CN218602590U - Battery module, battery and consumer - Google Patents

Abstract

The application discloses a battery module, a battery and electric equipment. The battery module includes a plurality of battery cells stacked and electrically connected. The plurality of battery cells includes: a first battery cell, the first battery cell is provided with a self-protection mechanism, and the self-protection mechanism is configured to When the internal pressure of the battery cell reaches the first threshold, cut off the charging and discharging circuit of the first battery cell or make the first battery cell form an external short circuit; the second battery cell, the second battery cell is not provided with a self-protection mechanism; Wherein, along the stacking direction, at least two battery cells at both ends of the plurality of battery cells are the second battery cells. The technical solution provided by the application can reduce the cost of the battery under the condition of ensuring the safety of the battery.

Description

Battery modules, batteries and electrical equipment

technical field

The present application relates to the field of battery technology, in particular, to a battery module, battery and electrical equipment.

Background technique

Energy conservation and emission reduction is the key to the sustainable development of the automobile industry, and electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

In the development of battery technology, how to reduce the cost of the battery under the condition of ensuring the safety of the battery is a technical problem that needs to be solved urgently.

Utility model content

The present application provides a battery module, a battery and electric equipment, which can reduce the cost of the battery under the condition of ensuring the safety of the battery.

The application is achieved through the following technical solutions:

In a first aspect, the present application provides a battery module, including a plurality of battery cells stacked and electrically connected, and the plurality of battery cells include: a first battery cell, the first battery cell is arranged There is a self-protection mechanism, and the self-protection mechanism is configured to cut off the charging and discharging circuit of the first battery unit or make the first battery unit The body forms an external short circuit; the second battery cell, the second battery cell is not provided with the self-protection mechanism; wherein, along the stacking direction, at least two battery cells at both ends of the plurality of battery cells are is the second battery cell.

In the above solution, a plurality of battery cells in the battery module are stacked, and at least two battery cells at both ends are the second battery cells without a self-protection mechanism, and the first battery cell with a self-protection mechanism Both sides of the body are stacked with battery cells. On the one hand, because the battery cells at both ends dissipate heat quickly, it is not necessary to set up a self-protection mechanism to reduce the cost of the battery; on the other hand, for both sides of the battery stacked For the first battery cell of the single battery cell, due to the influence of the adjacent battery cells, its heat dissipation is slow, so the internal pressure increases faster and can reach the first threshold faster. Therefore, in the first battery cell There are battery cells on both sides, which can make the first battery cell trigger the self-protection mechanism in time to cut off its own charging and discharging circuit to cut off the charging and discharging circuit of the entire battery module, or make the first battery cell form a External short circuit (the voltage will drop significantly at this time, and the voltage drop can be used as an early warning signal) to provide an early warning signal to the battery management system (BMS) to limit the charging and discharging work of the battery module through the battery management system, thereby reducing the battery life. The risk of thermal runaway ensures the safety of the battery.

According to some embodiments of the present application, the first battery cell is further provided with a pressure relief mechanism configured to be activated to release pressure when the internal pressure of the first battery cell reaches a second threshold. lowering the internal pressure, the first threshold is less than the second threshold.

In the above solution, the first battery cell is provided with a pressure relief mechanism, and the pressure relief mechanism is activated when the internal pressure of the first battery cell reaches the second threshold, so as to release the pressure in the first battery cell and reduce the battery life. The risk of explosion, but when the pressure relief mechanism brakes, the high-temperature and high-pressure fluid in the first battery cell will be discharged, causing damage to other components of the battery, resulting in failure of the battery seal and insulation. Since the first threshold is smaller than the second threshold, when the internal pressure of the first battery cell rises, the self-protection mechanism can work ahead of the pressure relief mechanism, so as to cut off the charging and discharging circuit of the first battery cell in time or make the first battery cell The battery cell forms an external short circuit, thereby limiting the charging and discharging work of the first battery cell, limiting the further increase of the internal pressure of the first battery cell, reducing the probability of actuating the pressure relief mechanism, and ensuring the safety of the battery.

According to some embodiments of the present application, the difference between the second threshold and the first threshold is ΔP, which satisfies: 0.05Mpa≤ΔP≤0.8Mpa.

In the above solution, the second threshold is greater than the first threshold, and if the difference ΔP between the second threshold and the first threshold is greater than 0.8Mpa, the self-protection mechanism will be triggered more easily, but in fact the first battery cell does not When the charge and discharge limit is reached, the charge and discharge performance of the first battery cell cannot be effectively utilized, resulting in waste; if the difference ΔP between the second threshold and the first threshold is less than 0.05Mpa, the self-protection mechanism will release the pressure when it is triggered. The mechanism is also easy to actuate and cannot reduce the probability of actuating the pressure relief mechanism; therefore, in this solution, the difference between the second threshold and the first threshold is ΔP to satisfy: 0.05Mpa≤ΔP≤0.8Mpa, with The self-protection mechanism can effectively limit the further increase of the internal pressure of the first battery cell, and make the first battery cell have higher charge and discharge performance.

According to some embodiments of the present application, the first battery cell includes a housing, and both the self-protection mechanism and the pressure relief mechanism are disposed on a first wall of the housing.

In the above solution, both the self-protection mechanism and the pressure relief mechanism are arranged on the first wall, which can ensure the energy density of the first battery cell without affecting the space inside the first battery cell.

According to some embodiments of the present application, the housing includes a housing and an end cover, the housing has an opening, the end cover covers the opening, and the first wall is the end cover.

In the above scheme, in the process of producing the first battery cell, the shell and the end cover are supplied separately, and the self-protection mechanism and the pressure relief mechanism are integrated in the end cover, which can effectively improve the assembly efficiency of the first battery cell. Thereby improving the production efficiency of the battery.

According to some embodiments of the present application, among the plurality of battery cells, the number of the first battery cell is one, and the rest of the battery cells are all the second battery cells.

