., temperature, air pressure, etc.). However, since the injection hole is a standard hole, conventional sensors installed within it are difficult to seal the injection hole, which can easily cause leakage in the battery cell.

[0037] To address the aforementioned sensor issues, an embodiment of the present application provides a battery cover plate, wherein a first through-hole is provided in the top cover plate, offset from the terminal, the liquid injection hole, and the pressure relief valve. The detection assembly is snapped into the first through-hole, thereby sealing the first through-hole. In this way, the first through-hole can be designed in the top cover plate according to the detection assembly, so that the detection assembly and the first through-hole are closely matched, thereby allowing the detection assembly to be sealed within the first through-hole.

[0038] The embodiments of the present application provide an electrical device. The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car 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 screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. For the sake of convenience, the following embodiments are described using a vehicle as an example of an electrical device.

[0039] 1 , the electric equipment may include an electric device 2 and a battery 1 , wherein the battery 1 is electrically connected to the electric device 2 so that the battery 1 provides electric energy to the electric device 2 .

[0040] The electrical device 2 may be a component or device capable of consuming electricity; for example, the electrical device 2 may be a controller. The controller may be a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. For another example, the electrical device 2 may be an electronic component.

[0041] In the case where the electrical equipment may be a vehicle as shown in FIG1 , the electrical device 2 may be a lamp (eg, headlight, taillight, etc.), a display screen, an instrument panel, a control system (eg, a controller), etc. in the vehicle.

[0042] In some examples, the electric device may further include other parts. For example, when the electric device is a vehicle, the other parts may be the vehicle body, for example, the battery 1 and the electric device 2 are both mounted on the vehicle body.

[0043] The battery 1 is used to provide electric energy to the electric device 2 so as to facilitate the operation of the electric device 2. Referring to FIG2 , the battery 1 may include a battery case 11 and a battery cell 12; the battery cell 12 is installed in the battery case 11.

[0044] The battery case 11 is used to provide a storage space for one or more battery cells 12, so that the battery case 11 can protect the battery cells 12; at the same time, it is also convenient to gather multiple battery cells 12 together. The battery case 11 may include a lower case 112 and an upper case 111, and the upper case 111 is snapped onto the lower case 112 to form a storage space that can accommodate the battery cells 12. The shape of the battery case 11 can be specifically set as needed. For example, the shape of the battery case 11 can be cylindrical, and the corresponding battery 1 can be called a circular battery 1; for another example, the shape of the battery case 11 can be rectangular, and the corresponding battery 1 can be called a rectangular battery 1.

[0045] The battery cells 12 may be secondary batteries, which are batteries that can be recharged to activate their active materials after discharge and continue to be used. The battery cells 12 may include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, and lead-acid batteries.

[0046] In the battery 1, the number of battery cells 12 can be one or more. Among them, multiple battery cells 12 can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 12 are connected in series and in parallel. Multiple battery cells 12 can be directly connected in series, in parallel, or in mixed connection, and then the whole composed of multiple battery cells 12 is accommodated in the box. Of course, it is also possible that multiple battery cells 12 are first connected in series, in parallel, or in mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and the whole is accommodated in the box. The multiple battery cells 12 in the battery module can be electrically connected through a busbar component to achieve, for example, parallel connection, series connection, or mixed connection of multiple battery cells 12 in the battery module.

[0047] Referring to Figure 3 , a battery cell 12 may include a housing 124, an electrode assembly 123, and a battery cover 122. Housing 124 has a cavity and a mounting opening that communicate with each other. Electrode assembly 123 is disposed within the cavity. Battery cover 122 is connected to housing 124, with the second panel covering the mounting opening.

[0048] The electrode assembly 123 is installed in the housing 124 through the mounting opening. After the battery cover 122 (also called an end cap) is connected to the housing 124, the battery cover 122 covers the mounting opening to form a chamber for accommodating the electrode assembly 123. There can be one or more electrode assemblies 123. The housing 124 is filled with an electrolyte, such as an electrolyte solution. The battery cover 122 is generally flat.

[0049] The electrode assembly 123 may include a positive electrode sheet and a negative electrode sheet, as well as a separator (e.g., a diaphragm) disposed between the positive and negative electrode sheets. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) are embedded in and released from the positive and negative electrode sheets. The separator can prevent the positive and negative electrode sheets from short-circuiting to a certain extent while allowing active ions to pass through.

