Air exhausting and liquid supplementing structure

Abstract

The utility model provides an exhausting and liquid supplementing structure, which is arranged on a cover plate of a battery cell, and comprises a hollow structure arranged on the cover plate; the guide block is arranged in the hollow structure in a penetrating manner; the first channel and the second channel are arranged at the two ends of the guide block; first ends of the two terminals are respectively communicated with the interior and the exterior of the battery cell; in the reciprocating sliding process of the guide block relative to the cover plate, the second end of the first channel and the second end of the second channel alternately communicate with the hollow structure; according to the application, gas generated in the cyclic charging and discharging process of the battery can be released by utilizing the exhausting and liquid supplementing structure, the pressure in the battery core in the battery is relieved, the expansion and deformation degree of the battery is reduced, the product quality of the battery is guaranteed, and the safety of the battery is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to an exhaust and liquid replenishment structure. Background Art

[0002] Batteries are core components in energy storage technologies and are widely used in high-tech fields such as portable electronic devices, electric vehicles, and large-scale energy storage systems. During the charge and discharge cycles of a battery, a series of physical and chemical changes occur inside the battery cells to achieve the storage and release of electrical energy. Among them, the positive and negative electrode materials inside the cells will experience partial structural collapse, structural component aging, and electrolyte decomposition during charge and discharge, resulting in the generation of excess gas inside the cells. When there is too much gas inside the cells, it will not only cause the battery to expand and deform, but also affect the battery performance and quality, posing a significant safety hazard to the use of the battery. Utility Model Content

[0003] In view of this, the purpose of this application is to propose an exhaust and liquid replenishment structure to solve some or all of the above-mentioned technical problems.

[0004] Based on the above purpose, this application provides an exhaust and liquid replenishment structure, which is arranged on the cover plate of the battery cell. The exhaust and liquid replenishment structure includes:

[0005] A hollow structure;

[0006] A guiding block, which is penetrated through the hollow structure;

[0007] A first channel and a second channel. The first channel and the second channel are arranged at both ends of the guiding block; the first ends of both are respectively communicated with the inside and the outside of the battery cell. During the reciprocating sliding of the guiding block relative to the cover plate, the second ends of the first channel and the second channel are alternately communicated with the hollow structure.

[0008] As can be seen from the above, for the exhaust and liquid replenishment structure provided by this application, the structure can release the gas generated inside the battery cell during the cyclic charge and discharge of the battery, so as to relieve the pressure inside the battery cell and reduce the degree of battery expansion and deformation. At the same time, the exhaust and liquid replenishment structure can also replenish the electrolyte into the battery cell, with simple operation and low difficulty, without the need to disassemble the battery housing and the battery cell, ensuring the product quality of the battery, extending the service life of the battery, and improving the safety of the battery. Description of the Drawings

[0009] To more clearly illustrate the technical solutions in the present application or related technologies, the following will briefly introduce the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings in the following descriptions are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0010] Figure 1 It is a schematic structural diagram of an exhaust and liquid supplement structure in the present application;

[0011] Figure 2 It is a schematic diagram of the state of the exhaust and liquid supplement structure in the first working condition in the present application;

[0012] Figure 3 It is a schematic diagram of the state of the exhaust and liquid supplement structure in the second working condition in the present application;

[0013] Figure 4 It is a schematic structural diagram of another exhaust structure in the present application;

[0014] Figure 5 It is a schematic structural diagram of a hollow structure in the present application;

[0015] Figure 6 It is a schematic structural diagram of another hollow structure in the present application.

[0016] Explanation of reference numerals:

[0017] 100, cover plate;

[0018] 210, hollow structure; 2111, first recess; 2112, plugging part; 2121, connecting part; 2122, second recess; 220, guiding block; 230, first channel; 240, second channel; 250, limiting part; 251, limiting protrusion; 252, limiting groove; 260, mating part; 270, first sealing ring; 280, second sealing ring;

[0019] 300, fitting groove;

[0020] 400, guiding surface;

[0021] 500, holding part. Detailed implementation manners

[0022] To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the following will further elaborate on the present application in detail in combination with specific embodiments and with reference to the accompanying drawings.

[0023] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of this application should have the ordinary meanings understood by those with ordinary skills in the field to which this application belongs. The "first", "second" and similar terms used in the embodiments of this application do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connect" or "be connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0024] The following will Figures 1-6 describe the embodiments of this application in detail with reference to the

[0025] Batteries are an important part of energy storage technology, and battery cells are one of the core components of batteries; as the usage time increases and the number of charge-discharge cycles increases, a series of chemical and physical changes inside the battery cells not only affect their performance stability and safety, but also affect the overall quality and application performance of the batteries.