In the above solution, multiple battery cells in the battery module are electrically connected to each other. If the self-protection mechanism of the first battery cell works, the remaining battery cells can be restricted from charging and discharging accordingly. Therefore, a first battery cell can be provided. The battery cells, and the remaining battery cells can be the second battery cells, so as to reduce the cost of the battery as much as possible under the condition of ensuring the safety of the battery.

According to some embodiments of the present application, the number of the second battery cells is 2n, and n is an integer ≥ 1; along the stacking direction, the second batteries on both sides of the first battery cell The number of monomers is n respectively.

In the above solution, when the number of second battery cells is an even number, the same number of second battery cells are stacked on both sides of the first battery cell, that is, the first battery cell is located in the center of the battery module , so the heat dissipation of the first battery cell at this position is the slowest, and the internal pressure increases the fastest, so the self-protection mechanism of the first battery cell at this position can be triggered in time to effectively reduce the thermal runaway and thermal spread of the battery risk, to ensure the safety of the battery.

According to some embodiments of the present application, the number of the second battery cells is 2n+1, and n is an integer ≥ 1; along the stacking direction, the second battery cells on one side of the first battery cells The number of the second battery cells is n, and the number of the second battery cells on the other side of the first battery cell is n+1.

In the above solution, when the number of second battery cells is 2n+1, n second battery cells are stacked on one side of the first battery cell, and n+1 second battery cells are stacked on the other side, In order to make the heat dissipation of the first battery cell slower than that of the battery cells at the end, the internal pressure increases faster, ensuring that the self-protection mechanism can be triggered in time, so as to effectively reduce the risk of battery thermal runaway and thermal spread, and ensure that the battery security.

According to some embodiments of the present application, the first battery cell has a first electrode terminal and an electrode assembly, and the first electrode terminal is electrically connected to the first tab of the electrode assembly through a self-protection mechanism; The protection mechanism includes a flipping sheet and a conductive sheet connected to each other, the flipping sheet is connected to the first electrode terminal, the first tab is connected to the flipping sheet through the conductive sheet, and the flipping sheet is configured as When the internal pressure of the first battery cell reaches the first threshold, the flipping is used to break the conductive sheet, thereby disconnecting the electrical connection with the first tab.

In the above solution, when the first battery cell is overcharged (overcharged) or internal gas is produced due to an accidental internal short circuit and the pressure increases to the first threshold, the internal pressure of the first battery cell will act on the flip plate and Turning the reversing piece over to pull off the conductive piece, and then cutting off the electrical connection between the first tab and the first electrode terminal, so as to realize the cutting off of the charging and discharging circuit of the first battery cell, limit the continuous charging and discharging of the first battery cell, and reduce the Risk of battery thermal runaway and heat spread.

According to some embodiments of the present application, the first battery cell has a casing, a first electrode terminal, a second electrode terminal, and an electrode assembly; the first electrode terminal and the second electrode terminal are respectively disposed on the casing The first wall of the first wall, the electrode assembly is arranged in the shell, the first electrode terminal is electrically connected to the first wall, and the second electrode terminal is insulated and connected to the first wall; the self-protection The mechanism includes an overturning piece, the overturning piece is electrically connected with the first wall, and the overturning piece is configured to overturn when the internal pressure of the first battery cell reaches the first threshold, so that the first battery cell The second electrode terminal is electrically connected to the first electrode terminal.

In the above solution, when the first battery cell is overcharged (overcharged) or internal gas is produced due to an accidental internal short circuit and the pressure increases to the first threshold, the internal pressure of the first battery cell will act on the flip plate and The reversing plate is turned over to conduct the first electrode terminal and the second electrode terminal, so that the first battery cell forms an external short circuit, restricts the first battery cell from continuing to charge and discharge, and reduces the risk of battery thermal runaway and heat spread.

In the second aspect, the present application also provides a battery, including a box and a first battery module set in the box, the first battery module is the battery module according to any one of the first aspect. Group.

In the above solution, since the battery has the battery module provided in the first aspect, the battery has a reduced manufacturing cost under the condition of ensuring safety.

According to some embodiments of the present application, the battery further includes a second battery module set in the box, and none of the plurality of battery cells in the second battery module is provided with the self-protection mechanism The first battery module and the second battery module are stacked on each other, and along the stacking direction, the first battery module is located between the two second battery modules.

In the above solution, in order to control the cost in the battery, the battery cells in the second battery module may not be provided with a self-protection mechanism. At the same time, since the first battery module is located between the two second battery modules, the The heat dissipation of the first battery module is poor, and it is easy to generate a beehive of thermal runaway, so the first battery cell in the first battery module can be equipped with a self-protection mechanism to trigger the self-protection mechanism in time to ensure the safety of the battery .

In a third aspect, the present application further provides an electric device, including the battery provided in the second aspect, where the battery is used to provide electric energy.

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, so It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

What Fig. 1 shows is the simplified schematic diagram of the vehicle in some embodiments of the present application;

Fig. 2 shows a schematic structural view of the battery of the vehicle in Fig. 1;

Fig. 3 is a top view of a battery module in some embodiments of the present application;

Fig. 4 is the sectional view of A-A direction in Fig. 3;

Fig. 5 is the enlarged view of place B in Fig. 4;

Fig. 6 is a top view of a battery module in another embodiment of the present application;

Fig. 7 is a sectional view of C-C direction in Fig. 6;

FIG. 8 is an enlarged view at point D in FIG. 7 .

Icons: 10-battery module; 11-first battery cell; 12-second battery cell; 13-self-protection mechanism; 14-pressure relief mechanism; 110-shell; 111-end cover; 112-first electrode Terminal; 113-electrode assembly; 114-second electrode terminal; 130-reverse sheet; 131-conductive sheet; x-stacking direction; 1000-vehicle; 100-battery; 200-controller; 300-motor; 20-box ; 21 - the first box; 22 - the second box.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are the Claim some of the examples, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field of this application; the terms used in this application in the description of the application are only to describe specific implementations The purpose of the example is not intended to limit the present application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and the description of the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific sequence or primary-subordinate relationship. Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection", "connection" and "attachment" should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

The term "and/or" in this application is just an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which can mean: there is A, A and B exist at the same time, and B exists These three situations. In addition, the character "/" in this application generally indicates that the contextual objects are an "or" relationship.

