Battery

Abstract

The invention relates to the technical field of batteries, and discloses a battery which is characterized in that a pressure piston device is ingeniously arranged on the lower surface of a top cover plate of the battery, a positive electrode side wire and a negative electrode side wire which are electrically connected with a positive electrode column and a negative electrode column respectively are arranged, and the pressure piston device is designed to be driven to move under the action of gas generated in the battery; according to the utility model, the positive pole and the negative pole are electrically connected with each other, so that the battery can be quickly identified and responded before thermal runaway of the battery, namely at the initial stage of gas generation of the battery, internal short circuit of the battery is formed, the SOC of the battery is reduced, and possible side reactions in the battery are effectively slowed down or inhibited; therefore, the thermal runaway phenomenon is obviously delayed and even prevented, or even if the thermal runaway is difficult to avoid completely, the severity of the thermal runaway can be greatly reduced, the safety of the battery is enhanced, and due to the mechanical driving design, the structure is simple, the reliability is high, and the anti-interference capability is strong.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery. BACKGROUND

[0002] With the vigorous development of new energy field, lithium ion batteries are increasingly widely used in the field of electric vehicle power systems and energy storage sites. However, such batteries have high activity and have potential risks of abuse in actual use, such as overcharging, overdischarging, suffering from severe thermal stress, and occurrence of internal short circuit.

[0003] When the battery is abused, its internal system will suffer a series of adverse effects, including accelerated aging of electrode materials, decomposition of electrolyte, and generation of gas. If the battery is in an abused state for a long time, it may cause serious battery swelling, forced opening of the explosion-proof valve, battery fire, and even explosion, which poses a serious threat to the life safety and property safety of the user.

[0004] The root cause of battery thermal runaway is that the negative electrode is embedded with a large amount of lithium elements, and the positive electrode becomes unstable during the deintercalation of lithium ions. Under high temperature conditions, this instability can trigger a series of side reactions, releasing a large amount of energy, and eventually leading to battery fire and explosion.

[0005] Before the battery explosion-proof valve opens and thermal runaway occurs, the battery will undergo a long process of side reactions, accompanied by gas generation and heat release, resulting in a sharp rise in internal gas pressure.

[0006] In order to prevent the battery from causing serious cavity explosion due to the generation of a large amount of gas during thermal runaway, current power batteries and energy storage batteries generally adopt a single explosion-proof valve top cover design. The opening pressure of these explosion-proof valves is usually set between 0.5 and 0.8 Mpa. When the internal pressure of the battery exceeds the limit of the explosion-proof valve, the gas will rush out through the explosion-proof valve, thereby releasing the pressure.

[0007] However, when the gas in the battery rushes out through the explosion-proof valve, it often means that the battery is already in a critical stage of thermal runaway. More seriously, the battery may still be in use, for example, when a new energy vehicle experiences thermal runaway, the vehicle is usually in a charging or driving state, and at this time the use of the battery cannot be immediately stopped. Especially in the charging or discharging state, the explosion speed of thermal runaway will be further accelerated, posing a more serious threat to the safety of the user.

[0008] Therefore, if the explosion of battery thermal runaway can be identified in advance, so that timely intervention measures such as stopping the use of the battery can be taken, it will be extremely likely to delay or prevent the occurrence of thermal runaway, or greatly reduce the severity of thermal runaway.

[0009] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the present disclosure. SUMMARY

[0010] The present application provides a battery to solve the problem that the thermal runaway of the battery cannot be identified in advance and even if intervention measures are taken.

[0011] To achieve the above object, the present application provides the following technical solutions:

[0012] A battery, comprising a shell, a winding core, a top cover plate, a pressure piston device, a positive pole, a negative pole, a positive side wire and a negative side wire; wherein,

[0013] The winding core is arranged in the shell, the top cover plate closes the shell, the top cover plate is provided with a positive pole hole and a negative pole hole, and has a lower surface facing the winding core;

[0014] The positive pole and the negative pole are respectively arranged in the positive pole hole and the negative pole hole and are electrically connected with the winding core;

[0015] The pressure piston device is arranged on the lower surface of the top cover plate and is located between the positive pole and the negative pole and can be driven to move under the action of the gas generated in the battery;

[0016] The positive side wire and the negative side wire are respectively arranged on the lower surface of the top cover plate, one end of each is electrically connected with the positive pole and the negative pole respectively, and the other end of each can be electrically connected with the pressure piston device when the pressure piston device is driven to move, so that an internal short circuit of the battery is formed.

[0017] Further, in the battery, the pressure piston device comprises a shell, a movable piece and a spring sheet;

[0018] The shell is arranged on the lower surface of the top cover plate;

[0019] One end of the shell facing the top cover plate is provided with a connecting port, and the positive side wire and the negative side wire extend into the connecting port;

[0020] The other end of the shell away from the top cover plate is provided with a groove, and the groove is in communication with the connecting port;

[0021] The spring sheet is arranged in the groove and is connected with the bottom wall of the groove;

[0022] The movable element is arranged in the groove and connected with the end of the spring sheet away from the bottom wall of the groove, and the movable element is driven to move into the connecting port under the action of the gas generated in the battery to be electrically connected with the end of the positive side wire and the negative side wire extending into the connecting port respectively.

[0023] Further, in the battery, the movable element comprises a gas bearing sheet, a connecting block and a conductive block.

[0024] The gas bearing sheet is connected with the spring sheet and is driven to move by overcoming the elastic deformation of the spring sheet under the action of the gas generated in the battery.

[0025] The connecting block is connected between the gas bearing sheet and the conductive block to drive the conductive block to move towards the top cover plate when the gas bearing sheet is driven to move.

[0026] The conductive block is at least partially arranged in the connecting port and is driven to move through the connecting port to be electrically connected with the positive side wire and the negative side wire under the action of the gas generated in the battery.

[0027] Further, in the battery, the pressure piston device further comprises a detent.

[0028] The side wall of the groove is provided with a containing hole.

[0029] The detent is arranged in the containing hole and can be ejected when the gas bearing sheet is driven to move to limit the gas bearing sheet and prevent the gas bearing sheet from being reset under the action of the spring sheet.

[0030] Further, in the battery, the pressure piston device further comprises a position fixing block.

[0031] The position fixing block is arranged on the side wall of the groove, and the position fixing block is configured to limit the gas bearing sheet when the gas bearing sheet is reset under the action of the spring sheet.

[0032] Further, in the battery, the conductive block is a resistance block, and the resistance value of the resistance block is R.

[0033] R=U max / I max , wherein U max is the maximum voltage of the battery, and I max is the maximum allowable current of the battery during operation.

[0034] The rate of the resistance block releasing electric energy is 512-3200J.

[0035] Further, in the battery, two notches are formed in one end of the shell towards the top cover plate, the two notches are arranged at two ends of the connecting port and communicate with the connecting port, and the two notches are configured to pass through the positive electrode side lead wire and the negative electrode side lead wire to extend into the connecting port.