[0026] Batteries mainly rely on various physical and chemical changes occurring inside them to achieve charging and discharging. Therefore, long-term application of batteries will cause degradation of the internal structure of the batteries. Specifically, taking lithium batteries as an example, the cyclic charging and discharging of batteries rely on the insertion and extraction of lithium ions at the positive and negative electrodes of the battery cells. The frequent insertion and extraction process easily damages or even collapses the microstructure of the positive and negative electrodes, thereby affecting the transmission efficiency of lithium ions and reducing the charging and discharging performance of the batteries; in addition, as the medium for lithium ions to shuttle between the positive and negative electrodes, the electrolyte will decompose and generate gases (such as carbon dioxide and hydrogen, etc.) during repeated charging and discharging. As the gases continue to accumulate, it will not only cause the battery cover to expand and deform, affecting the mechanical strength and packaging integrity of the battery, but may even increase the internal pressure of the battery cell, triggering safety risks and causing serious consequences such as liquid leakage, short circuit and even thermal runaway.

[0027] In addition, due to the continuous consumption of the electrolyte, the battery cells are prone to the problem of liquid shortage, which further exacerbates the aging of the batteries; more specifically, the problem of liquid shortage not only limits the effective migration path of ions in the electrolyte, increases the internal resistance of the battery cells, but may also cause the direct contact of the electrode materials, resulting in local overheating. In severe cases, it can cause a sharp drop in the battery capacity and shorten the service life of the batteries.

[0028] Therefore, how to effectively suppress the structural degradation, gas generation, and electrolyte loss during the cycling of battery cells has become a key technology for improving the comprehensive performance of batteries and ensuring safe use.

[0029] Among them, Figure 1 is a schematic structural diagram of an exhaust and liquid replenishment structure in this application.

[0030] In view of this, as Figure 1 shown, this application provides an exhaust and liquid replenishment structure disposed on the cover plate 100 of the battery cell. The exhaust and liquid replenishment structure includes a hollow structure 210, a guiding block 220, a first channel 230, and a second channel 240. Among them, the hollow structure 210 is disposed on the cover plate 100; the guiding block 220 is disposed through the hollow structure 210; the first channel 230 and the second channel 240 are disposed at both ends of the guiding block 220; the first ends of both are respectively communicated with the inside and the outside of the battery cell; during the reciprocating sliding of the guiding block 220 relative to the cover plate 100, the second ends of the first channel 230 and the second channel 240 are alternately communicated with the hollow structure 210 to perform gas exchange or liquid exchange between the inside and the outside of the battery cell through the hollow structure 210.

[0031] Among them, the first end and the second end of the first channel 230 are respectively disposed on opposite sides of the first channel 230; the first end and the second end of the second channel 240 are respectively disposed on opposite sides of the first channel 230.

[0032] As Figure 1 shown, this application provides an exhaust and liquid replenishment structure applied to a battery cell, which is disposed on the cover plate 100 of the battery cell, and the cover plate 100 is used for the battery cell; specifically, the exhaust and liquid replenishment structure includes a hollow structure 210 and a guiding block 220. The hollow structure 210 is disposed on the cover plate 100, and the guiding block 220 can penetrate through the hollow structure 210 and is slidably disposed on the cover plate 100; specifically, when using the exhaust and liquid replenishment structure to discharge the gas inside the battery cell, the gas inside the battery cell can be released into the hollow structure 210 through the guiding block 220 in the exhaust and liquid replenishment structure, and then the gas in the hollow structure 210 is released to the outside of the battery cell, reducing the difficulty of releasing the gas inside the battery cell and avoiding the expansion or deformation of the entire battery due to excessive gas inside the battery cell to ensure the performance of the battery; when using the exhaust and liquid replenishment structure to replenish the electrolyte, the electrolyte can be transferred into the hollow structure 210 through the guiding block 220, and then the electrolyte in the hollow structure 210 is transported into the battery; there is no need to disassemble the battery, the operation is simple and the difficulty is low, preventing the battery cell from experiencing a temperature runaway phenomenon due to too low electrolyte content, being beneficial to slowing down the aging speed of the battery cell and reducing the reduction degree of the battery capacity.

