WO2024036972A1

WO2024036972A1 - Battery and power system

Info

Publication number: WO2024036972A1
Application number: PCT/CN2023/084015
Authority: WO
Inventors: 杨金星; 张业正; 乐浩南; 侯天宏; 张良钰
Original assignee: 华为数字能源技术有限公司
Priority date: 2022-08-15
Filing date: 2023-03-27
Publication date: 2024-02-22
Also published as: CN115441072A

Abstract

The present application relates to the technical field of energy, and in particular, to a battery and a power system, for use in solving the problem of poor consistency of naked cells. The battery provided by the present application may comprise a housing, a plurality of naked cells, a detection assembly, an equalization assembly, and a battery management unit. The housing is provided with recesses, and the plurality of naked cells are arranged in the recesses and connected in series; the detection assembly is connected to the plurality of naked cells, and is used for monitoring the voltage of each naked cell; the equalization assembly is connected to the plurality of naked cells and can be used for discharging the naked cells; and the battery management unit is connected to the detection assembly and the equalization assembly, and is used for enabling, according to the voltage value of each naked cell monitored by the detection assembly, the equalization assembly to discharge the naked cells of which the voltage values are greater than a threshold. In the battery provided by the present application, the voltage values of the plurality of naked cells can be kept in a basically consistent state, thereby ensuring the service life and the safety of the battery.

Description

A battery and power system

Cross-references to related applications

This application claims priority to the Chinese patent application filed with the China Patent Office on August 15, 2022, with application number 202210973851.9 and application title "A battery and power system", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of energy technology, and in particular to a battery and power system.

Background technique

Sodium is abundant in resources and low in price. As technology continues to develop, sodium-ion batteries are expected to become a substitute for lithium-ion batteries. Limited by current materials and preparation processes, the voltage of a single bare cell of a sodium-ion battery is generally lower than 4V. In practical applications, it is usually necessary to connect multiple bare cells in series to form a module for use, so that a higher voltage can be output. However, in actual applications, if the consistency of the bare cells in the module is poor, it will reduce the performance of the entire module, especially the service life of the entire module. Therefore, when manufacturing bare cells, the bare cells are required to have good consistency. However, this will significantly increase the difficulty and cost of production, and will also reduce the yield rate of bare cells, leading to a waste of resources and not conducive to large-scale, low-cost production.

Therefore, how to improve the consistency of bare cells has become an urgent technical issue that needs to be solved.

Contents of the invention

This application provides a battery and power system that can effectively ensure the consistency of different bare cells.

On the one hand, the present application provides a battery, which may include a casing, a plurality of bare cells, a detection component, a balancing component and a battery management unit. The casing has a groove, a plurality of bare cells are arranged in the groove, and the plurality of bare cells are connected in series, thereby providing a higher operating voltage. The detection component is connected to the plurality of bare cells and is used to monitor the voltage of each of the plurality of bare cells. The balancing component is connected to multiple bare cells and can be used to discharge each bare cell. The battery management unit is connected to the detection component and the balancing component; wherein, the battery management unit is used to cause the balancing component to discharge the bare battery cells whose voltage value is greater than the threshold according to the voltage value of each bare cell monitored by the detection component, so that The voltage of each bare cell is basically the same.

In the battery provided by this application, the voltage value of each bare cell can be effectively monitored through the detection component; the battery management unit can control the working status of the balancing component based on the voltage value monitored by the detection component, so that multiple bare cells The voltage value of the battery cell remains basically consistent, thus ensuring the service life and safety of the battery.

In specific implementation, the threshold may be equal to the minimum voltage value of multiple bare cells. Alternatively, in some examples, the threshold may be slightly smaller than the minimum voltage value of the multiple bare cells. In practical applications, the threshold can be reasonably set according to actual needs.

In one example, the balancing component may include multiple balancing units, and the number of balancing units is the same as the number of bare cells and is arranged in one-to-one correspondence; wherein each balancing unit is connected in parallel with the corresponding bare cell. Or it can be understood that each bare cell is equipped with an independent balancing unit. Therefore, the balancing component can discharge each bare cell independently, which can It can effectively improve the efficiency and speed of discharge.

In specific settings, the balancing unit may include a resistor and a switch arranged in series, and the control end of the switch is connected to the battery management unit. The battery management unit can send a control signal to the switch through the control terminal, thereby controlling the on-off state of the switch.

When arranging the housing, the housing may have multiple grooves, and the plurality of grooves may be arranged in a row, thereby increasing the heat dissipation area of the housing.