[0036] Further, in the battery, the positive electrode side lead wire and the negative electrode side lead wire are both nickel filaments, the cross-sectional length is 0.2-0.5 cm, and the cross-sectional width is 0.01-0.05 cm.

[0037] Further, in the battery, the top cover plate is provided with an explosion-proof hole and a liquid injection hole, the explosion-proof hole is provided with an explosion-proof valve, the liquid injection hole is provided with a sealing spike, the pressure piston device is arranged between the positive electrode column and the explosion-proof valve, and the sealing spike is arranged between the negative electrode column and the explosion-proof valve.

[0038] The pressure required for driving the movement of the pressure piston device is less than the upper limit of the pressure of the explosion-proof valve and greater than the maximum pressure of the life cycle of the battery.

[0039] Further, in the battery, the battery further comprises a signal transmission device.

[0040] The top cover plate is provided with a transmission hole corresponding to the connecting port.

[0041] The signal transmission device is arranged on the upper surface of the top cover plate away from the winding core, the signal transmission device comprises a transmission member, one end of the transmission member is electrically connected with the BMS outside, the other end passes through the transmission hole and can be electrically connected with the conductive block when the conductive block is driven to move with the gas bearing piece, so as to transmit the early warning signal to the BMS.

[0042] Compared with the prior art, the present application has the following beneficial effects:

[0043] The battery provided by the application has an innovative battery design, specifically, a pressure piston device is ingeniously arranged at the lower surface of the top cover plate of the battery, and a positive electrode side lead wire and a negative electrode side lead wire electrically connected with the positive electrode column and the negative electrode column respectively are arranged, and the pressure piston device is designed to be driven to move under the action of the gas generated in the battery to be electrically connected with the positive electrode column and the negative electrode column respectively, so that the battery can be quickly identified and responded before thermal runaway of the battery, that is, in the initial stage of gas generation of the battery, so that the battery forms an internal short circuit to reduce the SOC of the battery, thereby effectively slowing down or inhibiting the possible side reaction in the battery, thereby significantly delaying or even preventing the occurrence of thermal runaway phenomenon, or even if thermal runaway is difficult to completely avoid, the severity can be greatly reduced, not only the safety of the battery is enhanced, a novel and efficient solution for battery thermal management is provided, and moreover, due to the mechanical driving design, the structure is simple, the reliability is high, and the anti-interference ability is strong.

[0044] The application has other characteristics and advantages, which will be obvious or will be described in detail in the drawings and subsequent specific embodiments incorporated herein, which are collectively used to explain the specific principles of the application. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0046] Figure 1 is one of the structural schematic diagrams of a battery (top cover plate part) provided by the embodiments of the application;

[0047] Figure 2 is the second structural schematic diagram of a battery (top cover plate part) provided by the embodiments of the application;

[0048] Figure 3 is one of the structural schematic diagrams of the pressure piston device provided by the embodiments of the application;

[0049] Figure 4 is the second structural schematic diagram of the pressure piston device provided by the embodiments of the application;

[0050] Figure 5 is the third structural schematic diagram of the pressure piston device provided by the embodiments of the application;

[0051] Figure 6Fig. 4 is a structural schematic diagram of a pressure piston device according to an embodiment of the present application;

[0052] Figure 7 Fig. 5 is a structural schematic diagram of a battery (overall) according to an embodiment of the present application;

[0053] Figure 8 Fig. 6 is a structural schematic diagram of a battery (top cover plate part) according to an embodiment of the present application.

[0054] Reference signs:

[0055] Top cover plate 1, pressure piston device 2, positive pole 3, negative pole 4, positive pole side wire 5, negative pole side wire 6, explosion-proof valve 7, signal transmission device 8, shell 9, winding core 10;

[0056] Housing 201, gas bearing sheet 202, connecting block 203, conductive block 204, position fixing block 205, notch 206, groove 207, welding fixing wing 208, clamping stopper 209, spring sheet 210, connecting port 211. DETAILED DESCRIPTION

[0057] To make the possible application scenarios, technical principles, specific schemes that can be implemented, purposes and effects that can be achieved of the present application clear, the following will be described in detail in combination with the specific embodiments listed and the accompanying drawings. The embodiments described in the present text are only used to more clearly illustrate the technical schemes of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0058] In the present text, the term “embodiment” means that the specific features, structures or characteristics described in combination with the embodiments can be contained in at least one embodiment of the present application. The term “embodiment” appearing at various positions in the specification does not necessarily refer to the same embodiment, and does not particularly limit the independence or association between other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical scheme.

[0059] Unless otherwise defined, the meanings of the technical terms used in the present text are the same as those generally understood by the person skilled in the art to which the present application belongs; the use of related terms in the present text is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0060] In the description of the present application, the phrase “and / or” is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character “ / ” in the present text generally represents that the associated objects before and after are a “or” logical relationship.

[0061] In the present application, the terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, primary or secondary, or order relationship between the entities or operations.

[0062] In the present application, the "includes", "contains", "has", or other similar expressions used in the statements are intended to cover non-exclusive inclusion, and the expressions do not exclude the presence of additional elements in the process, method or product comprising the elements, so that the process, method or product comprising a series of elements can not only include those defined elements, but also include other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0063] In the present application, the expressions such as "greater than", "less than", "exceed" are understood as not including the number; the expressions such as "above", "below", "within" are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise explicitly specified.

[0064] In the description of the embodiments of the present application, the spatial-related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. The indicated orientation or position relationship is based on the orientation or position relationship shown in the specific embodiment or the drawing, and is only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and does not indicate or imply that the indicated device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0065] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, the "connection" can be a fixed connection, or a detachable connection, or an integral setting; it can be a mechanical connection, or an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0066] Please refer toFigures 1-2 and Figure 7 The battery provided by the embodiment of the present application comprises a shell 9, a winding core 10, a top cover plate 1, a pressure piston device 2, a positive pole 3, a negative pole 4, a positive side wire 5 and a negative side wire 6; wherein,

[0067] The winding core 10, as the core component for realizing the storage and release of electric energy of the battery, is arranged inside the shell 9. The shell 9 provides a stable and sealed working environment for the winding core 10, effectively protecting the winding core 10 from the interference and damage of the external environment. The top cover plate 1 undertakes the important task of sealing the shell 9, and is provided with a positive pole hole and a negative pole hole. The two holes provide accurate positioning for the installation of the positive pole 3 and the negative pole 4, so as to facilitate the electrical connection with the winding core 10. At the same time, the top cover plate 1 has a lower surface facing the winding core 10, which provides a reasonable space layout for the installation and connection of other subsequent components.

[0068] The positive pole 3 and the negative pole 4 are respectively and stably arranged in the positive pole hole and the negative pole hole. They are not only the key channel for the transmission of electric energy between the battery and the external circuit, but also realize close electrical association with the winding core 10 through a clever electrical connection method, so as to ensure that the battery can normally perform charging and discharging operations.