[0033] An exhaust and electrolyte replenishment structure disposed on the battery cell cover plate 100 serves both to release the gas inside the battery cell and replenish the electrolyte. Specifically, the exhaust and electrolyte replenishment structure further includes a first channel 230 and a second channel 240 disposed at opposite ends of the guiding block 220. Since the guiding block 220 is disposed through the hollow structure 210 and enables the guiding block 220 to slide on the cover plate 100 to change the position of the guiding block 220, so that the hollow structure 210 alternately establishes a communication relationship with the first channel 230 and the second channel 240 disposed at both ends of the guiding block 220, in order to realize the release of gas and the replenishment of electrolyte.

[0034] Regarding the first channel 230 and the second channel 240 in the exhaust and electrolyte replenishment structure, a first end and a second end are respectively disposed at opposite ends of the first channel 230 and opposite ends of the second channel 240. The exhaust and electrolyte replenishment structure can establish a communication relationship with the inside of the battery cell through the first end of the first channel 230 and establish a communication relationship with the outside of the battery cell through the first end of the second channel 240. Among them, the second end of the first channel 230 and the second end of the second channel 240 can be disposed on the side surface of the guiding block 220, and the guiding block 220 can be slidably disposed on the cover plate 100. When the guiding block 220 reciprocally slides relative to the side wall of the cover plate 100, at most one of the second end of the first channel 230 and the second end of the second channel 240 communicates with the hollow structure 210, that is, alternately communicates with the hollow structure 210, so that the hollow structure 210 can communicate with the inside of the battery cell or the outside of the battery cell. Specifically, when the hollow structure 210 communicates with the inside of the battery cell through the first channel 230, the gas inside the battery cell can be released into the hollow structure 210 through the first channel 230, or the electrolyte stored in the hollow structure 210 can be transported into the battery cell through the first channel 230. Similarly, when the hollow structure 210 communicates with the outside of the battery cell through the second channel 240, the gas inside the hollow structure 210 can be released to the outside of the battery cell through the second channel 240, and the electrolyte can also be transported from the outside of the battery cell to the hollow structure 210 through the second channel 240 for transfer and storage, that is, by sliding the driving block to realize the discharge of the battery cell gas and the replenishment of the electrolyte, which is beneficial to improving the overall quality and application performance of the battery and enhancing the safety of battery application.

[0035] Among them, Figure 2 is a schematic diagram of the state of the exhaust and electrolyte replenishment structure in the first working condition in this application, Figure 3 is a schematic diagram of the state of the exhaust and electrolyte replenishment structure in the second working condition in this application.

[0036] In some embodiments, the sliding process of the guiding block 220 relative to the cover plate 100 includes a first working condition and a second working condition. Among them, as Figure 2As shown, in the first working condition, the second end of the first channel 230 is in communication with the hollow structure 210, and the second end of the second channel 240 is not in communication with the hollow structure 210; so that the inside of the battery cell is in communication with the hollow structure 210, and the hollow structure 210 is not in communication with the outside of the battery cell; as Figure 3 As shown, in the second working condition, the second end of the first channel 230 is not in communication with the hollow structure 210, and the second end of the second channel 240 is in communication with the hollow structure 210; so that the inside of the battery cell is not in communication with the hollow structure 210, and the hollow structure 210 is in communication with the outside of the battery cell.

[0037] The guiding block 220 can slide relative to the cover plate 100. When the guiding block 220 is driven to slide, as the position of the guiding block 220 changes, the second end of the first channel 230 and the second end of the second channel 240 can be alternately in communication with the hollow structure 210, thereby enabling the hollow structure 210 to be alternately in communication with the inside and the outside of the battery cell; wherein, the sliding process of the guiding block 220 relative to the cover plate 100 includes the first working condition and the second working condition. Under different working conditions, the communication conditions between the hollow structure 210, the first channel 230 and the second channel 240 are different.

[0038] Specifically, as Figure 2 As shown, when adjusting the exhaust and liquid supplementing structure to the first working condition, a pulling force can be applied to the guiding block 220 outside the battery cell to make the guiding block 220 move in the direction of the cover plate 100 towards the outside of the battery cell; when the guiding block 220 moves to the specified position, the second end of the first channel 230 is in communication with the hollow structure 210, and the second end of the second channel 240 is blocked by the cover plate 100 and is not in communication with the hollow structure 210; at this time, the electrolyte stored in the hollow structure 210 can be transported to the inside of the battery cell through the first channel 230, or the gas inside the battery cell can be released into the hollow structure 210 through the first channel 230 for transfer storage.