"Multiple" appearing in this application refers to more than two (including two)

In the present application, the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application. The battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application. Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module, and the battery module includes a plurality of battery cells stacked and electrically connected. A battery generally includes a case for enclosing one or more battery modules. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.

The battery cell includes a casing, an end cover, an electrode terminal, an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell works primarily by moving metal ions between the positive and negative plates. The material of the diaphragm can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, which is not limited in the embodiment of the present application. The electrode assembly and the electrolyte are sealed in the opening of the casing by the end cap, and the electrode terminals are arranged on the end cap and electrically connected with the tabs of the electrode assembly for outputting or inputting electric energy of the battery cells.

The development of battery technology should consider many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the safety of the battery also needs to be considered. For battery cells, the main safety hazard comes from the charging and discharging process, and there is also a suitable ambient temperature design. In order to effectively avoid unnecessary losses and reduce the risk of thermal runaway (the reason for thermal runaway is that the heating rate is greatly Due to the heat dissipation rate), the battery cells are generally provided with a self-protection mechanism and/or a pressure relief mechanism.

The self-protection mechanism means that when the internal pressure of the battery cell reaches a predetermined threshold (the first threshold), the self-protection mechanism is triggered to cut off the charging and discharging circuit of the battery cell or make the battery cell form an external short circuit to prevent the battery cell from being discharged. The element or component that continues to charge and discharge the body, thereby controlling the heat generation rate of the battery. The first threshold may depend on the materials of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte and the separator in the battery cell. "The self-protection mechanism is triggered" means that the self-protection mechanism operates to disconnect the charging and discharging circuit of the battery cell or a short circuit occurs outside the battery cell. Actions produced by the self-protection mechanism may include, but are not limited to: disconnecting the electrical connection between the electrode terminal and the electrode assembly, or conducting the positive electrode terminal and the negative electrode terminal, so that the external short circuit of the battery cell occurs (at this time, the voltage will appear significantly The voltage drop can be sent to the battery management system as an early warning signal), etc. The self-protection mechanism may use an existing CID (Current Interrupt Device, current interruption device) or SSD (Safety Short Device, safety short circuit device).

The pressure relief mechanism refers to an element or part that is activated when the internal pressure of the battery cell reaches a predetermined threshold (second threshold) to release the internal pressure or temperature to prevent the battery cell from exploding. The threshold design varies according to design requirements. The second threshold may depend on the materials of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte and the separator in the battery cell. The pressure relief mechanism can take the form of an explosion-proof valve, gas valve, pressure relief valve or safety valve, etc., and can specifically use a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold When the pressure relief mechanism performs an action or the weak structure provided in the pressure relief mechanism is destroyed, an opening or channel for internal pressure relief is formed. "Actuation" means that the pressure relief mechanism acts or is activated to a certain state, so that the internal pressure of the battery cell can be released. Actions by the pressure relief mechanism may include, but are not limited to, at least a portion of the pressure relief mechanism rupture, shatter, be torn, or open, among others. When the pressure relief mechanism is actuated, the high-temperature and high-pressure material inside the battery cell will be discharged from the actuated part as discharge. In this way, the pressure and temperature of the battery cells can be released under the condition of controllable pressure or temperature, so as to avoid potential more serious accidents. The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrodes, fragments of separator, high-temperature and high-pressure gas generated by reaction, flame, high-temperature and high-pressure gas liquid (electrolyte) and so on.

In the development of battery technology, how to ensure the safety of batteries under the condition of reducing battery manufacturing costs is a technical problem that needs to be solved urgently in battery technology. The inventors found that currently, in order to pursue high safety of the battery, each battery cell in the battery module is equipped with a self-protection mechanism, but the cost of the self-protection mechanism is high, so the cost of the battery is high. For this reason, the inventor found that in the battery module, the battery cells at both ends of the battery module dissipate heat faster than other battery cells, and the battery cells with battery cells stacked on both sides are clamped Therefore, the heat dissipation is slow, so the self-protection mechanism of the battery cells at both ends of the battery module is difficult to be triggered, or before it is triggered, the self-protection mechanisms of other battery cells have been triggered, resulting in the self-protection of the battery cells at both ends. The protective mechanism does not work, resulting in waste.

In view of this, in order to reduce the cost of the battery under the condition of ensuring the safety of the battery, the inventor designed a battery module after in-depth research. The battery cells in the battery module include a first battery cell and a second battery cell. Two battery cells, the first battery cell is provided with a self-protection mechanism, and the second battery cell is not provided with a self-protection mechanism. Among the plurality of battery cells in the battery module, at least the battery cells at both ends are the second battery cells.

In the above solution, on the one hand, since the battery cells at both ends dissipate heat quickly, it is not necessary to set up a self-protection mechanism to reduce the cost of the battery; on the other hand, in order to ensure the safety of the battery, the The first battery cell that causes slow heat dissipation at both ends is provided with a self-protection mechanism, so that when the self-protection mechanism is triggered, it can cut off the charging and discharging circuit of the entire battery module or provide an early warning signal to the battery management system (BMS). Limit the charging and discharging work of the battery module, thereby reducing the risk of battery thermal runaway and thermal spread, and ensuring the safety of the battery.

The technical solutions described in the embodiments of the present application are applicable to batteries and electric devices using batteries.

It can be understood that the electric devices that use battery cells, battery modules or batteries described in the embodiments of the present application can be in various forms, for example, mobile phones, portable devices, notebook computers, battery cars, electric cars, ships, Spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spaceships, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric Ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, Concrete vibrator and planer.