[0069] The pressure piston device 2 is cleverly arranged on the lower surface of the top cover plate 1 and accurately located between the positive pole 3 and the negative pole 4. This unique layout not only can reasonably utilize the space between the positive pole 3 and the negative pole 4, shorten the length of the positive side wire 5 and the negative side wire 6, but also can make the gas generated inside smoothly contact the pressure piston device 2, so that the pressure piston device 2 can be timely driven to move under the action of the gas when the gas is generated inside the battery, improving the overall sensitivity. The working principle is based on the change of the gas pressure inside the battery. When the gas is generated inside the battery due to various reasons (such as overcharging, overheating, etc.), the pressure of the gas will push the pressure piston device 2 to displace, thereby triggering the subsequent change of electrical connection.

[0070] The positive side wire 5 and the negative side wire 6 are also arranged on the lower surface of the top cover plate 1. One end of each of them is in reliable electrical connection with the positive pole 3 and the negative pole 4 respectively, ensuring smooth transmission of current between the positive and negative poles. The other end of each of them is in electrical connection with the pressure piston device 2 when the pressure piston device 2 is driven to move. This design enables the positive side wire 5 and the negative side wire 6 to form an electrical path with the pressure piston device 2 when the pressure piston device 2 moves to a certain position under the action of gas, thereby causing the battery to form an internal short circuit. Specifically, the pressure piston device 2 is arranged between the positive pole 3 and the negative pole 4, and the positive side wire 5 is arranged between the positive pole 3 and the pressure piston device 2, and the negative side wire 6 is arranged between the negative pole 4 and the pressure piston device 2, so as to shorten the length of the conductive wire as much as possible and improve the space utilization. The battery design proposed in this embodiment has significant innovation and excellent performance advantages. The innovation mainly lies in the clever layout of the lower surface of the battery top cover plate 1. By carefully arranging the pressure piston device 2 at this position and reasonably arranging the positive side wire 5 and the negative side wire 6 in electrical connection with the positive pole 3 and the negative pole 4 respectively, a unique electrical response mechanism is constructed. The pressure piston device 2 can be driven to move under the action of gas in the battery and be in electrical connection with the positive pole 3 and the negative pole 4, which enables the battery to have the ability to sense internal abnormalities in advance.

[0071] Before the serious problem of battery thermal runaway occurs, i.e. in the initial stage of gas generation in the battery, this design can quickly identify and respond. When gas begins to be generated in the battery due to various potential factors (such as overcharging, short circuit, high temperature, etc.), the pressure piston device 2 will immediately feel the change in gas pressure and move, thereby triggering the electrical connection between the positive side wire 5 and the negative side wire 6 and the pressure piston device 2, causing the battery to form an internal short circuit. The internal short circuit will form a self-discharge process, and the lithium ions in the negative electrode will move to the positive electrode through the electrolyte and be embedded or deposited in the positive electrode. The reduction of lithium ions in the negative electrode means the reduction of active materials in the negative electrode, thereby reducing the possibility of side reactions in the negative electrode. The positive electrode becomes more stable after lithium embedding, reducing the decomposition reaction at high temperature, thereby jointly reducing the side reactions in the battery. These side reactions are often the key factors that trigger battery thermal runaway. By internal short circuit, the process of thermal runaway can be delayed, the risk of thermal runaway can be reduced, and the possibility of thermal runaway can be reduced from the source. At the same time, it can also achieve early warning of battery thermal runaway.

[0072] This design not only significantly delays or even prevents the occurrence of thermal runaway, providing a reliable guarantee for the safe operation of the battery, but also greatly reduces the severity of thermal runaway and the damage caused to the battery and users even if thermal runaway cannot be completely avoided. In addition, due to the use of mechanical driving, compared with other complex electronic control methods (such as electrical signal switches), this design has the advantages of simple structure, high reliability, strong anti-interference ability, and many others. It provides a novel and efficient solution for the field of battery thermal management, and is expected to play an important role in the future development of battery technology, promoting the further improvement of battery safety performance.

[0073] Please refer to Figures 3-6 In one embodiment of the present embodiment, the pressure piston device 2 is mainly composed of several key parts such as the shell 201, the movable part, and the spring sheet 210.

[0074] Firstly, the shell 201, as the basic support structure of the pressure piston device 2, is stably arranged on the lower surface of the top cover plate 1. This position is carefully considered to ensure that the pressure piston device 2 can be closely integrated with the overall structure inside the battery and can play the expected function in the battery internal environment. The overall shape and size of the shell 201 are designed to fully consider the matching with the top cover plate 1 and other related components to ensure the stability and reliability of the installation and avoid space occupation.

[0075] The end of the shell 201 facing the top cover plate 1 is provided with a connecting port 211. This connecting port 211 is the key link for the whole pressure piston device 2 to realize the electrical connection function. The positive side lead wire 5 and the negative side lead wire 6 are accurately wired and positioned to extend into the connecting port 211. This design enables the lead wire to form an effective electrical connection with the subsequent movable part under certain conditions, providing a physical basis for the realization of the internal short circuit mechanism of the battery.

[0076] At the end of the shell 201 away from the top cover plate 1, a groove 207 is arranged. The design of this groove 207 not only provides installation space for the movable part and the spring sheet 210, but also builds a channel for gas pressure conduction and movable part movement through communication with the connecting port 211. The shape, depth, and size of the groove 207 are accurately calculated and optimized to ensure that the movable part can move smoothly under the action of gas pressure and realize reliable connection with the lead wire.

[0077] The spring sheet 210 is ingeniously arranged in the groove 207 and is stably connected with the bottom wall of the groove 207. The material and elastic coefficient of the spring sheet 210 are strictly screened and tested to ensure that it can provide appropriate elastic force to keep the movable part in the initial position under the normal working state of the battery. At the same time, when a certain gas pressure change is generated in the battery, the spring sheet 210 can also be elastically deformed to allow the movable part to move under the action of pressure, thereby triggering the change of electrical connection.

[0078] The movable part, as the core functional component of the pressure piston device 2, is also arranged in the groove 207 and is tightly connected with the end of the spring sheet 210 away from the bottom wall of the groove 207. The shape and structure design of the movable part fully considers the flexibility of movement in the groove 207 and the contact reliability with the guide. Under the action of the gas generated in the battery, the gas pressure will be transmitted to the movable part, overcoming the elastic force of the spring sheet 210, to drive the movable part to move into the connecting port 211. When the movable part moves to a specific position in the connecting port 211, it can be electrically connected with the end of the positive side wire 5 and the negative side wire 6 extending into the connecting port 211, respectively. The formation of such electrical connection will cause the internal short circuit of the battery to achieve the safety protection function of the battery under certain conditions.