[0050] The shell 124 is a hollow structure, and a storage space for accommodating the electrode assembly 123 and the electrolyte is formed therein. The shape of the shell 124 can be determined according to the specific shape of the electrode assembly 123. For example, if the electrode assembly 123 is a rectangular parallelepiped structure, a rectangular parallelepiped shell can be selected. The material of the shell 124 can be various, for example, the material of the shell 124 can be metal or plastic. Alternatively, the material of the shell 124 can be copper, iron, aluminum, steel, aluminum alloy, etc. Exemplarily, the shell 124 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film, etc.

[0051] The battery cell 12 may also include a pressure relief valve 126, two electrodes 125, and two connecting members 121 (also referred to as current collecting members). The two electrodes 125 may be disposed on the battery cover 122, for example, the two electrodes 125 may be fixed to the battery cover 122. The two electrodes 125 are respectively a positive electrode 125 and a negative electrode 125. Each electrode 125 corresponds to a connecting member 121. The connecting member 121 is located between the battery cover 122 and the electrode assembly 123 and is used to electrically connect the electrode assembly 123 and the electrodes 125. The pressure relief valve 126 may be disposed on the battery cover 122, for example, the pressure relief valve 126 may be fixed to the battery cover 122. The pressure relief valve 126 is configured to actuate to release the internal pressure or temperature of the battery cell 12 when the internal pressure or temperature reaches a threshold value. For example, the pressure relief valve 126 may be a temperature-sensitive pressure relief valve, or a pressure-sensitive pressure relief valve.

[0052] Referring to Figures 4 and 5 , the battery cover 122 can include a top cover 1221 and a detection assembly 1222. The top cover 1221 has a first plate surface 12212 and a second plate surface 12213 that face each other, and a first through-hole 12211 that extends through the first and second plates 12212 and 12213. The first through-hole 12211 is staggered from the terminal 125, the liquid injection hole 127, and the pressure relief valve 126. The detection assembly 1222 is embedded in the first through-hole 12211 and blocks it.

[0053] In this way, first through-hole 12211 can be designed in top cover plate 1221 based on detection assembly 1222, ensuring a close fit between detection assembly 1222 and first through-hole 12211, allowing detection assembly 1222 to be sealed within first through-hole 12211. Furthermore, first through-hole 12211 is staggered from terminal 125, injection hole 127, and pressure relief valve 126, minimizing any interference between detection assembly 1222, terminal 125, injection hole 127, and pressure relief valve 126. Furthermore, this avoids safety issues associated with installing the sensor on the pressure relief valve.

[0054] Furthermore, embedding the detection assembly 1222 in the top cover plate 1221 not only facilitates installation but also maintains the manufacturing process of the battery cell 12. Furthermore, the thickness of the top cover plate 1221 remains unchanged, meaning that the overall dimensions of the top cover plate 1221 remain essentially unchanged. Thus, the battery cell 12 fabricated using this top cover plate 1221 can monitor the environment (e.g., air pressure, temperature, etc.) within the battery cell 12 without changing the structure of the battery cell 12.

[0055] First through hole 12211 penetrates first plate surface 12212 and second plate surface 12213; it can be understood that first through hole 12211 is a hole that penetrates top cover plate 1221, i.e., a through hole. Detection assembly 1222 is embedded in first through hole 12211 and blocks first through hole 12211; it can be understood that detection assembly 1222 is sealed and installed in first through hole 12211.

[0056] The first through hole 12211 is staggered with the terminal 125, the injection hole 127, and the pressure relief valve 126; it can be understood that the first through hole 12211 does not intersect with the terminal 125, the injection hole 127, and the pressure relief valve 126. The injection hole 127 is used to inject electrolyte into the housing 124. After the electrolyte is injected, the injection hole 127 is sealed.

[0057] In some embodiments, referring to Figures 5 and 6 , detection assembly 1222 includes a mounting housing 12221, a sensor, and a stopper 12224. Mounting housing 12221 includes a main body 1281 and a stopper 1282 connected to each other. Main body 1281 passes through first through-hole 12211, and stopper 1282 is blocked on one side of second plate 12213 by second plate 12213. The sensor is connected to mounting housing 12221. Stopper 12224 is connected to the portion of main body 1281 that protrudes from first plate 12212 and is blocked on one side of first plate 12212 by first plate 12212.