The battery cells, battery modules or batteries described in the embodiments of the present application are not limited to the above-described electric devices, but also applicable to all electric devices that use battery cells, battery modules, and batteries. For brevity, the following embodiments are all described by taking an electric vehicle as an example.

FIG. 1 shows a simplified schematic diagram of a vehicle in an embodiment of the present application, and FIG. 2 shows a schematic structural diagram of a battery of the vehicle in FIG. 1 .

As shown in FIG. 1 , a battery 100 , a controller 200 and a motor 300 are disposed inside the vehicle 1000 , for example, the battery 100 may be disposed at the bottom, front or rear of the vehicle 1000 . The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle.

In some embodiments of the present application, the battery 100 can be used for power supply of the vehicle 1000 , for example, the battery 100 can be used as an operating power source of the vehicle 1000 . The controller 200 is used to control the power supply of the battery 100 to the motor 300 , for example, for starting, navigating, and working power requirements of the vehicle 1000 during driving. In other embodiments, the battery 100 can not only be used as an operating power source for the vehicle 1000 , but can also be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle 1000 .

As shown in FIG. 2 , the battery 100 includes a plurality of battery modules 10 and a case 20 , and the plurality of battery modules 10 are placed in the case 20 . The box body 20 includes a first box body 21 and a second box body 22. The first box body 21 and the second box body 22 are closed to form a battery cavity, and a plurality of battery 100 modules are placed in the battery cavity. Wherein, the shapes of the first box body 21 and the second box body 22 may be determined according to the combined shape of a plurality of battery modules 10 , and each of the first box body 21 and the second box body 22 may have an opening. For example, both the first box body 21 and the second box body 22 can be hollow cuboids and only one face is an opening face, the openings of the first box body 21 and the second box body 22 are arranged oppositely, and the first box body 21 and the second box body 22 are arranged oppositely. The second boxes 22 are interlocked to form the box 20 with a closed chamber. A plurality of battery modules 10 are connected in parallel, in series or mixed, and stacked, and placed in the box 20 formed by fastening the first box 21 and the second box 22 .

According to some embodiments of the present application, please refer to FIG. 3-FIG. 7, FIG. 3 is a top view of the battery module 10 in some embodiments of the present application, FIG. 4 is a cross-sectional view of A-A in FIG. 3 , and FIG. 5 is a B in FIG. 4 Enlarged view of .

The battery module 10 includes a plurality of battery cells stacked and electrically connected. The plurality of battery cells includes a first battery cell 11 and a second battery cell 12 . The first battery cell 11 is provided with a self-protection mechanism 13, and the self-protection mechanism 13 is configured to cut off the charging and discharging circuit of the first battery cell 11 or make the second A battery cell 11 forms an external short circuit. The second battery cell 12 is not provided with a self-protection mechanism 13 .

Wherein, along the stacking direction x, among the plurality of battery cells, at least two battery cells located at both ends are the second battery cells 12 .

Referring to FIG. 3 , along the stacking direction x, the battery module 10 is provided with a plurality of battery cells, and the battery cells are stacked. In some embodiments, multiple battery cells of the battery module 10 may be connected in series.

The first battery cell 11 may refer to a battery cell provided with a self-protection mechanism 13 . The self-protection mechanism 13 can be used to prevent the thermal runaway of the battery cell due to overcharging (meaning that the battery cell continues to charge after reaching a full state during charging) or internal pressure or temperature sudden rise due to an internal short circuit.

The second battery cell 12 may refer to a battery cell that is not provided with the self-protection mechanism 13 . Since the second battery cell 12 is not provided with the self-protection mechanism 13 , its cost may be lower than that of the first battery cell 11 .

"Along the stacking direction x, at least two battery cells located at both ends of the multiple battery cells are the second battery cells 12" may refer to, among the multiple battery cells of the battery module 10, the The battery cells at the two opposite ends of the group 10 are the second battery cells 12, and the battery cells at other positions of the battery module 10 must include a first battery cell 11 (that is, two cells of the first battery cell 11 A battery cell is provided on each side, and the battery cell can be the first battery cell 11 or the second battery cell 12). In some embodiments, the second battery cell 12 can be arranged at other positions of the battery module 10 besides being arranged at the end of the battery module 10 .

In the above solution, on the one hand, due to the high cost of the self-protection mechanism 13, in order to reduce the cost of the battery, the second battery cell 12 in the battery module 10 is not provided with a self-protection mechanism 13; on the other hand, for both sides For the first battery cell 11 stacked with battery cells, due to the influence of adjacent battery cells, its heat dissipation is slower, so the internal pressure increases faster than the second battery cell 12 at the end of the battery module 10 , can reach the first threshold faster, therefore, the battery cells are arranged on both sides of the first battery cell 11, which can make the first battery cell 11 trigger the self-protection mechanism in time, that is, the first battery cell 11 Cut off its own charging and discharging circuit to cut off the charging and discharging circuit of the entire battery module 10, or the first battery cell 11 forms an external short circuit (the voltage will drop significantly at this time, and the voltage drop can be used as an early warning signal) to The battery management system (BMS) provides an early warning signal, and then restricts the charging and discharging work of the battery module 10 through the battery management system, thereby reducing the risk of battery thermal runaway and heat spread, and ensuring the safety of the battery.

According to some embodiments of the present application, the first battery cell 11 is further provided with a pressure relief mechanism 14 configured to be activated to release the internal pressure when the internal pressure of the first battery cell 11 reaches a second threshold. pressure, the first threshold is less than the second threshold.

As shown in FIG. 3 , the first battery cell 11 is provided with a pressure relief mechanism 14 , which is an element or component capable of releasing the internal pressure of the battery cell to prevent the battery cell from exploding. In some embodiments, the second battery cell 12 may also be provided with a pressure relief mechanism 14 .