[0039] Specifically, as Figure 3 As shown, when adjusting the exhaust and liquid supplementing structure to the second working condition, a pressure can be applied to the guiding block 220 outside the battery cell to make the guiding block 220 move in the direction of the cover plate 100 towards the inside of the battery cell; when the guiding block 220 moves to the specified position, the second end of the first channel 230 is blocked by the cover plate 100 and is not in communication with the hollow structure 210, and the second end of the second channel 240 is in communication with the hollow structure 210; at this time, the gas stored in the hollow structure 210 can be released to the outside of the battery cell through the second channel 240, or the electrolyte can be transported to the hollow structure 210 through the second channel 240 for storage.

[0040] It should be noted that when releasing the inside of the battery cell into the hollow structure 210 through the first channel 230 or delivering the electrolyte into the hollow structure 210 through the second channel 240, a negative pressure device can be used to create a negative pressure environment inside the hollow structure 210. Exemplarily, when the inside of the hollow structure 210 is in a negative pressure environment and the exhaust and liquid replenishment structure is adjusted to the first working condition, the gas inside the battery cell can enter the hollow structure 210 through the first channel 230 under the action of the air pressure difference, improving the speed at which the gas inside the battery cell enters the hollow structure 210 and enhancing the gas discharge effect of the hollow structure 210. When the inside of the hollow structure 210 is in a negative pressure environment and the exhaust and liquid replenishment structure is adjusted to the second working condition, the air pressure difference can be utilized to increase the delivery speed of the electrolyte entering the hollow structure 210 through the second channel 240, which is beneficial to improving the efficiency of the exhaust process and the liquid replenishment process.

[0041] Figure 4 Schematic diagram of another exhaust structure in this application Figure 5 Schematic diagram of a hollow structure 210 in this application

[0042] In some embodiments, such as Figures 1-5 shown, the exhaust and liquid replenishment structure further includes a limiting portion 250 and a mating portion 260. Among them, the limiting portion 250 is arranged on the side surface of the guiding block 220. The limiting portion 250 is configured to limit the sliding stroke of the guiding block 220 on the cover plate 100. There are two groups of mating portions 260, and the two groups of mating portions 260 are arranged on opposite sides of the hollow structure 210. The guiding block 220 is slidably arranged in the mating portion 260 and is adapted to the mating portion 260. The mating portion 260 is configured to limit the sliding trajectory of the guiding block 220 on the cover plate 100.

[0043] Such as Figures 1-5As shown in the figure, by driving the guiding block 220 in the exhaust and liquid replenishment structure to slide on the cover plate 100, the first channel 230 and the second channel 240 can be alternately communicated with the hollow structure 210; specifically, the exhaust and liquid replenishment structure further includes a limiting portion 250 and a mating portion 260; wherein, the limiting portion 250 is disposed on the side surface of the guiding block 220, and two sets of mating portions 260 can be provided, and each set of mating portions 260 is respectively disposed on opposite sides of the hollow structure 210, so that when the guiding block 220 penetrates through the hollow structure 210, it is slidably disposed within the limiting portion 250; when the guiding block 220 slides along the cover plate 100 to a specified position, the limiting portion 250 can abut against the edge of the mating portion 260, and the mating portion 260 restricts the guiding block 220 from continuing to move, so as to limit the sliding stroke of the guiding block 220; on the one hand, the limiting portion 250 disposed on the side surface of the guiding block 220 can prevent the guiding block 220 from disengaging from the cover plate 100, avoiding damage to the exhaust and liquid replenishment structure and affecting the integrity of the battery; on the other hand, under the limiting action of the limiting portion 250, at most one of the second ends of the first channel 230 and the second channel 240 can be communicated with the hollow structure 210, so that while the battery exhausts gas and replenishes electrolyte, its airtightness during the gas exchange and liquid exchange processes is ensured.

[0044] In addition, as Figures 1-5 shown, with respect to the mating portion 260 in the exhaust and liquid replenishment structure, two sets of mating portions 260 can be provided, and one set of mating portions 260 can be respectively disposed on opposite sides of the hollow structure 210, which can cooperate with the limiting portion 250 to limit the sliding stroke of the guiding block 220, so as to prevent the guiding block 220 from detaching from the cover plate 100 and causing damage to the exhaust and liquid replenishment structure; and since the guiding block 220 can be slidably disposed within the mating portion 260 in an adaptable manner, the sliding trajectory of the guiding block 220 on the cover plate 100 can be restricted, avoiding problems such as swinging or shaking of the guiding slider during the sliding process, so that the guiding block 220 can slide in a straight line, which is beneficial to ensuring the smoothness of the sliding of the exhaust and liquid replenishment structure.