In addition, the number of grooves can be the same as the number of bare cells. Each groove is provided with a bare cell, which can effectively isolate the bare cell and improve the heat dissipation performance of a single bare cell.

In one example, the tabs of each bare cell are made of the same material, and the tabs of two adjacent bare cells are connected by welding, which can improve the convenience of production and save the amount of material.

In specific settings, a gap may be provided between two adjacent grooves. In multiple bare battery cores, the tabs of two adjacent bare battery cores may pass through the gap.

In an example, the battery may further include a wireless communication module, and the battery management unit is connected to the wireless communication module. The battery management unit can communicate with other external devices through wireless communication, which avoids the need for additional cables and helps improve the convenience of battery deployment.

When specifically configured, the battery further includes a battery cover that covers the opening of the groove. In addition, the battery may also include a positive pole and a negative pole, both of which are arranged on the battery cover. The positive pole is connected to the positive poles of the multiple bare cells connected in series, and the negative pole is connected to the negative poles of the multiple bare cells connected in series. The electric energy of multiple bare cells can be transmitted to external electrical equipment through the positive and negative poles. Alternatively, external power generation equipment can supplement electrical energy to multiple bare cells through positive and negative poles.

In specific settings, the detection component, the balancing component and the battery management unit can all be arranged on the battery cover, which can improve the integration of the battery cover and help improve the convenience of assembly.

On the other hand, this application also provides a power system, which may include an inverter and any of the above-mentioned batteries. Among them, the inverter can be connected to the battery and can be used to convert alternating current into direct current and supply it to the battery, or convert direct current from the battery into alternating current. In specific applications, the power system can be an energy storage system, or a solar or wind power system. This application does not limit the specific type of the power system.

Description of drawings

Figure 1 is an exploded structural schematic diagram of a partial structure of a battery provided by an embodiment of the present application;

Figure 2 is a structural block diagram of a battery provided by an embodiment of the present application;

Figure 3 is a charging and discharging characteristic curve diagram of a bare battery core provided by an embodiment of the present application;

Figure 4 is a structural block diagram of another battery provided by an embodiment of the present application;

Figure 5 is a structural block diagram of a display equalization unit provided by an embodiment of the present application;

Figure 6 is a schematic diagram of the exploded structure of a battery provided by an embodiment of the present application;

Figure 7 is a schematic cross-sectional structural diagram of a battery provided by an embodiment of the present application;

Figure 8 is a schematic cross-sectional structural diagram of another battery provided by an embodiment of the present application;

Figure 9 is a structural block diagram of a power system provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be described in further detail below in conjunction with the accompanying drawings.

In order to facilitate understanding of the battery provided by the embodiment of the present application, its application scenarios are first introduced below.

The battery provided by the embodiment of the present application can be used in photovoltaic energy storage, data centers, vehicles and other scenarios to store and release electric energy.

In current practical applications, lithium-ion batteries are widely used in photovoltaic energy storage, data centers, vehicles and other scenarios due to their relatively mature manufacturing process and high energy density. However, the mineral reserves of lithium resources are low, and as people continue to develop and consume lithium resources, lithium resources have begun to show a trend of insufficient supply, causing the prices of raw materials for lithium batteries to continue to rise, and the prices of lithium batteries are also rising. . This increases the purchasing burden for consumers and is not conducive to the widespread application of clean energy.

The charge and discharge mechanism of sodium-ion batteries is similar to that of lithium-ion batteries, and sodium is abundant and cheap. Therefore, sodium-ion batteries are expected to replace lithium-ion batteries. However, due to current materials and preparation processes, the voltage of a single bare cell of a sodium-ion battery is generally lower than 4V, and cannot be directly used in scenarios with large voltage requirements. Therefore, in practical applications, it is usually necessary to connect multiple bare cells in series to form a module for use, so that a higher voltage can be output. However, in actual applications, if the consistency of the bare cells in the module is poor, it will reduce the performance of the entire module, especially the service life of the entire module.

Among them, the consistency of the bare battery core includes parameters such as voltage, temperature and pressure of the bare battery core. Among them, voltage consistency has a significant impact on the service life and safety of the module.

Based on this, embodiments of the present application provide a battery that can effectively improve the voltage consistency of bare cells.

In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

The terminology used in the following examples is for the purpose of describing specific embodiments only and is not intended to limit the application. As used in the specification and appended claims of this application, the singular expressions "a", "an" and "the" are intended to also include expressions such as "one or more" unless Its context clearly indicates the contrary. It should also be understood that in the following embodiments of this application, "at least one" means one, two or more than two.