The second threshold is greater than the first threshold, which means that when the internal pressure of the first battery cell 11 suddenly rises due to overcharging or internal short circuit, the self-protection mechanism 13 works before the pressure relief mechanism 14 . Since the self-protection mechanism 13 works before the pressure relief mechanism 14, the probability of the internal pressure of the battery cell continuing to rise can be reduced, and the probability of the pressure relief mechanism 14 being actuated can be reduced.

In the above solution, the first battery cell 11 is provided with a pressure relief mechanism 14, and the pressure relief mechanism 14 is activated when the internal pressure of the first battery cell 11 reaches the second threshold to release the first battery cell 11 The internal pressure reduces the risk of battery explosion, but when the pressure relief mechanism 14 brakes, the high-temperature and high-pressure fluid (such as gas and electrolyte) in the first battery cell 11 will be discharged, causing damage to other components of the battery. Cause the problem of battery seal insulation failure. Since the first threshold is smaller than the second threshold, when the internal pressure of the first battery cell 11 rises, the self-protection mechanism 13 can work before the pressure relief mechanism 14, so as to cut off the charging and discharging circuit of the first battery cell 11 in time Or make the first battery cell 11 form an external short circuit, and then limit the charging and discharging work of the first battery cell 11, limit the internal pressure of the first battery cell 11 to continue to rise, reduce the probability of actuating the pressure relief mechanism 14, and ensure Battery safety.

According to some embodiments of the present application, the difference between the second threshold and the first threshold is ΔP, which satisfies: 0.05Mpa≤ΔP≤0.8Mpa.

The second threshold is M1, the first threshold is M2, and the difference between the second threshold and the first threshold ΔP=M1-M2. The difference ΔP between the second threshold and the first threshold cannot be too large, for example, if ΔP is greater than 0.8Mpa, if it is too large, the charging and discharging performance of the first battery cell 11 will be limited, and the difference ΔP between the second threshold and the first threshold will also be It cannot be too small, such as ΔP is less than 0.05MPa, if it is too small, the probability of braking by the pressure relief mechanism 14 cannot be effectively reduced, and even cause the self-protection mechanism 13 and the pressure relief mechanism 14 to work at the same time, and the function of the self-protection mechanism 13 cannot be exerted.

In the above solution, the second threshold is greater than the first threshold, and if the difference ΔP between the second threshold and the first threshold is greater than 0.8Mpa, the self-protection mechanism 13 will be triggered more easily, but in fact the first battery cell 11 If the charging and discharging limit is not reached, the charging and discharging performance of the first battery cell 11 cannot be effectively exerted, resulting in waste; if the difference ΔP between the second threshold and the first threshold is less than 0.05Mpa, the self-protection mechanism 13 is triggered , the pressure relief mechanism 14 is also easy to actuate, which cannot reduce the probability of actuation of the pressure relief mechanism 14; therefore, in this solution, the difference between the second threshold and the first threshold is ΔP satisfying: 0.05Mpa≤ΔP≤ 0.8Mpa, so that the self-protection mechanism 13 can effectively limit the further increase of the internal pressure of the first battery cell 11, and make the first battery cell 11 have a higher charge and discharge performance.

According to some embodiments of the present application, with reference to FIG. 3 , FIG. 4 and FIG. 5 , the first battery cell 11 includes a casing 110 , and the self-protection mechanism 13 and the pressure relief mechanism 14 are both disposed on the first wall of the casing 110 .

In some embodiments, the housing 110 may include a housing and an end cap 111, and the housing 110 may accommodate the electrode assembly 113 and the electrolyte. The end cap 111 may cover the opening of the housing. In some embodiments, the first wall may refer to the end cover 111; in other embodiments, the first wall may refer to the wall of the casing.

“Both the self-protection mechanism 13 and the pressure relief mechanism 14 are disposed on the first wall of the housing 110 ” may mean that the self-protection mechanism 13 and the pressure relief mechanism 14 are disposed on the same wall of the housing 110 .

In the above solution, both the self-protection mechanism 13 and the pressure relief mechanism 14 are arranged on the first wall, which can ensure the energy density of the first battery cell 11 without affecting the space inside the first battery cell 11 .

According to some embodiments of the present application, the housing 110 includes a housing and an end cover 111 , the housing has an opening, the end cover 111 covers the opening, and the first wall is the end cover 111 .

In the above scheme, in the process of producing the first battery cell 11, the housing and the end cover 111 are supplied separately, and the self-protection mechanism 13 and the pressure relief mechanism 14 are integrated into the end cover 111, which can effectively improve the performance of the first battery cell. The assembly efficiency of the body 11 is improved, thereby improving the production efficiency of the battery.

According to some embodiments of the present application, among the plurality of battery cells, there is only one first battery cell 11 , and the rest of the battery cells are all second battery cells 12 .

In some embodiments, the battery module 10 is provided with only one first battery cell 11 , and the rest of the battery cells in the battery module 10 are second battery cells 12 that are not provided with a self-protection mechanism 13 and have a lower cost. As shown in FIG. 3 , the battery module 10 has 12 battery cells, and the 12 battery cells include 1 first battery cell 11 and 11 second battery cells 12 .

In the above solution, multiple battery cells in the battery module 10 are electrically connected to each other. If the self-protection mechanism 13 of the first battery cell 11 works, the remaining battery cells can be restricted from charging and discharging accordingly (if the first battery cell If the self-protection mechanism 13 cuts off the charge-discharge circuit of the cell 11, it can cut off the charge-discharge circuit of the entire battery module 10, or the first battery cell 11 forms an external short circuit due to the self-protection mechanism 13, and the voltage will appear significantly at this time. The voltage drop can be sent to the battery management system (BMS) as an early warning signal, and then the charging and discharging work of the battery module 10 is limited by the battery management system), so a first battery cell 11 can be set, and the remaining batteries All the cells can be the second battery cells 12, so as to reduce the cost of the battery as much as possible under the condition of ensuring the safety of the battery.

In some other embodiments, in the battery module 10, the number of the first battery cells 11 may also be multiple, that is, 2, 3 or 4, and so on.