[0045] It should be noted that, in order to limit the sliding trajectory of the guiding block 220 to cooperate with the guiding block 220 to achieve gas discharge and electrolyte replenishment of the battery core, as Figures 1-5 shown, the mating portion 260 can be set as a mating through hole, which can reduce the manufacturing difficulty of the mating portion 260 on the one hand, and enable the guiding block 220 to slide smoothly on the cover plate 100 on the other hand, which is beneficial to realizing gas exchange and liquid exchange of the battery core, and will not be elaborated here.

[0046] In some embodiments, the limiting portion 250 includes a limiting protrusion 251, the limiting protrusion 251 is disposed on the side surface of the guiding block 220 and protrudes in a direction away from the guiding block 220, and the limiting protrusion 251 is located within the hollow structure 210.

[0047] As Figures 1-3 shown, when the guiding block 220 slides towards the inside or outside of the battery cell, the limiting protrusion 251 provided on the surface of the guiding block 220 will move synchronously with the sliding of the guiding block 220; when the guiding block 220 slides to a specified position, the side surface of the limiting protrusion 251 close to or inside the battery cell will abut against the edge of the mating portion 260 to limit the further movement of the guiding slider, thereby realizing the limitation of the sliding stroke of the guiding block 220.

[0048] It should be noted that based on the limiting effect of the limiting protrusion 251 on the sliding stroke of the guiding block 220, the number of the limiting protrusions 251 can be determined according to the setting position and size of the limiting portion 250; exemplarily, as Figures 1-3 shown, when the limiting portion 250 is located inside the hollow structure 210, two groups of the limiting portions 250 can be provided, and at least one limiting portion 250 can be provided in each group, one group is provided close to the inside of the battery cell, and the other group is provided close to the outside of the battery cell, so as to limit the relative two sliding directions of the guiding block 220, which will not be elaborated here.

[0049] It should be noted that the shape of the limiting protrusion 251 can also be selected according to actual requirements and manufacturing costs; exemplarily, the limiting portion 250 can adopt a dot-shaped protrusion or a ring-shaped protrusion, and can be formed by an integral molding method, which will not be elaborated here.

[0050] As an alternative embodiment, as Figure 4 shown, the limiting portion 250 includes a limiting groove 252, the limiting groove 252 is provided on the side surface of the guiding block 220 and is recessed towards the direction close to the guiding block 220, and the side of the mating portion 260 close to the guiding block 220 slides adaptively in the limiting groove 252.

[0051] As Figure 4 shown, the exhaust and liquid supplementing structure can also include a limiting groove 252, the limiting groove 252 can be provided on the side surface of the guiding block 220 and is recessed towards the direction close to the guiding block 220; since the guiding block 220 is slidably provided on the cover plate 100 and the mating portion 260 is provided on the opposite sides of the hollow structure 210, when the guiding block 220 slides to a specified position, the inner side wall of the limiting groove 252 can abut against the edge of the mating portion 260 to limit the continuous movement of the guiding block 220; it can also prevent the guiding block 220 from disengaging from the cover plate 100 and damaging the exhaust and liquid supplementing structure; and it can also make at most one of the first channel 230 and the second channel 240 communicate with the hollow structure 210, improving the sealing integrity of the battery cover plate 100.

[0052] It should be noted that since the limiting groove 252 is used to limit the sliding stroke of the guiding block 220, its quantity can be determined according to the setting position and size of the limiting part 250; exemplarily, as Figure 4 shown, a set of limiting grooves 252 are formed on the side surface of the guiding block 220, and the engaging part 260 can slide within the limiting grooves 252. When driving the guiding block 220 to slide, the engaging parts 260 provided on the opposite sides of the hollow structure 210 can both slide within the limiting grooves 252; at this time, the shape of the limiting grooves 252 can be annular and arranged along the circumferential direction of the guiding block 220 to ensure the smoothness of the sliding of the guiding block 220, which will not be elaborated here.

[0053] In some embodiments, as Figures 1-5 shown, the exhaust and liquid replenishment structure further includes a first sealing ring 270 and a second sealing ring 280; the first sealing ring 270 and the second sealing ring 280 are located between the guiding block 220 and the engaging part 260, and the first sealing ring 270 and the second sealing ring 280 are arranged in a circumferential surrounding manner along the guiding block 220; the first sealing ring 270 is arranged relative to the second end of the hollow structure 210 away from the first channel 230; the second sealing ring 280 is arranged relative to the second end of the hollow structure 210 away from the second channel 240.