[0079] In summary, the pressure piston device 2 in the embodiment constructs a precise gas pressure sensing and electrical response mechanism through the cooperative work of the shell 201, the movable part and the spring sheet 210. The mechanism can quickly sense the pressure change through mechanical components when the gas is generated in the battery, and realize the internal short circuit of the battery through the movement of the movable part, thereby providing a reliable guarantee for the safe operation of the battery.

[0080] Please refer again to Figures 3-6 In an embodiment of the embodiment, the movable part adopts a cleverly designed structure which is composed of a gas bearing sheet 202, a connecting block 203 and a conductive block 204, and each part cooperates with each other to realize the specific function of the movable part in the pressure piston device 2.

[0081] Firstly, the gas bearing piece 202 plays a key role in sensing the change of gas pressure in the entire movable component structure. It is stably connected with the spring piece 210, and this connection ensures that the gas bearing piece 202 can maintain a relatively stable position in the initial state. When gas is generated inside the battery due to various factors (such as overcharging, chemical reactions caused by internal short circuit, etc.), the pressure of the gas will directly act on the gas bearing piece 202. Since the gas bearing piece 202 has a large force receiving area, it can quickly and effectively receive the gas pressure and convert it into an acting force. As the gas pressure gradually increases, the acting force will overcome the elastic deformation force generated by the spring piece 210. The spring piece 210 provides a reverse elastic force to the gas bearing piece 202 in the initial state, so that it is kept in a specific position. When the gas pressure is large enough, the gas bearing piece 202 will move under the drive of the gas pressure, and this movement process is an important starting link for the entire pressure piston device 2 to respond to the change of the internal gas of the battery.

[0082] The connecting block 203 serves as a connecting bridge between the gas bearing piece 202 and the conductive block 204, and plays a key role in transmitting motion. It is fixed between the gas bearing piece 202 and the conductive block 204 in a reliable connection manner, ensuring that the three form a whole motion unit. When the gas bearing piece 202 starts to move under the action of the gas pressure, the connecting block 203 will move synchronously and transmit the movement to the conductive block 204. The design of the connecting block 203 not only considers the firmness of the connection, but also fully considers the stability and accuracy in the process of transmitting motion, so as to ensure that the conductive block 204 can move in the expected direction and trajectory.

[0083] The conductive block 204 is the core component of the movable component that realizes the electrical connection function. It is at least partially arranged in the connecting port 211, and this layout makes the conductive block 204 have a certain positional relationship with the connecting port 211 in the initial state, which prepares for the subsequent electrical connection. Under the action of the internal gas pressure of the battery, with the movement of the gas bearing piece 202 and the transmission of the connecting block 203, the conductive block 204 will be driven to move and pass through the connecting port 211. When the conductive block 204 moves to a specific position, it can realize electrical connection with the one end of the positive side lead wire 5 and the negative side lead wire 6 that extends into the connecting port 211. By connecting the conductive block 204 with the positive side lead wire 5 and the negative side lead wire 6, the connection reliability can be improved, and the contact failure caused by vibration and other factors can be avoided.

[0084] In summary, the movable component in the embodiment constructs an efficient gas pressure sensing and electrical response mechanism through the precise cooperation of the gas bearing piece 202, the connecting block 203 and the conductive block 204. This mechanism can accurately sense the change of the internal gas pressure of the battery, and realize the internal short circuit of the battery through the movement of the movable component.

[0085] Please refer again to Figure 6 In one embodiment of the present embodiment, the pressure piston device 2 is further ingeniously provided with a key component, i.e., a detent 209, which further optimizes the working performance and reliability of the pressure piston device 2.

[0086] Specifically, a receiving hole (not shown) is arranged on the side wall of the groove 207. The receiving hole is designed with a size suitable for the detent 209 and provides a stable and suitable installation space for the detent 209. The position of the receiving hole is also crucial, which ensures that the detent 209 can play a role at the right time during the normal operation of the pressure piston device 2.

[0087] The detent 209 is properly arranged in the receiving hole and is in a storage state in the initial state without interfering with the normal operation of the pressure piston device 2 due to being blocked by the gas bearing sheet 202. The material and structure design of the detent 209 are strictly screened and optimized to ensure that it has sufficient strength and elasticity to quickly pop out and achieve the limiting function when needed.

[0088] When the battery generates gas due to various reasons, the gas pressure acts on the gas bearing sheet 202 to drive the gas bearing sheet 202 to move against the elastic deformation of the spring sheet 210. During the movement of the gas bearing sheet 202, when the gas bearing sheet 202 leaves the position corresponding to the receiving hole, the detent 209 will quickly pop out from the receiving hole because it is no longer blocked by the gas bearing sheet 202. The popped-out detent 209 precisely limits the gas bearing sheet 202, and the limiting effect mainly reflects the prevention of the gas bearing sheet 202 from returning to the initial position under the action of the spring sheet 210.

[0089] The spring sheet 210 provides a reverse elastic force to the gas bearing sheet 202 in the initial state to try to make the gas bearing sheet 202 return to the initial position. However, the popping out of the detent 209 breaks this balance, which acts as a solid barrier to block the resetting path of the gas bearing sheet 202. This limiting mechanism has important practical significance, which can ensure that the electrical connection state caused by the gas bearing sheet 202 under the action of the gas pressure in the battery is maintained.

[0090] For example, when the movement of the gas bearing piece 202 causes the electrically conductive block 204 to be electrically connected with the positive electrode side lead wire 5 and the negative electrode side lead wire 6, forming an internal short circuit of the battery, the limiting function of the detent 209 can prevent the electrically conductive block 204 from being disconnected with the lead wire, thereby ensuring that the internal short circuit state lasts for a period of time. This period of time is sufficient for the battery management system to timely detect the abnormal state of the battery and take appropriate protective measures, such as cutting off the connection of the battery with the external circuit, starting the heat dissipation system, etc. In this way, the detent 209 effectively enhances the function of the pressure piston device 2 in the safety protection of the battery, further improving the stability and reliability of the battery in the face of abnormal conditions.

[0091] Referring again to Figure 6 In an embodiment of the present embodiment, the pressure piston device 2 is also ingeniously added with a key component, the position fixing block 205, which plays a crucial role in optimizing the overall performance and operational stability of the pressure piston device 2.

[0092] Specifically, the position fixing block 205 is precisely set on the side wall of the groove 207. This setting position is not randomly selected, but is carefully analyzed and designed in terms of mechanics and structure. Specifically, it can be set on the side of the detent 209 away from the bottom wall of the groove 207. The groove 207 serves as a key space for the movement of the internal moving parts of the pressure piston device 2, and its side wall provides a stable mounting basis for the fixing block 205. The shape, size and connection method of the fixing block 205 with the side wall of the groove 207 are carefully designed to ensure that it can play a reliable limiting role in the working process of the pressure piston device 2.