According to other embodiments of the present application, please refer to FIG. 6 , which is a top view of a battery module 10 in other embodiments of the present application. The number of second battery cells 12 is 2n, where n is an integer ≥ 1; along the stacking direction x, the number of second battery cells 12 on both sides of the first battery cell 11 is n respectively.

In the battery module 10 , there are 2n second battery cells 12 , that is, an even number of second battery cells 12 , such as 2, 4, 6 or 8 second battery cells 12 .

"Along the stacking direction x, the number of second battery cells 12 on both sides of the first battery cell 11 is n respectively" may mean that the first battery cell 11 is in the middle of the battery module 10, and its two sides The number of stacked second battery cells 12 is the same.

In the above solution, when the number of second battery cells 12 is an even number, the same number of second battery cells 12 are stacked on both sides of the first battery cell 11, that is, the first battery cells 11 are in the battery mode. The central position of the group 10, so the first battery cell 11 at this position has the slowest heat dissipation and the fastest internal pressure increase, so the self-protection mechanism 13 of the first battery cell 11 at this position can be triggered in time to effectively Reduce the risk of battery thermal runaway and heat spread, and ensure battery safety.

According to some embodiments of the present application, please refer to FIG. 3 , the number of second battery cells 12 is 2n+1, n is an integer ≥ 1; along the stacking direction x, the first battery cell 11 on one side The number of the second battery cells 12 is n, and the number of the second battery cells 12 on the other side of the first battery cell 11 is n+1.

In the battery module 10, there are 2n+1 second battery cells 12, that is, an odd number of second battery cells 12 greater than 1, for example, 3, 5, 7 or 9 etc. Two battery cells 12 .

"Along the stacking direction x, the number of second battery cells 12 on one side of the first battery cell 11 is n, and the number of second battery cells 12 on the other side of the first battery cell 11 is n+ 1", may mean that the first battery cell 11 and one adjacent second battery cell 12 are in the middle of the battery module 10, and the first battery cell 11 and one adjacent second battery cell 12 The number of second battery cells 12 stacked on both sides is the same.

In the above solution, when the number of second battery cells 12 is 2n+1, n second battery cells 12 are stacked on one side of the first battery cell 11, and n+1 second batteries are stacked on the other side. Cell 12, so that the heat dissipation of the first battery cell 11 is slower than that of the battery cells at the end, and the internal pressure increases quickly, so as to ensure that the self-protection mechanism 13 can be triggered in time to effectively reduce battery thermal runaway and heat loss. The risk of contagion ensures the safety of the battery.

According to some embodiments of the present application, please refer to FIG. 5 , the first battery cell 11 has a first electrode terminal 112 and an electrode assembly 113 , the first electrode terminal 112 is electrically connected to the first tab of the electrode assembly 113 through the self-protection mechanism 13 . Connection; the self-protection mechanism 13 includes an interconnected flip sheet 130 and a conductive sheet 131, the flip sheet 130 is connected to the first electrode terminal 112, the first tab and the flip sheet 130 are connected through the conductive sheet 131, and the flip sheet 130 is configured to When the internal pressure of the first battery cell 11 reaches the first threshold, it turns over, so as to break the conductive sheet 131 , thereby disconnecting the electrical connection with the first tab.

In some embodiments, the first electrode terminal 112 may be a pole provided on the end cover 111 , and the pole is electrically connected to the first tab of the electrode assembly 113 through the self-protection mechanism 13 .

In some embodiments, in a normal state, that is, when the internal pressure of the first battery cell 11 does not reach the first threshold, the first electrode terminal 112 is electrically connected to the first tab through the flip plate 130 and the conductive member. When the internal pressure of the first battery cell 11 reaches the first threshold, the turning piece 130 will turn over in time towards the first electrode terminal 112 due to the pressure, so that the conductive piece 131 can be pulled off, and then the first electrode terminal 112 and the electrode will be disconnected. The electrical connection between the components 113 realizes the disconnection of the charging and discharging circuit of the first battery cell 11 . Those skilled in the art often refer to the self-protection mechanism 13 that cuts off the charge-discharge circuit of the first battery cell 11 by turning over the turning piece 130 as a current cut-off device, namely a CID.

In some embodiments, the turning piece 130 can be made of aluminum alloy. In some embodiments, the conductive sheet 131 can be made of a conductive material with low strength, which can be broken when the flipping sheet 130 is reversed under pressure. In some embodiments, the connection position between the flipping sheet 130 and the conductive sheet 131 can be weakened to reduce the strength of the connection point so that the flipping sheet 130 can be broken when the flipping sheet 130 is turned over.

In the above solution, when the first battery cell 11 is overcharged) or due to an accidental internal short circuit, internal gas is generated and the pressure increases to the first threshold, the internal pressure of the first battery cell 11 will act on the flipping plate 130 and Make the reversing piece 130 turn over to pull off the conductive piece 131, cut off the electrical connection between the first tab and the first electrode terminal 112, realize the cutting off of the charging and discharging circuit of the first battery cell 11, and limit the first battery cell 11 to continue Charge and discharge, reduce the risk of battery thermal runaway and heat spread, and ensure the safety of the battery.

According to some embodiments of the present application, please refer to FIG. 7 and FIG. 8 , FIG. 7 is a cross-sectional view along C-C in FIG. 6 , and FIG. 8 is an enlarged view at D in FIG. 7 .

The first battery cell 11 has a housing 110, a first electrode terminal 112, a second electrode terminal 114 and an electrode assembly 113; the first electrode terminal 112 and the second electrode terminal 114 are respectively arranged on the first wall of the housing 110, and the electrode assembly 113 Set in the housing 110, the first electrode terminal 112 is electrically connected to the first wall, and the second electrode terminal 114 is insulated and connected to the first wall; the self-protection mechanism 13 includes a flipping piece 130, and the flipping piece 130 is electrically connected to the first wall. The sheet 130 is configured to invert when the internal pressure of the first battery cell 11 reaches a first threshold to electrically connect the second electrode terminal and the first electrode terminal 112 .