[0054] Regarding the first sealing ring 270 and the second sealing ring 280, as Figures 1-5 shown, the exhaust and liquid replenishment structure can release the gas inside the battery cell to the outside of the battery cell through the first channel 230 and the second channel 240 provided on the guiding block 220, and can also transport the electrolyte from the outside of the battery cell to the inside of the battery cell; wherein, the guiding block 220 in the exhaust and liquid replenishment structure penetrates through the hollow structure 210, and the guiding block 220 is slidably arranged within the engaging part 260. Since the two groups of engaging parts 260 are respectively arranged on the opposite sides of the hollow structure 210, by arranging the first sealing ring 270 and the second sealing ring 280 between the engaging part 260 and the guiding block 220, the sealing between the guiding block 220 and the engaging part 260 can be achieved, improving the sealing performance of the exhaust and liquid replenishment structure and the battery, and at the same time avoiding the second ends of the first channel 230 and the second channel 240 from being scratched by the corner areas of the engaging part 260 during the sliding process following the guiding block 220.

[0055] In addition, with respect to the first sealing ring 270, the first sealing ring 270 is arranged relative to the hollow structure 210 at the second end away from the first channel 230. That is, when the guiding block 220 slides towards the direction close to the inside of the battery cell, the second end of the first channel 230 will not slide past the first sealing ring 270, so that the first sealing ring 270 can limit and seal the second end of the first channel 230, ensuring the sealing effect of the second end of the first channel 230 in a state of being not connected to the hollow structure 210. Similarly, the second sealing ring 280 is arranged relative to the hollow structure 210 at the second end away from the second channel 240. That is, when the guiding block 220 slides towards the direction close to the outside of the battery cell, the second end of the second channel 240 will not slide past the second sealing ring 280, so that the second sealing ring 280 can limit and seal the second end of the second channel 240, ensuring the sealing effect of the second end of the second channel 240 in a state of being not connected to the hollow structure 210.

[0056] In some embodiments, as Figures 1-5 shown, a fitting groove 300 is provided on one side of the fitting portion 260 close to the guiding block 220. The first sealing ring 270 and the second sealing ring 280 are respectively embedded in a fitting groove 300 and are both adapted to the corresponding fitting groove 300.

[0057] Regarding the fitting groove 300, as Figures 1-5 shown, the first sealing ring 270 and the second sealing ring 280 arranged between the fitting portion 260 and the guiding block 220 are both used to improve the sealing effect of the exhaust and liquid replenishment structure, and are also used to prevent the second ends of the first channel 230 and the second channel 240 on the side wall of the guiding block 220 from being scratched by the corner regions of the fitting portion 260. Specifically, by providing a fitting groove 300 on one side of the fitting portion 260 close to the guiding block 220 and respectively fitting the first sealing ring 270 and the second sealing ring 280 into a fitting groove 300, the setting positions of the first sealing ring 270 and the second sealing ring 280 can be limited, so as to improve the firmness and reliability of the installation of the sealing ring on the cover plate 100 and prevent the sealing ring from falling off during the sliding of the guiding block 220.

[0058] In some embodiments, as Figures 1-5 shown, the hollow structure 210 includes a first recessed portion 2111 and a plugging portion 2112. The first recessed portion 2111 is provided on the cover plate 100 and is recessed towards the direction close to the inside of the battery cell. The plugging portion 2112 is embedded in the first recessed portion 2111 and is adapted to the opening of the first recessed portion 2111. Fitting portions 260 are respectively provided at the bottom of the cover plate 100 and the first recessed portion 2111. The cover plate 100 is configured to isolate the hollow structure 210 from the outside of the battery cell.

[0059] Regarding the hollow structure 210, as Figures 1-5As shown, during the exhaust process, the hollow structure 210 can store the gas released inside the battery cell through the first channel 230. As the guiding block 220 slides, the guiding block 220 can also release the gas to the outside of the battery cell through the second channel 240; during the electrolyte replenishment process, the electrolyte can be transported into the hollow structure 210 through the second channel 240 for storage, and then the electrolyte can be transported from the hollow structure 210 to the inside of the battery cell through the first channel 230 by the sliding of the guiding block 220; more specifically, the hollow structure 210 can include a first recess 2111 and a blocking portion 2112; the first recess 2111 can be arranged in the cover plate 100 and recessed towards the direction close to the inside of the battery cell, and the blocking portion 2112 is fitted into the first recess 2111 in cooperation to block the first recess 2111 and form a sealed storage space, improving the sealing performance of the hollow structure 210 and isolating the hollow structure 210 from the outside of the battery cell; using the blocking portion 2112 to block the first recess 2111 can simplify the assembly process when assembling the exhaust and electrolyte replenishment structure, which is beneficial to reducing the assembly difficulty of the exhaust and electrolyte replenishment structure, thereby reducing the cost investment of the battery.