Reference in this specification to "one embodiment" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, various appearances in this specification of the phrases "in one embodiment," "in some embodiments," "in additional embodiments," etc., are not necessarily all referring to the same embodiment, but rather means "one or more but not all embodiments" unless otherwise specifically emphasized. The terms "including", "having" and variations thereof all mean "including but not limited to" unless otherwise specifically emphasized.

As shown in FIG. 1 , in an example provided by this application, the battery 10 may include: a casing 11 and four bare cells, where the four bare cells are respectively a bare cell 12a, a bare cell 12b, Bare battery core 12c and bare battery core 12d. The housing 11 has grooves, respectively groove 111a, groove 111b, groove 111c and groove 111d. The bare battery core 12a may be disposed in the groove 111a, the bare battery core 12b may be disposed in the groove 111b, the bare battery core 12c may be disposed in the groove 111c, the bare battery core 12d may be disposed in the groove 111d, and more The bare cells can be connected in series, so that the battery 10 as a whole has a higher working voltage. In addition, please refer to FIG. 2 , the battery 10 also includes a detection component, a balancing component and a battery management unit (battery management unit, BMU). The detection component is connected to a plurality of bare cells and is used to monitor the voltage of each bare cell. The balancing component is connected to multiple bare cells and can be used to discharge each bare cell to reduce the corresponding The voltage value of the bare cell. The battery management unit is connected to the detection component and the balancing component. Among them, the battery management unit is used to monitor the voltage value of each bare cell according to the detection component, so that the balancing component discharges the bare cells whose voltage value is greater than the threshold, so that the voltage of each bare cell is basically the same.

In the battery 10 provided by the present application, the voltage value of each bare cell can be effectively monitored through a detection component. The battery management unit can control the working status of the balancing component based on the voltage value monitored by the detection component. For example, when the detection component detects that the voltage value of a certain bare cell is greater than the threshold, the balancing component can be made to discharge the bare cell to reduce the voltage value of the bare cell so that the voltage value of the bare cell approximately equal to this threshold. When the detection component detects that the voltage of a certain bare cell is approximately equal to the threshold, the balancing component may not discharge the bare cell. In summary, through detection components, battery management units and balancing components, it can be effectively ensured that the voltage values of multiple bare cells are equal to the threshold, thereby ensuring the service life and safety of the battery 10 .

As shown in Figure 3, it is the charge and discharge characteristic curve of a bare battery core provided by the embodiment of the present application. In Figure 3, the abscissa represents the electric quantity, the unit is Ah, and the ordinate represents the voltage value, the unit is V. The solid line represents the charging characteristic curve of the bare cell, and the dotted line represents the discharge characteristic curve of the bare cell.

It can be seen from Figure 3 that during the charging and discharging process of the bare battery core, the working voltage always changes with the change of the amount of electricity, that is, the working voltage of the bare battery core is not a stable value. Therefore, when the power of different bare cells is different, a voltage difference will occur. In this application, the balancing component can be used to discharge the bare battery core with a larger voltage value, thereby reducing the voltage value of the bare battery core and making it basically the same as the voltage value of other bare battery cores, thereby ensuring Battery life and safety.

In specific applications, the threshold can be approximately equal to the minimum voltage value among multiple bare cells. For example, taking four bare cells as an example, when the voltage values of the bare cells 12a, 12b, 12c, and 12d are 3V, 3V, 3.2V, and 3.5V respectively. The threshold may be 3V. Since the voltage value of the bare battery core 12c and the bare battery core 12d is greater than 3V, the bare battery core 12c and the bare battery core 12d may be discharged, so that the bare battery core 12c and the bare battery core 12d The voltage value is reduced to 3V. It can be understood that the threshold is not a specific value in a strict sense. In practical applications, there may be a certain deviation range. For example, the threshold may be 3V±0.05V, etc. In addition, when the balancing component discharges the bare battery core 12c and the bare battery core 12d, it may be during the charging process of the battery 10, or it may be during the process of the battery 10 supplying power to other electrical equipment. This application applies This is not a limitation.

In addition, as shown in FIG. 4 , in one example, the detection component may include multiple detection units, and each detection unit may independently monitor the voltage of the corresponding bare cell. Or it can be understood that the number of detection units and bare cells can be the same. Specifically, the detection unit a is connected to the bare battery core 12a for monitoring the voltage value of the bare battery core 12a; the detection unit b is connected to the bare battery core 12b for monitoring the voltage value of the bare battery core 12b; the detection unit c is connected to the bare battery core 12b. The battery core 12c is connected to monitor the voltage value of the bare battery core 12c; the detection unit d is connected to the bare battery core 12d and used to monitor the voltage value of the bare battery core 12d.