[0093] In the normal working cycle of the pressure piston device 2, when the internal gas pressure of the battery disappears or decreases to a certain extent, the spring piece 210 will exert a reverse force on the gas bearing piece 202 due to its own elastic properties, trying to make the gas bearing piece 202 return to the initial position (this case is assumed that there is no detent 209, or the detent 209 is stored in the containing hole). At this time, the position fixing block 205 plays a key limiting role. Alternatively, when no side reaction occurs in the battery, the gas bearing piece 202 blocks the detent 209, making it be stored in the containing hole. At this time, the fixing block 205 can prevent the gas bearing piece 202 from leaving the groove 207, avoiding the problem of interference or damage to other structures in the battery caused by the gas bearing piece 202 leaving the groove 207.

[0094] When the gas bearing piece 202 starts to reset under the action of the spring piece 210, the position fixing block 205 will act as an accurate stopper to block the movement of the gas bearing piece 202 to a specific position. This specific position is calculated accurately, which ensures that the gas bearing piece 202 can be in a stable and appropriate working state after resetting, neither affecting the response of the pressure piston device 2 to the gas pressure in the next cycle due to excessive resetting, nor causing interference or abnormal wear between internal structures of the device due to insufficient resetting.

[0095] From the perspective of mechanics, the interaction between the position fixing block 205 and the gas bearing piece 202 is a typical limiting constraint process. When the gas bearing piece 202 contacts the position fixing block 205, the position fixing block 205 will exert a counterforce on the gas bearing piece 202, which balances the force exerted by the spring piece 210 on the gas bearing piece 202, so that the gas bearing piece 202 stops moving and stabilizes at the preset position.

[0096] This limiting mechanism has important significance in many aspects. First, it ensures that the pressure piston device 2 can recover to a consistent and reliable state after each working cycle, improving the repeatability and stability of the device. Second, the limiting action of the position fixing block 205 helps to reduce the vibration and shaking of the gas bearing piece 202 during the process of no side reaction or resetting, reducing the risk of damage to internal parts of the device due to frequent collisions, and prolonging the service life of the pressure piston device 2. In addition, accurate positioning can ensure that the pressure piston device 2 can accurately perceive the change of the gas pressure in the battery in the subsequent work, and trigger the corresponding electrical response in time, providing continuous and effective protection for the safe operation of the battery.

[0097] In summary, the position fixing block 205, through its accurate setting on the side wall of the groove 207 and reliable limiting of the resetting process of the gas bearing piece 202, further perfects the functional system of the pressure piston device 2.

[0098] Please refer to Figures 3-4 In one embodiment of the present embodiment, the end of the shell 201 facing the top cover plate 1 is designed ingeniously, i.e. two notches 206 are specially provided. The positions of the two notches 206 are not random, but are carefully planned and arranged, which are accurately arranged at the two ends of the connecting port 211 and closely communicate with the connecting port 211.

[0099] From the perspective of structural design, the shape, size, and relative position of the two notches 206 to the connecting port 211 are carefully considered. The shape of the notches 206 is designed to facilitate the smooth passage of the positive-side lead wire 5 and the negative-side lead wire 6, while ensuring that the overall structural integrity and sealing of the shell 201 are not significantly affected after the lead wires pass through. The size is determined according to the outer diameter of the positive-side lead wire 5 and the negative-side lead wire 6 and the operational space requirements during installation, ensuring that the lead wires can be easily inserted, while avoiding excessive notches that may compromise the protective performance of the shell 201.

[0100] The core function of the two notches 206 is to provide a passage for the positive-side lead wire 5 and the negative-side lead wire 6 to smoothly extend into the connecting port 211. In the actual battery assembly process, the positive-side lead wire 5 and the negative-side lead wire 6 need to establish reliable electrical connection with the conductive components (i.e., the conductive block 204) inside the pressure piston device 2 to realize the normal charging and discharging function of the battery. The two notches 206 serve as a bridge for the connection of the lead wires with the internal components of the device, while also avoiding displacement of the conductive parts and improving electrical connection reliability.

[0101] When assembling the battery, the operator can align the positive-side lead wire 5 and the negative-side lead wire 6 with the two notches 206 respectively, and then slowly insert the lead wires through the notches and into the connecting port 211. In this process, the edges of the notches 206 will guide and position the lead wires, ensuring that the lead wires can accurately reach the designated position in the connecting port 211 and make good contact with the internal conductive block 204 and other components.

[0102] From the perspective of electrical connection, this design ensures the stability and reliability of the connection between the positive-side lead wire 5 and the negative-side lead wire 6 and the internal components of the pressure piston device 2. Due to the communication design of the notches 206 and the connecting port 211, the lead wires can directly enter the connecting port 211 after passing through the notches, reducing the bending and twisting of the lead wires during the connection process and reducing the risk of electrical failure caused by poor contact of the lead wires.

[0103] In addition, the arrangement of the two notches 206 corresponding to the positive-side lead wire 5 and the negative-side lead wire 6 also reflects the symmetry and standardization of the design. This symmetrical design not only makes the appearance of the shell 201 more beautiful, but also makes the electrical layout more reasonable, which helps to improve the electrical performance and safety of the battery.

[0104] In summary, the two notches 206 on the shell 201 provide a reliable passage for the positive-side lead wire 5 and the negative-side lead wire 6 through their precise position setting, reasonable shape and size design, and close communication with the connecting port 211, ensuring stable electrical connection between the lead wires and the internal components of the pressure piston device 2.

[0105] Please refer again to Figures 3-6 In one embodiment of the present embodiment, the two sides of the shell 201 are provided with welding fixing wings 208. The design of the welding fixing wings 208 is not arbitrary, but has been considered from multiple aspects. From the perspective of structural strength, the shape and size are precisely calculated and optimized to ensure that sufficient connection area and mechanical strength can be provided during welding to form a stable connection between the shell 201 and the top cover plate 1. Moreover, the relative direction of the welding fixing wings 208 is perpendicular to the relative direction of the two notches 206. How to arrange not only facilitates the avoidance of the positive side lead wire 5 and the negative side lead wire 6, but also makes the welding position away from the positive side lead wire 5 and the negative side lead wire 6 and the connection port 221, avoiding internal short circuit caused by misoperation during welding. The material of the welding fixing wings 208 has good compatibility with the material of the shell 201 and the top cover plate 1, which can achieve good fusion during welding and avoid welding defects such as pores and cracks, thereby ensuring the reliability and durability of the connection.

[0106] During actual assembly, the welding fixing wings 208 are fixed and assembled with the lower surface of the top cover plate 1. The selection of welding process is crucial, and advanced laser welding or resistance welding technology is usually used. Laser welding has the advantages of high energy density, fast welding speed, and small heat-affected zone, which can ensure the welding quality while reducing the thermal damage to other components inside the battery. Resistance welding has the characteristics of simple operation and low cost, which is suitable for large-scale production. During welding, welding parameters such as welding current, welding time, and welding pressure are strictly controlled to ensure the consistency and stability of the welding quality.