[0060] In addition, since the cover plate 100 and the bottom of the first recess 2111 are respectively provided with a mating portion 260, the guiding block 220 can reciprocally slide on the cover plate 100 and the guiding block 220 is arranged to penetrate the hollow structure 210, so that the exhaust and electrolyte replenishment structure has the functions of gas exchange and liquid exchange.

[0061] Exemplarily, a gasket is arranged between the blocking portion 2112 and the cover plate 100, which can further seal between the two, being beneficial to improving the overall sealing performance of the hollow structure 210, and details are not described herein again.

[0062] Exemplarily, the blocking portion 2112 can be welded to the cover plate 100 by laser welding, which is beneficial to improving the firmness of the connection between the blocking portion 2112 and the cover plate 100, and details are not described herein again.

[0063] Figure 6 This is a schematic structural diagram of another hollow structure 210 in the present application.

[0064] In some embodiments, as Figure 6 shown, the hollow structure 210 includes a connecting portion 2121 and a second recess 2122. The connecting portion 2121 is arranged on the cover plate 100 and located inside the battery cell, and is configured to isolate the hollow structure 210 from the inside of the battery cell; the second recess 2122 is arranged on the side of the connecting portion 2121 close to the outside of the battery cell and recessed towards the direction close to the inside of the battery cell, and mating portions 260 are respectively arranged at the bottom of the second recess 2122 and the cover plate 100.

[0065] Regarding the hollow structure 210, asFigure 6 As shown, the hollow structure 210 may also include a connecting portion 2121 and a second recessed portion 2122; the connecting portion 2121 may be disposed on the cover plate 100 and inside the battery cell, and the second recessed portion 2122 is disposed on a side of the connecting portion 2121 close to the outside of the battery cell and is recessed toward the inside of the battery cell; at this time, a sealed storage space may be formed between the second recessed portion 2122 and the cover plate 100, which can transit and store the released gas during the exhaust of the battery cell, and can also transit and store the electrolyte to be supplemented during the process of supplementing the electrolyte; since the second recessed portion 2122 is opened on the connecting portion 2121, the mechanical strength of the cover plate 100 can be improved, which is beneficial to ensuring the overall safety of the battery.

[0066] In addition, since mating portions 260 are respectively provided at the bottoms of the connecting portion 2121 and the second recessed portion 2122, the guiding block 220 can reciprocally slide on the cover plate 100, and the guiding block 220 is disposed to penetrate through the hollow structure 210, so that the exhaust and liquid supplement structure has functions of gas exchange and liquid exchange.

[0067] It should be noted that the connecting portion 2121 and the cover plate 100 may be formed by an integral molding method, which is beneficial to improving the firmness of the connection between the hollow structure 210 and the cover plate 100 and the reliability of the cover plate 100, and will not be elaborated here.

[0068] In some embodiments, a guiding surface 400 is provided on the side surface of the hollow structure 210; the guiding surface 400 is inclined outward toward the direction close to the battery cell.

[0069] Specifically, as Figure 6 shown, the side surface of the hollow structure 210 may be a guiding surface 400 inclined outward toward the outside of the battery cell; wherein, when the hollow structure 210 stores electrolyte and the electrolyte flows into the inside of the battery cell through the first channel 230, the electrolyte can flow along the surface of the guiding surface 400, and the guiding surface 400 inclined outward toward the outside of the battery cell can reduce the residual degree of the electrolyte on its surface, so as to improve the smoothness of the electrolyte supplement.

[0070] Exemplarily, the hollow structure 210 is provided as a frustum, such as a frustum of a cone or a frustum of a pyramid; which is beneficial to improving the smoothness of the electrolyte conveyance in the hollow structure 210.

[0071] Exemplarily, the hollow structure 210 may also be a cylinder, such as a cylinder or a prism; which is beneficial to reducing the residual amount of the electrolyte in the hollow structure 210.

[0072] In some embodiments, as Figures 1-4 shown, a holding portion 500 is provided at the end of the guiding block 220, and the holding portion 500 is located outside the battery cell.

[0073] Regarding the holding portion 500, as Figures 1-4 shown, by providing the holding portion 500 at one end of the guiding block 220 away from the inside of the battery cell, a corresponding holding position can be provided. The user can apply a driving force (such as pressure or tensile force) to the guiding block 220 through the holding portion 500 to drive the guiding block 220 to slide relatively on the cover plate 100, thereby changing the position of the guiding block 220 so that the hollow structure 210 can communicate with the first channel 230 and the second channel 240 alternately.