In some embodiments, the first wall may be an end cap 111 .

The first electrode terminal 112 and the second electrode terminal are two electrode terminals whose polarities are opposite to each other. For example, when the first electrode terminal 112 is a positive electrode terminal for electrical connection with the positive electrode tab, the second electrode terminal can be Negative electrode terminal for electrical connection with the negative pole lug. The first electrode terminal 112 and the second electrode terminal are located on the first wall of the housing 110 , for example, the first electrode terminal 112 and the second electrode terminal are located on the end cover 111 of the housing 110 .

In some embodiments, the first electrode terminal 112 may be disposed on the first wall by riveting or welding, so that the first electrode terminal 112 is electrically connected to the first wall. The second electrode terminal 114 may be insulated from the first wall through insulating glue.

In some embodiments, the turning piece 130 can be electrically connected to the first wall by welding,

In a normal state, that is, when the internal pressure of the first battery cell 11 does not reach the first threshold, there is a gap between the turning piece 130 and the second electrode terminal 114 . When the internal pressure of the first battery cell 11 reaches the first threshold, the turning piece 130 will turn over towards the first wall in time due to the pressure to be able to contact the second electrode terminal 114, so that the second electrode terminal 114 and the first electrode The terminals 112 are electrically connected to realize an external short circuit of the first battery cell 11 . Those skilled in the art often refer to the self-protection mechanism 13 that conducts two electrode terminals with opposite polarities to realize an external short circuit through the inversion of the inverting plate 130 as a safety short circuit device, namely SSD.

In some other embodiments, the self-protection mechanism 13 further includes a fuse, and the flip piece 130 may be electrically connected to the first electrode terminal 112, and electrically connected to the first tab through the fuse. In a normal state, that is, when the internal pressure of the first battery cell 11 does not reach the first threshold, there is a gap between the turnover piece 130 and the second electrode terminal. When the internal pressure of the first battery cell 11 reaches the first threshold, the turning piece 130 will turn over towards the first wall in time due to the pressure to be able to contact the second electrode terminal, thereby making the second electrode terminal and the first electrode terminal 112 The electrical connection realizes the external short circuit of the first battery cell 11 , and because the current passing through the fuse part is too large due to the external short circuit, the fuse part is blown to realize the cutting off of the charging circuit.

In the above solution, when the first battery cell 11 is overcharged (overcharged) or internal gas is produced due to an accidental internal short circuit and the pressure increases to the first threshold, the internal pressure of the first battery cell 11 will act on the overturn sheet 130 and make the reversing sheet 130 turn over to conduct the first electrode terminal 112 and the second electrode terminal, so that the first battery cell 11 forms an external short circuit, restricting the first battery cell 11 from continuing to charge and discharge, and reducing battery heat. Risk of loss of control and heat spread. At the same time, for the battery, because the first battery cell 11 forms an external short circuit, the voltage at this position drops to 0 instantly, which can provide an early warning signal to the battery management system (BMS). Based on this signal, the battery management system ( BMS) formulate corresponding strategies, such as cutting off the charging and discharging circuit of the entire battery.

According to some embodiments of the present application, the present application also provides a battery, including a box and a first battery module 10 disposed in the box, the first battery module 10 being the battery module 10 described above.

In the above solution, since the battery has the battery module 10 provided in the first aspect, the battery has a reduced manufacturing cost under the condition of ensuring safety.

According to some embodiments of the present application, the battery further includes a second battery module 10 disposed in the case, and the plurality of battery cells in the second battery module 10 are not provided with a self-protection mechanism 13; the first battery module 10 The first battery module 10 is stacked with the second battery modules 10 , and the first battery module 10 is located between the two second battery modules 10 along the stacking direction.

In the above solution, in order to control the cost in the battery, each battery cell in the second battery module 10 may not be provided with a self-protection mechanism 13, and at the same time, since the first battery module 10 is located between two second battery modules 10, so the heat dissipation of the first battery module 10 is relatively poor, and it is easier to generate a beehive of thermal runaway, so the first battery cell 11 in the first battery module 10 can be provided with a self-protection mechanism 13, and timely Trigger the self-protection mechanism to ensure the safety of the battery.

According to some embodiments of the present application, the present application further provides an electric device, including the battery provided in the second aspect, where the battery is used to provide electric energy.

According to some embodiments of the present application, please refer to FIGS. 3-5 , the battery module 10 includes a plurality of battery cells arranged in layers, and the plurality of battery cells are connected in series. The plurality of battery cells includes a first battery cell 11 and a second battery cell 12 . The first battery cell 11 is a battery cell with an end cap 111 provided with a self-protection mechanism 13 , and the self-protection mechanism 13 may be a CID (Current Interrupt Device). The second battery cell 12 is not provided with a self-protection mechanism 13, so the cost is relatively low.

The self-protection mechanism 13 includes a turning piece 130 and a conductive piece 131 , and the positive pole of the first battery cell 11 is connected to the positive pole lug through the turning piece 130 and the conductive piece 131 . When the internal pressure of the first battery cell 11 reaches the first threshold, the reversing sheet 130 is turned over under the pressure and the conductive sheet 131 is torn off to cut off the positive electrode circuit of the first battery cell 11 , that is, the first battery cell 11 is cut off. The charging and discharging circuit can protect against thermal runaway, and can also prevent the battery module 10 from being overcharged.

In the battery module 10, the battery cells at the central position have poorer heat dissipation than the battery cells at the end, and the gas production will be more serious. Therefore, the first battery cell 11 is arranged in the center of the battery module 10 The position is favorable for the first battery cell 11 containing the self-protection mechanism 13 to trigger the self-protection mechanism 13 in time to protect the battery cell and the battery module 10 . When there is one first battery cell 11, in one embodiment, the number of second battery cells 12 is 2n, n is an integer ≥ 1, along the stacking direction x, the number of first battery cells 11 The number of the second battery cells 12 on both sides is n respectively. In another embodiment, the number of the second battery cells 12 is 2n+1, and n is an integer ≥ 1; along the stacking direction x, the second battery cells 12 on one side of the first battery cells 11 The number of battery cells 12 is n, and the number of second battery cells 12 on the other side of the first battery cell 11 is n+1.