[0058] In this way, the main body 1281 can pass through the first through-hole 12211, and the stopper 1282 is blocked by the second plate 12213, so that the stopper 1282 is located on one side of the second plate 12213. A stopper 12224 is connected to the main body 1281 and is located on one side of the first plate 12212. This secures the mounting housing 12221 within the first through-hole 12211. Since the sensor is connected to the mounting housing 12221, it can detect the environment (e.g., temperature, air pressure, etc.) within the housing 124.

[0059] The mounting shell 12221 can be made of a metal material, which can be a single substance such as silver, aluminum, copper, iron, etc. The metal material can also be an alloy of the above single substances. The mounting shell 12221 can also be made of a non-metallic material such as plastic or acrylic.

[0060] The material of the stopper 12224 can be a metal material, which can be a single substance such as silver, aluminum, copper, iron, etc. The metal material can also be an alloy of the above single substances. The material of the stopper 12224 can also be a non-metallic material such as plastic, acrylic, etc.

[0061] The sensor may be at least one of a temperature sensor, a pressure sensor, and a gas sensor. Of course, the sensor may also be other detection sensors, which will not be described in detail.

[0062] The stopper 12224 is connected to the portion of the main body 1281 that protrudes from the first plate surface 12212 and is blocked on one side of the first plate surface 12212 by the first plate surface 12212. It can be understood that a portion of the stopper 12224 is connected to the main body 1281, while another portion of the stopper 12224 is located outside the main body 1281 and is blocked on one side of the first plate surface 12212 by the first plate surface 12212. For example, another portion of the stopper 12224 contacts the first plate surface 12212, such that another portion of the stopper 12224 is blocked on one side of the first plate surface 12212 by the first plate surface 12212. The stopper 12224 and the main body 1281 can be fixedly connected; for example, after the main body 1281 passes through the first through hole 12211, the stopper 12224 can be welded to the main body 1281. The limiting member 12224 and the main body 1281 may also be detachably connected; for example, the limiting member 12224 is snapped onto the main body 1281 ; for another example, the limiting member 12224 is threadedly connected to the main body 1281 .

[0063] The main body 1281 and the limiting portion 1282 are fixedly connected; for example, the main body 1281 and the limiting portion 1282 are an integral structure; for example, the main body 1281 and the limiting portion 1282 are welded. The shape of the main body 1281 is adapted to the shape of the first through hole 12211, so that the gap between the main body 1281 and the first through hole 12211 is small, which facilitates sealing between the main body 1281 and the first through hole 12211; of course, sealing can also be performed between the limiting portion 1282 and the second plate surface 12213. For example, the shape of the main body 1281 is cylindrical, and the shape of the first through hole 12211 is circular; for another example, the shape of the main body 1281 is a cuboid, and the shape of the first through hole 12211 is rectangular. The shape of the limiting portion 1282 can be any shape such as a cuboid or a cylinder.

[0064] The sensor is connected to the mounting shell 12221. In some examples, the sensor is mounted on the outside of the limiting portion 1282. In other examples, the sensor is mounted inside the mounting shell 12221; for example, the sensor is mounted inside the main body 1281.

[0065] Since the size of the main body 1281 is smaller than the size of the first through hole 12211, and the size of the limiting portion 1282 is larger than the size of the first through hole 12211, the main body 1281 can pass through the first through hole 12211, but the limiting portion 1282 cannot pass through the first through hole 12211, and the second plate surface 12213 is blocked on one side of the second plate surface 12213.

[0066] In some embodiments, referring to Figures 5 and 6 , the detection assembly 1222 further includes a diaphragm 12226 and silicone oil. The stopper 1282 has a second through hole 1286. The diaphragm 12226 is connected to the stopper 1282 and seals the second through hole 1286. The sensor and silicone oil are both located within the mounting housing 12221. The silicone oil is located between the sensor and the diaphragm 12226.

[0067] The internal environment of the housing 124 (e.g., temperature, air pressure) causes the deformation of the diaphragm 12226, which, through the conduction of silicone oil, causes the sensor to respond, allowing the sensor to detect the environment inside the housing 124. The sensor's detection signal can be transmitted to an external battery management system.

[0068] Diaphragm 12226 can be made of a metal material. The metal material can be a single element, such as silver, aluminum, copper, or iron. The metal material can also be an alloy of the above elements. For example, diaphragm 12226 can be made of stainless steel. In this case, diaphragm 12226 can also be referred to as stainless steel diaphragm 12226. Both diaphragm 12226 and mounting housing 12221 made of stainless steel are resistant to corrosion from electrolytes and are well-suited for use with battery cells 12.