[0107] The fixed assembly of the welding fixing wings 208 and the lower surface of the top cover plate 1 brings many advantages to the battery. First of all, this connection method can effectively prevent the relative displacement between the shell 201 and the top cover plate 1, ensuring the sealing and stability of the overall structure of the battery. During the use of the battery, it may be subjected to various external forces, such as vibration and impact. The presence of the welding fixing wings 208 can ensure the close combination of the shell 201 and the top cover plate 1. Secondly, this assembly method is convenient for the automated production and quality control of the battery. The design of the welding fixing wings 208 makes the assembly process more standardized and standardized, which can be quickly and accurately assembled by automated equipment, improving production efficiency and reducing production cost. At the same time, the detection of welding quality is relatively easy, and non-destructive testing techniques such as X-ray detection and ultrasonic detection can be used to comprehensively check the welding joint to ensure that the connection quality of each battery meets the requirements.

[0108] In an embodiment of the present embodiment, the shell 201, the gas bearing sheet 202, the connecting block 203 and the position fixing block 205 are all made of PP material which is resistant to corrosion and high temperature. PP material has a series of excellent properties, making it an ideal choice for the above-mentioned components. In terms of corrosion resistance, PP material has good resistance to common chemicals such as electrolyte and additives inside the battery, and can maintain the chemical stability of the material under long-term chemical corrosion, and is not prone to chemical reaction to cause performance degradation or damage of the material, thereby effectively prolonging the service life of the component. In terms of high temperature resistance, PP material can maintain its physical properties and mechanical strength under high temperature environment generated during battery operation, and will not soften or deform due to temperature rise, ensuring the integrity and stability of the internal structure of the battery. In addition, PP material also has the advantages of light weight and good processing performance, which is beneficial to the lightweight design and mass production of the battery.

[0109] The spring sheet 210 and the welding fixing wing 208 are made of stainless steel or nickel metal. Stainless steel has excellent corrosion resistance and can maintain a smooth surface in the chemical environment inside the battery for a long time, and is not prone to rust and corrosion, thereby ensuring that the elastic properties of the spring sheet 210 and the connection strength of the welding fixing wing 208 are not affected. At the same time, stainless steel also has high strength and hardness, which can meet the fatigue resistance requirements of the spring sheet 210 in the process of repeated elastic deformation, and the strength requirements of the welding fixing wing 208 when bearing external force. Nickel metal also has good corrosion resistance and high temperature stability, and its electrical conductivity and thermal conductivity are also excellent. During the operation of the battery, nickel metal can adapt to temperature changes and maintain the stability of its physical properties, and its good electrical conductivity helps the electrical connection inside the battery. In addition, nickel metal has good processing performance, which is convenient for making spring sheets and welding fixing wings of various shapes to meet the diversification needs of battery design.

[0110] In summary, the selection of materials for the shell 201, the gas bearing sheet 202, the connecting block 203, the position fixing block 205, the spring sheet 210 and the welding fixing wing 208 in the present embodiment is based on the overall consideration of battery performance, safety and reliability, and through scientific and reasonable material selection, it provides a solid guarantee for the stable operation and long life of the battery.

[0111] Please refer again to Figures 1-2 In an embodiment of the present embodiment, the top cover plate 1 is designed functionally and finely, and the anti-explosion hole and the liquid injection hole are arranged on it.

[0112] The explosion-proof hole is an important passage for battery safety protection, and an explosion-proof valve 7 is carefully arranged inside. The explosion-proof valve 7 is a key component to ensure the safety of the battery in extreme conditions. It is designed with special materials and structure, and has precise pressure response characteristics. When the internal pressure of the battery rises sharply due to various abnormal conditions (such as overcharging, internal short circuit, etc.), once the pressure reaches the set upper limit of the opening pressure of the explosion-proof valve 7, the explosion-proof valve 7 will quickly break or open, quickly discharging the high-pressure gas inside the battery, thereby avoiding the explosion of the battery due to excessive pressure, greatly improving the safety of the battery in use.

[0113] The liquid injection hole is a key passage for injecting electrolyte during battery production. In the early stage of battery assembly, an appropriate amount of electrolyte is injected into the battery through the liquid injection hole to ensure that the battery can normally perform electrochemical reactions. After the injection is completed, in order to prevent electrolyte leakage and foreign matter from entering the battery, a sealing pin is arranged in the liquid injection hole. The sealing pin is designed to tightly fit the liquid injection hole, which can effectively seal the liquid injection hole and ensure the sealing and stability of the battery.

[0114] The position of the pressure piston device 2 on the top cover plate 1 is carefully planned, and it is arranged between the positive pole 3 and the explosion-proof valve 7. This position selection has multiple considerations. On the one hand, the positive pole 3 is a key component for the positive current output of the battery, and the pressure piston device 2 is arranged close to the positive pole 3 to facilitate connection and cooperation with the internal electrical system of the battery. On the other hand, it is arranged near the explosion-proof valve 7, which can respond in time and take appropriate measures when the internal pressure of the battery is abnormal, forming a double safety protection with the explosion-proof valve 7.

[0115] At the same time, the sealing pin is arranged between the negative pole 4 and the explosion-proof valve 7. Such a layout makes the distribution of each key component on the top cover plate 1 reasonable in space, ensuring the independence and effectiveness of each component function, and avoiding interference between components.

[0116] The pressure required for the driven movement of the pressure piston device 2 is a key technical parameter, which is accurately set to be less than the upper limit of the pressure of the explosion-proof valve 7, and greater than the maximum pressure of the battery's life cycle. This setting has profound scientific basis and practical significance.

[0117] When the battery is in normal use, a certain pressure will be generated inside, and this pressure will change with the charge and discharge cycle of the battery, but it will always be within the maximum pressure range of the battery's life cycle. Since the driving pressure of the pressure piston device 2 is greater than the maximum pressure of the battery's life cycle, the pressure piston device 2 will not be misdriven due to normal internal pressure changes when the battery is working normally, thereby ensuring the normal charge and discharge function and stability of the battery.

[0118] However, when the battery encounters abnormal conditions such as internal short circuit, overcharge, etc., leading to a sharp rise in internal pressure, and the pressure exceeds the maximum pressure of the battery's life cycle, as long as the pressure has not reached the upper limit of the pressure of the explosion-proof valve 7, the pressure piston device 2 will be driven to move. The movement of the pressure piston device 2 will trigger a series of electrical responses, such as forming a short circuit inside the battery, thereby changing the electrical characteristics of the battery, notifying the battery management system through the electrical connection, prompting the battery management system to detect the abnormality in time and take appropriate protective measures, such as cutting off the connection between the battery and the external circuit, starting the heat dissipation system, etc. In this way, the pressure piston device 2 can respond and handle the abnormal pressure of the battery in advance before the explosion-proof valve 7 opens, effectively delaying or avoiding the occurrence of battery thermal runaway, providing an additional level of protection for the safe operation of the battery.