[0074] It should be noted that some embodiments of the present application have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the above embodiments and still achieve the desired result. Additionally, the processes depicted in the figures do not necessarily require the particular order or sequential order shown to achieve the desired result. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0075] Each embodiment in the present application is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0076] The description of the present application is given for purposes of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the present application and its practical application, and to enable those of ordinary skill in the art to understand the present application and design various embodiments with various modifications suitable for a particular purpose.

[0077] Those of ordinary skill in the art should understand that: any discussion of the above embodiments is exemplary only, and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; under the concept of the present application, the technical features between the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

[0078] Although the present application has been described in connection with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description.

[0079] Embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of the present application shall be included within the protection scope of the present application.

Claims

1. An exhaust and liquid replenishing structure, arranged on the cover plate of a battery cell, characterized in that: The exhaust and liquid replenishment structure comprises: Hollow structure; A guide block is disposed through the hollow structure; A first channel and a second channel, wherein the first channel and the second channel are arranged at both ends of the guide block; the first ends of the two channels are respectively connected to the inside of the battery cell and the outside of the battery cell; during the reciprocating sliding of the guide block relative to the cover plate, the second end of the first channel and the second end of the second channel are alternately connected to the hollow structure.

2. The exhaust and liquid replenishing structure according to claim 1, characterized in that: The sliding process of the guide block relative to the cover plate includes a first working condition and a second working condition; In the first working condition, the second end of the first channel is connected to the hollow structure, and the second end of the second channel is not connected to the hollow structure; In the second working condition, the second end of the first channel is not connected to the hollow structure, and the second end of the second channel is connected to the hollow structure.

3. The exhaust and liquid replenishing structure according to claim 1, characterized in that: Also includes: A limiting portion is arranged on a side of the guide block; the limiting portion is configured to limit a sliding stroke of the guide block on the cover plate; There are two groups of matching parts, which are arranged on opposite sides of the hollow structure. The guide block is slidably arranged in the matching parts and adapted to the matching parts; the matching parts are configured to limit the sliding trajectory of the guide block on the cover plate.

4. The exhaust and liquid replenishing structure according to claim 3, characterized in that: The limiting part comprises: A limiting protrusion is arranged on a side of the guide block and is protruded in a direction away from the guide block, and the limiting protrusion is located in the hollow structure; or include: The limiting groove is arranged on the side of the guide block and is recessed toward the direction close to the guide block. The side of the matching portion close to the guide block adaptively slides in the limiting groove.

5. The exhaust and liquid replenishing structure according to claim 3 or 4, characterized in that: Also includes: The first sealing ring and the second sealing ring are located between the guide block and the matching portion, and the first sealing ring and the second sealing ring are arranged around the circumference of the guide block; the first sealing ring is arranged relative to the second end of the hollow structure away from the first channel; the second sealing ring is arranged relative to the second end of the hollow structure away from the second channel.

6. The exhaust and liquid replenishing structure according to claim 5, characterized in that: An embedding groove is arranged on one side of the matching portion close to the guide block, and the first sealing ring and the second sealing ring are respectively embedded in one of the embedding grooves and are both matched with the corresponding embedding grooves.

7. The exhaust and liquid replenishing structure according to claim 3, characterized in that: The hollow structure comprises: A first recessed portion is provided on the cover plate and is recessed toward a direction close to the inside of the battery cell; The sealing portion is embedded in the first recessed portion and matched with the opening of the first recessed portion; the matching portion is respectively provided on the cover plate and the bottom of the first recessed portion; the cover plate is configured to isolate the hollow structure from the outside of the battery cell.

8. The exhaust and liquid replenishing structure according to claim 3, characterized in that: The hollow structure comprises: A connecting portion, disposed on the cover plate and located inside the battery cell, configured to isolate the hollow structure from the inside of the battery cell; The second recessed portion is arranged on a side of the connecting portion close to the outside of the battery cell and is recessed toward the inside of the battery cell. The bottom of the second recessed portion and the cover plate are respectively provided with the matching portion.

9. The exhaust and liquid replenishing structure according to claim 1, characterized in that: A guide surface is disposed on the side of the hollow structure, and the guide surface is tilted outwardly toward a direction close to the battery core.

10. The exhaust and liquid replenishing structure according to claim 1, characterized in that: A gripping portion is protruding from the end of the guide block; the gripping portion is located outside the battery core.

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