[0069] The diaphragm 12226 and the limiting portion 1282 may be fixedly connected, for example, the diaphragm 12226 and the limiting portion 1282 may be connected by laser welding to ensure sealing.

[0070] In some embodiments, the main body 1281 has a slot 1283, and the limiting member 12224 is locked in the slot 1283. In this way, the main body 1281 is connected to the limiting member 12224 by the locking method.

[0071] In some embodiments, referring to Figures 5 to 7, the slot 1283 is an annular slot, and the limiting member 12224 includes a superior arc portion 1285 and two clamping blocks 1284, and the two clamping blocks 1284 are respectively connected to the two ends of the superior arc portion 1285. At least a portion of the superior arc portion 1285 is clamped in the annular slot, and the clamping blocks 1284 are located outside the annular slot. In this way, the integral body formed by the clamping blocks 1284 and the superior arc portion 1285 can enable the limiting member 12224 to be clamped with the main body 1281, so that the limiting member 12224 is tightly connected to the main body 1281 and is easy to install. The limiting member 1282 can also be blocked by the first plate surface 12212 on one side of the first plate surface 12212.

[0072] In some examples, the blocking block 1284 contacts the first plate surface 12212 , such that the blocking block 1284 is blocked by the first plate surface 12212 on one side of the first plate surface 12212 .

[0073] The major arc portion 1285 may be a circular arc segment that is larger than one-half, for example, it may be a circular arc segment that is three-quarters, or it may be a circular arc segment that is four-fifths.

[0074] The two clamping blocks 1284 are respectively connected to the two ends of the major arc portion 1285. The clamping blocks 1284 and the major arc portion 1285 can be fixedly connected, such as by welding, or as an integral structure. The clamping blocks 1284 and the major arc portion 1285 can also be detachably connected, such as by threading.

[0075] In some embodiments, the detection assembly 1222 further includes a sealing ring 12222, which seals between the second plate surface 12213 and the stopper. Thus, the sealing ring 12222 is first fitted onto the main body 1281, and then the main body 1281 is passed through the first through hole 12211, so that the sealing ring 12222 is located between the second plate surface 12213 and the stopper, thereby sealing the gap between the second plate surface 12213 and the stopper.

[0076] The sealing ring 12222 can be made of rubber, silicone, or other materials. For example, the sealing ring 12222 can be made of fluororubber, which can be called a fluororubber ring. The fluororubber ring has good corrosion resistance to electrolytes and is therefore suitable for the complex environment inside the battery cell 12.

[0077] In other embodiments, the sealing ring 12222 may be disposed between the main body 1281 and the first through hole 12211 to seal the gap between the main body 1281 and the first through hole 12211 .

[0078] In some embodiments, the detection assembly 1222 further includes a washer 12223, which is sleeved on the main body 1281 and located between the first plate surface 12212 and the stopper 12224. In this way, the washer 12223 can reduce the gap between the stopper 12224 and the first plate surface 12212, thereby reducing the shaking of the main body 1281 within the first through hole 12211.

[0079] In some examples, the washer 12223 can be fixed on the first plate surface 12212. In other examples, the washer 12223 can be mounted on the main body 1281.

[0080] In some embodiments, the detection assembly 1222 further includes a connecting wire 12225. The main body 1281 has a third through hole. One end of the connecting wire 12225 is connected to the sensor, and the other end is located on a side of the first plate 12212 through the third through hole. In this way, the sensor detection signal is transmitted to an external battery management system via the connecting wire 12225.

[0081] In other embodiments, the sensor is located in the main body 1281, and the third through hole of the main body 1281 can expose the sensor. In this way, the sensor can transmit the sensor's detection signal to an external battery management system in a wireless manner.

[0082] In some embodiments, the top cover plate 1221 is sequentially provided with a first pole 125, a liquid injection hole 127, a pressure relief valve 126, and a second pole 125. The first through-hole 12211 is located between the second pole 125 and the pressure relief valve 126. For example, the centers of the first pole 125, the liquid injection hole 127, the pressure relief valve 126, the first through-hole 12211, and the second pole 125 are all located on an axis parallel to the long side of the rectangular top cover plate 1221. The greater distance between the second pole 125 and the pressure relief valve 126 allows for greater flexibility in the design of the first through-hole.