[0119] If the internal pressure of the battery continues to rise and eventually reaches the pressure upper limit of the explosion-proof valve 7, the explosion-proof valve 7 will open to release pressure, which is the last line of defense for the safety of the battery. This pressure setting relationship between the pressure piston device 2 and the explosion-proof valve 7 forms a complete safety system from early warning to final protection, fully guaranteeing the safety of the battery under various working conditions.

[0120] Please refer to Figure 1 , in combination with Figure 8 , in one embodiment of the present embodiment, the battery is additionally provided with a signal transmission device 8, which brings a more intelligent and efficient solution for the safety monitoring and management of the battery.

[0121] The top cover plate 1 is provided with a transmission hole, and the transmission hole is accurately corresponding to the connecting port 211 on the pressure piston device 2. This corresponding relationship builds a key channel for the electrical connection between the signal transmission device 8 and the pressure piston device 2. The shape, size and position of the transmission hole are strictly considered, which not only ensures that the transmission part of the signal transmission device 8 can pass through smoothly, but also ensures that the overall sealing performance and structural strength of the top cover plate 1 are not affected.

[0122] The signal transmission device 8 is cleverly arranged on the upper surface of the top cover plate 1 away from the winding core 10. Such a position selection has many advantages. On the one hand, it is convenient to connect and transmit signals with external equipment, reducing the complexity and interference of the line; on the other hand, the design away from the winding core 10 can avoid the influence of the signal transmission device 8 by the heat and electromagnetic interference generated by the winding core 10 during work, ensuring the stability and accuracy of signal transmission.

[0123] The core component of the signal transmission device 8 is the transmission piece. The transmission piece is made of high-performance conductive material, with low resistance and high stability, ensuring that the signal is not distorted or attenuated during transmission. One end of the transmission piece is electrically connected to the external battery management system (BMS). The BMS, as the "brain" of the battery, is responsible for monitoring and managing various parameters of the battery, such as voltage, current, temperature, etc., and making reasonable control and protection of the battery based on these parameters. The connection between the transmission piece and the BMS adopts a reliable interface design, ensuring the stability and safety of the electrical connection.

[0124] The other end of the transmission piece passes through the transmission hole on the top cover plate 1 and extends to the inside of the pressure piston device 2. In the normal working state of the battery, the conductive block 204 is in the initial position, and the transmission piece is disconnected with the conductive block 204, at this time no early warning signal is generated. However, when the battery inside produces gas due to abnormal conditions, causing the gas pressure to act on the gas bearing piece 202, driving the gas bearing piece 202 to move against the elastic deformation of the spring piece 210, the conductive block 204 will move with the gas bearing piece 202.

[0125] When the conductive block 204 moves to a certain position, it will realize electrical connection with the transmission piece passing through the transmission hole. This instantaneous electrical connection changes the electrical state inside the battery, forming a pre-warning signal. The pre-warning signal is quickly transmitted to the external BMS through the transmission piece. After receiving the pre-warning signal, the BMS will immediately analyze and evaluate the state of the battery, and take appropriate measures according to the preset protection strategy, such as reducing the charging current, cutting off the connection between the battery and the external circuit, starting the cooling system, etc., to prevent the battery from further deterioration and ensure the safe operation of the battery. In this embodiment, when the conductive block 204 moves to the position of the positive side lead 5 and the negative side lead 6, it simultaneously realizes electrical connection with the positive side lead 5 and the negative side lead 6, and electrical connection with the transmission piece, thereby initiating internal short circuit and pre-warning signal, improving overall reliability.

[0126] From the principle of signal transmission, the electrical connection between the transmission piece and the conductive block 204 is equivalent to the closure of a switch, which quickly and accurately transmits the abnormal state inside the battery to the BMS in the form of an electrical signal. This signal transmission method has the characteristics of fast response speed and high reliability, and can timely issue a pre-warning in the early stage of battery abnormalities, providing strong support for the safe management of the battery.

[0127] In addition, the design of the signal transmission device 8 also considers the compatibility and integration with the overall structure of the battery. It is closely matched with components such as the top cover plate 1 and the pressure piston device 2, and does not interfere with the normal assembly and use of the battery. At the same time, the appearance design and material selection of the signal transmission device 8 are coordinated with the overall style of the battery, ensuring functionality while also considering aesthetics.

[0128] In summary, the signal transmission device 8 realizes precise electrical connection with the conductive block 204 inside the pressure piston device 2 through the transmission hole on the top cover plate 1, can timely transmit the early warning signal to the BMS when the battery is abnormal, provides an intelligent monitoring and protection mechanism for the safe operation of the battery, and further improves the safety and reliability of the battery.

[0129] In an embodiment of the present embodiment, the conductive block 204 is a resistance block, and the resistance of the resistance block is R;

[0130] R=U max / I max , wherein U max is the maximum voltage of the battery, which reflects the highest potential difference that the battery can reach under extreme working conditions, and is an important indicator for measuring the output capacity of the battery; I max is the maximum allowable current of the battery during operation, which reflects the maximum current intensity that the battery can withstand within the safety range, and is of key significance to the safe operation of the battery and the prevention of overcurrent damage; The resistance value R of the resistance block can ensure that the resistance block effectively regulates and controls the current and voltage during the operation of the battery, so that the electrical parameters of the battery are always maintained within a safe and stable range.

[0131] In addition, in the present embodiment, the resistance block also has specific electric energy release characteristics. After a large number of experimental tests and theoretical analysis, it is determined that the rate at which the resistance block releases electric energy is in the interval of 512-3200J. The setting of this rate range is based on comprehensive consideration of many aspects. From the perspective of safety protection of the battery, when the battery is internally short-circuited, the resistance block can release electric energy at the set rate, safely dissipate the excess energy inside the battery in the form of heat energy, thereby avoiding serious safety accidents such as explosion and fire of the battery caused by energy accumulation in the battery. From the perspective of performance optimization of the battery, appropriate electric energy release rate can reduce the energy loss of the battery when internally short-circuited, reduce the thermal damage to the internal structure of the battery, and prolong the service life of the battery.

[0132] In one embodiment of the present embodiment, requirements are proposed for the material selection and specification of the positive-side lead wire 5 and the negative-side lead wire 6. After comprehensively considering various factors such as the electrical performance of the battery, the electrical conductivity efficiency, the mechanical strength, and the compatibility with other components inside the battery, it is determined that the positive-side lead wire 5 and the negative-side lead wire 6 are both made of nickel ribbon. The nickel ribbon has many excellent properties. It has good electrical conductivity, can effectively reduce the resistance loss in the current transmission process, and ensures the stable transmission of the current during the charging and discharging process of the battery. At the same time, the nickel ribbon also has excellent corrosion resistance and can maintain stable performance in the complex internal chemical environment of the battery for a long time, and is not easy to oxidize or deteriorate due to the corrosion of the electrolyte, thereby prolonging the service life of the lead wire and ensuring the long-term reliable operation of the battery.