According to some embodiments of the present application, referring to FIGS. 6-8 , the battery module 10 includes a plurality of battery cells stacked in series, and the plurality of battery cells are connected in series. The plurality of battery cells includes a first battery cell 11 and a second battery cell 12 . The first battery cell 11 is a battery cell with an end cap 111 provided with a self-protection mechanism 13 , and the self-protection mechanism 13 may be an SSD (safety short circuit device). The second battery cell 12 is not provided with a self-protection mechanism 13, so the cost is relatively low.

The self-protection mechanism 13 includes a turning piece 130, the positive pole of the first battery cell 11 is electrically connected to the end cover 111, the negative pole is insulated and connected to the end cover 111, and the turning piece 130 is welded to the end cover 111 and connected to the negative pole. There is a gap in between. When the internal pressure of the first battery cell 11 reaches the first threshold, the flipper 130 is turned over under pressure to conduct the end cap 111 and the negative pole, so that the positive pole and the negative pole are electrically connected to form the first battery cell 11, and then the first battery cell 11 cannot be charged and discharged. At this time, the voltage of the first battery cell 11 drops to 0 instantly, which can provide an early warning signal to the battery management system (BMS) to A corresponding strategy is formulated to prevent thermal runaway and realize the protection of the battery module 10 from overcharging.

In the battery module 10, the battery cells at the central position have poorer heat dissipation than the battery cells at the end, and the gas production will be more serious. Therefore, the first battery cell 11 is arranged in the center of the battery module 10 The position is favorable for the first battery cell 11 containing the self-protection mechanism 13 to trigger the self-protection mechanism 13 in time to protect the battery cell and the battery module 10 . When there is one first battery cell 11, in one embodiment, the number of second battery cells 12 is 2n, n is an integer ≥ 1, along the stacking direction x, the number of first battery cells 11 The number of the second battery cells 12 on both sides is n respectively. In another embodiment, the number of the second battery cells 12 is 2n+1, and n is an integer ≥ 1; along the stacking direction x, the second battery cells 12 on one side of the first battery cells 11 The number of battery cells 12 is n, and the number of second battery cells 12 on the other side of the first battery cell 11 is n+1.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (13)

1. The utility model provides a battery module, its characterized in that, includes a plurality of battery cells that range upon range of setting and electricity are connected, a plurality of battery cells include:

the self-protection mechanism is configured to cut off a charge-discharge loop of the first battery cell or form an external short circuit when the internal pressure of the first battery cell reaches a first threshold value;

the second battery cell is not provided with the self-protection mechanism;

and at least two of the plurality of battery cells located at two ends are the second battery cell along the stacking direction.

2. The battery module according to claim 1,

the first battery cell is further provided with a pressure relief mechanism configured to actuate to relieve internal pressure of the first battery cell when the internal pressure reaches a second threshold, the first threshold being less than the second threshold.

3. The battery module according to claim 2,

the difference value between the second threshold and the first threshold is delta P, and the following conditions are met: delta P is more than or equal to 0.05Mpa and less than or equal to 0.8Mpa.

4. The battery module according to claim 2,

the first battery cell comprises a shell, and the self-protection mechanism and the pressure relief mechanism are arranged on a first wall of the shell.

5. The battery module according to claim 4,

the housing includes a shell having an opening and an end cap covering the opening, the first wall being the end cap.

6. The battery module according to claim 1,

in the plurality of battery cells, the number of the first battery cell is one, and the rest of the battery cells are the second battery cells.

7. The battery module according to claim 6,

the number of the second battery monomers is 2n, and n is an integer more than or equal to 1;

the number of the second battery cells on both sides of the first battery cell is n, respectively, in the stacking direction.

8. The battery module according to claim 6,

the number of the second battery monomers is 2n +1, and n is an integer more than or equal to 1;

along the stacking direction, the number of the second battery cells on one side of the first battery cell is n, and the number of the second battery cells on the other side of the first battery cell is n + 1.

9. The battery module according to any one of claims 1 to 8,

the first battery cell is provided with a first electrode terminal and an electrode assembly, and the first electrode terminal is electrically connected with a first tab of the electrode assembly through a self-protection mechanism;

the self-protection mechanism comprises an overturning sheet and a conducting sheet which are connected with each other, the overturning sheet is connected with the first electrode terminal, the first tab is connected with the overturning sheet through the conducting sheet, and the overturning sheet is configured to overturn when the internal pressure of the first battery cell reaches the first threshold value so as to break the conducting sheet, so that the conducting sheet is disconnected and the first tab is electrically connected.

10. The battery module according to any one of claims 1 to 8,

the first battery cell has a housing, a first electrode terminal, a second electrode terminal, and an electrode assembly;

the first electrode terminal and the second electrode terminal are respectively disposed on a first wall of the case, the electrode assembly is disposed in the case, the first electrode terminal is electrically connected to the first wall, and the second electrode terminal is connected to the first wall in an insulated manner;

the self-protection mechanism includes an inversion sheet electrically connected to the first wall, the inversion sheet configured to invert when an internal pressure of the first battery cell reaches the first threshold to electrically connect the second electrode terminal and the first electrode terminal.

11. A battery, comprising a box and a first battery module arranged in the box, wherein the first battery module is the battery module according to any one of claims 1-10.

12. The battery according to claim 11,

the battery also comprises a second battery module arranged in the box body, and the plurality of battery monomers in the second battery module are not provided with the self-protection mechanism;

the first battery module and the second battery module are stacked with each other, and the first battery module is located between the two second battery modules along the stacking direction.

13. An electrical consumer, comprising a battery according to claim 11 or 12, for providing electrical energy.

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