[0083] In some embodiments, referring to FIG8 , the battery cover 122 may further include a plastic plate 1223 ; the plastic plate 1223 is stacked with the top cover 1221 , i.e., the plastic plate 1223 is disposed on the second surface of the top cover 1221 . The plastic plate 1223 has a third through hole 12231 . The third through hole 12231 is coaxial with the first through hole 12211 and has the same aperture; the third through hole 12231 is connected to the first through hole 12211 to form a passage. The main body 1281 passes through the third through hole 12231 and the first through hole 12211 in sequence, and the stopper 1282 is located on the side of the plastic plate 1223 away from the top cover 1221 .

[0084] In other embodiments, as shown in FIG9 , the battery cover 122 may further include a plastic plate 1223; the plastic plate 1223 is stacked with the top cover 1221. The plastic plate 1223 has a third through hole 12231. The third through hole 12231 is coaxial with the first through hole 12211, and the diameter of the third through hole 12231 is larger than that of the first through hole 12211. The third through hole 12231 is connected to the first through hole 12211. The main body 1281 passes through the first through hole 12211, and at least a portion of the limiting portion 1282 is located within the third through hole 12231. For example, a portion of the limiting portion 1282 is located within the third through hole 12231, while another portion of the limiting portion 1282 is located outside the third through hole 12231. In another example, all of the limiting portion 1282 is located within the third through hole 12231.

[0085] The top cover sheet can be made of a metal material, which can be a single metal, such as aluminum, iron, copper, etc. The metal material can also be a single non-metallic material, such as an alloy of the above-mentioned single metals. The top cover sheet can also be made of a non-metallic material, such as rubber, organic glass (e.g., an acrylic sheet), etc.

[0086] The above description is only an implementation method of the present application and does not limit the scope of patent protection of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present application.

Claims

1. A battery cover plate, wherein, Comprising: A top cover plate, having a first plate surface and a second plate surface facing away from each other, and a first through hole penetrating through the first plate surface and the second plate surface; The first through hole is offset from the pole post, the liquid injection hole, and the pressure relief valve; A detection assembly, embedded in the first through hole and sealing the first through hole.

2. The battery cover plate according to claim 1, wherein, The detection assembly includes: An installation shell, including a connected main body portion and a limiting portion; the main body portion passes through the first through hole, and the limiting portion is blocked on one side of the second plate surface by the second plate surface; A sensor, connected to the installation shell; and, A limiting member, connected to a portion of the main body portion protruding from the first plate surface and blocked on one side of the first plate surface by the first plate surface.

3. The battery cover plate according to claim 2, wherein The detection assembly further includes a diaphragm and silicone oil; the limiting portion has a second through hole; the diaphragm is connected to the limiting portion and seals the second through hole; the sensor and the silicone oil are both located inside the installation shell, and the silicone oil is located between the sensor and the diaphragm.

4. The battery cover plate according to claim 2 or 3, wherein, The main body portion has a card slot, and the limiting member is snap-fitted in the card slot.

5. The battery cover plate according to claim 4, wherein, The card slot is an annular slot, the limiting member includes a major arc portion and two card blocks, and the two card blocks are respectively connected to both ends of the major arc portion; at least a part of the major arc portion is snap-fitted in the annular slot, and the card blocks are located outside the annular slot.

6. The battery cover plate according to any one of claims 2 to 5, wherein, The detection assembly further includes: A sealing ring, sealed between the second plate surface and the limiting portion.

7. The battery cover plate according to any one of claims 2 to 6, wherein, The detection assembly further includes: A washer, sleeved on the main body portion and located between the first plate surface and the limiting member.

8. The battery cover plate according to any one of claims 2 to 7, wherein, The detection assembly further includes a connecting wire; the main body portion has a third through hole, one end of the connecting wire is connected to the sensor, and the other end is located on one side of the first plate surface through the third through hole.

9. The battery cover plate according to any one of claims 1 to 8, wherein, The first pole post, the liquid injection hole, the pressure relief valve, and the second pole post are sequentially distributed on the top cover plate; the first through hole is located between the second pole post and the pressure relief valve.

10. A battery cell, wherein, Comprising: A housing, having a communicating cavity and an installation opening; An electrode assembly, arranged in the cavity; The battery cover plate according to any one of claims 1 to 9, the battery cover plate is connected to the housing, and the second plate surface covers the installation opening.

11. A battery, wherein, Comprising: A battery box body and the battery cell according to claim 10; The battery cell is installed in the battery box body.

12. An electrical device, wherein, Comprising: An electric device and the battery according to claim 11, the battery is connected to the electric device.

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