[0133] In terms of the cross-sectional size design of the lead wire, after a large number of experimental verification and theoretical calculation, the cross-sectional length of the positive-side lead wire 5 and the negative-side lead wire 6 is accurately set in the range of 0.2-0.5 cm, and the cross-sectional width is strictly controlled in the interval of 0.01-0.05 cm. Such cross-sectional size design is based on scientific basis and practical experience in many aspects. From the perspective of electrical conductivity performance, appropriate cross-sectional length and width can ensure that the lead wire has sufficient current-carrying capacity to meet the current demand of the battery under different working conditions, avoid overheating phenomenon when the current is too large due to too small cross-sectional area of the lead wire, and thus affect the safety and performance stability of the battery. From the perspective of mechanical strength, the size range can make the lead wire withstand certain external force during the assembly, transportation and use of the battery, and is not easy to break or deform, thereby ensuring the reliability of the connection between the lead wire and the internal electrode and other components of the battery. In addition, reasonable cross-sectional size is also helpful to optimize the space layout inside the battery, so that the lead wire can be closely matched with other components, and the overall structural compactness and integration of the battery are improved.

[0134] Although the terms such as top cover plate and pressure piston device are used more in the present application, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present application; any kind of additional limitation is contrary to the spirit of the present application.

[0135] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of the present application, the patent protection scope of the present application should not be limited. Any equivalent structure or equivalent process substitution or modification based on the essential concept of the present application, using the content described in the specification and drawings of the present application, and directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are all included in the patent protection scope of the present application.

Claims

1. A battery, characterized by, The battery comprises a shell (9), a winding core (10), a top cover plate (1), a pressure piston device (2), a positive pole (3), a negative pole (4), a positive side wire (5) and a negative side wire (6); wherein, The winding core (10) is arranged in the shell (9), the top cover plate (1) closes the shell (9), the top cover plate (1) is provided with a positive pole hole and a negative pole hole, and has a lower surface facing the winding core (10); The positive pole (3) and the negative pole (4) are arranged in the positive pole hole and the negative pole hole respectively, and are electrically connected with the winding core (10); The pressure piston device (2) is arranged on the lower surface of the top cover plate (1) and is located between the positive pole (3) and the negative pole (4), and can be driven to move under the action of the gas generated in the battery; The positive side wire (5) and the negative side wire (6) are arranged on the lower surface of the top cover plate (1), and one end of each is electrically connected with the positive pole (3) and the negative pole (4) respectively, and the other end of each can be electrically connected with the pressure piston device (2) when the pressure piston device (2) is driven to move, so that the battery forms an internal short circuit.

2. The battery of claim 1, wherein, The pressure piston device (2) comprises a shell (201), a movable piece and a spring sheet (210); The shell (201) is arranged on the lower surface of the top cover plate (1); One end of the shell (201) facing the top cover plate (1) is provided with a connecting port (211), and the positive side wire (5) and the negative side wire (6) extend into the connecting port (211); The other end of the shell (201) away from the top cover plate (1) is provided with a groove (207), and the groove (207) is in communication with the connecting port (211); The spring sheet (210) is arranged in the groove (207) and connected with the bottom wall of the groove (207); The movable piece is arranged in the groove (207) and connected with one end of the spring sheet (210) away from the bottom wall of the groove (207), and the movable piece can be driven to move into the connecting port (211) under the action of the gas generated in the battery, so as to be electrically connected with one end of the positive side wire (5) and the negative side wire (6) extending into the connecting port (211) respectively.

3. The battery of claim 2, wherein, The movable piece comprises a gas bearing sheet (202), a connecting block (203) and a conductive block (204); The gas bearing sheet (202) is connected with the spring sheet (210) and can be driven to move by overcoming the elastic deformation of the spring sheet (210) under the action of the gas generated in the battery; The connecting block (203) is connected between the gas bearing sheet (202) and the conductive block (204), so as to drive the conductive block (204) to move towards the top cover plate (1) when the gas bearing sheet (202) is driven to move; The conductive block (204) is arranged at least partially in the connecting port (211) and is driven to move through the connecting port (211) to electrically connect with the positive electrode side lead wire (5) and the negative electrode side lead wire (6) under the action of the gas generated in the battery.

4. The battery of claim 3, wherein, The pressure piston device (2) further comprises a detent (209); The side wall of the groove (207) is provided with a receiving hole; The detent (209) is arranged in the receiving hole and can be ejected when the gas bearing sheet (202) is driven to move, so as to limit the gas bearing sheet (202) and prevent the gas bearing sheet (202) from being reset under the action of the spring sheet (210).

5. The battery of claim 4, wherein, The pressure piston device (2) further comprises a position fixing block (205); The position fixing block (205) is arranged on the side wall of the groove (207), and the position fixing block (205) is configured to limit the gas bearing sheet (202) when the gas bearing sheet (202) is reset under the action of the spring sheet (210).

6. The battery of claim 3, wherein, The conductive block (204) is a resistance block, and the resistance value of the resistance block is R; R = U max / I max , wherein U max is the maximum voltage of the battery, I max is the maximum allowed current of the battery during operation; The rate of releasing electric energy of the resistance block is 512-3200J.

7. The battery of claim 2, wherein, Two notches (206) are formed in one end of the shell (201) facing the top cover plate (1), and the two notches (206) are arranged at two ends of the connecting port (211) and communicate with the connecting port (211), and the two notches (206) are configured to pass through the positive electrode side lead wire (5) and the negative electrode side lead wire (6) to extend into the connecting port (211).

8. The battery of claim 1, wherein, The positive electrode side lead wire (5) and the negative electrode side lead wire (6) are both nickel filaments, and the cross-sectional length is 0.2-0.5cm and the cross-sectional width is 0.01-0.05cm.

9. The battery of claim 1, wherein, The top cover plate (1) is provided with an explosion-proof hole and a liquid injection hole, the explosion-proof hole is provided with an explosion-proof valve (7), the liquid injection hole is provided with a sealing spike, the pressure piston device (2) is arranged between the positive electrode column (3) and the explosion-proof valve (7), and the sealing spike is arranged between the negative electrode column (4) and the explosion-proof valve (7). The pressure required for driving the pressure piston device (2) to move is less than the upper limit of the pressure of the explosion-proof valve (7) and greater than the maximum pressure of the life cycle of the battery.

10. The battery of claim 3, wherein, The battery further comprises a signal transmission device (8); The top cover plate (1) is provided with a transmission hole corresponding to the connecting port (211); The signal transmission device (8) is arranged on the upper surface of the top cover plate (1) away from the winding core (10), the signal transmission device (8) comprises a transmission member, one end of the transmission member is electrically connected with an external BMS, the other end passes through the transmission hole and can be electrically connected with the conductive block (204) when the conductive block (204) is driven to move with the gas bearing sheet (202), so as to transmit a warning signal to the BMS.

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