Or, in other examples, the detection component may also include a detection unit to reduce the cost of the detection component. Specifically, one detection unit can provide four detection channels, and the four detection channels and the four bare cells can correspond one to one.

In addition, the balancing component may include multiple balancing units, and each balancing unit may independently discharge the corresponding bare cell. Or it can be understood that the number of balancing units and bare cells can be the same, and each balancing unit can be connected in parallel with the corresponding bare cell. Specifically, the balancing unit a is connected in parallel with the bare battery core 12a, the balancing unit b is connected in parallel with the bare battery core 12b, the balancing unit c is connected in parallel with the bare battery core 12c, and the balancing unit d is connected in parallel with the bare battery core 12d.

In specific applications, one balancing unit can discharge the corresponding bare battery core, or there can be multiple balancing units discharging the corresponding bare battery core at the same time.

For example, as shown in Figure 4, when the voltage values of the bare battery core 12a, the bare battery core 12b, the bare battery core 12c and the bare battery core 12d are 3V, 3V, 3.2V and 3.5V respectively, the battery management unit can Calculate the voltage value of each bare cell, and the obtained threshold can be 3V. At this time, the battery management unit can cause the balancing unit c to discharge the bare battery core 12c, and at the same time, it can cause the balancing unit d to discharge the bare battery core 12d.

Of course, in some examples, the balancing unit may also discharge the bare cells in sequence. For example, the balancing unit c may first discharge the bare battery core 12c. When the power of the bare battery core 12c reaches about 3V, the balancing unit c ends the discharging process of the bare battery core 12c. Then the balancing unit d starts to discharge the bare battery core 12d.

It can be understood that in practical applications, the discharge sequence of different bare cells can be reasonably set according to actual needs, and this application does not limit this.

Alternatively, in some embodiments, the number of balancing units may be less than the number of bare cells. For example, the balancing unit d may be omitted, and the balancing unit c may be connected in parallel with the bare cell 12c and the bare cell 12d, so that the balancing unit c can discharge the bare cell 12c and the bare cell 12d.

In actual applications, the number and connection methods of balancing units can be reasonably set according to actual needs, which will not be described in detail here.

In addition, in specific settings, the specific types of balancing units can also be diverse.

For example, as shown in Figure 5, in an example provided by this application, the balancing unit includes a resistor R and a switch K set in series. The control end of the switch K can be connected to the battery management unit, and the battery management unit can connect to the battery management unit through the control end. The switch sends a control signal, thereby controlling the on-off state of the equalization unit.

Among them, one end of the balancing unit can be connected to the positive electrode of the bare battery core, and the other end is connected to the negative electrode of the bare battery core. When the switch K is in the on state, the electric energy in the bare cell can be consumed through the resistor R to reduce the voltage of the bare cell. When the switch K is in the off state, the positive and negative electrodes of the bare battery core are in the disconnected state. Therefore, the electric energy in the bare battery core will not be consumed by the equalizing resistor R.

It can be understood that in specific applications, the balancing unit may also include other devices that can consume electric energy. This application does not limit the specific type of the balancing unit.

When arranging the battery 10, its structure type may be diverse.

For example, as shown in Figure 6, in an example provided by this application, the housing 11 has four grooves, namely groove 111a, groove 111b, groove 111c and groove 111d. The four grooves are along the The first direction is set in a row.

When the grooves are arranged in a row, the heat conduction efficiency between the bare battery core and the case 11 can be effectively improved, and the heat dissipation area of the case 11 can also be increased, which is conducive to improving the heat dissipation performance of the battery 10 and effectively preventing the battery 10 from appearing. Overheating condition. In addition, multiple bare cells can be independent of each other to avoid mutual interference, which can effectively improve the safety of the battery 10 .

It can be understood that in other examples, the battery 10 may also include multiple housings 11 , and the multiple housings 11 may be arranged in parallel, that is, the multiple housings 11 may be arranged sequentially along the second direction. Alternatively, the plurality of housings 11 can also be arranged sequentially along the first direction, which will not be described again here.

It can be understood that in other examples, the housing 11 may also include a groove, and multiple bare cells may be disposed in the same groove. Alternatively, the number of grooves may be less than the number of bare cells. In actual applications, the number and arrangement of grooves and bare cells can be reasonably set according to different needs, which will not be described in detail here.

When manufacturing the housing 11, the housing 11 can be made of metal materials such as aluminum, aluminum alloy or steel, so that The housing 11 has good structural strength and heat dissipation performance. The housing 11 can be formed by stamping or drilling. Of course, in practical applications, the material and preparation process of the housing 11 can be flexibly selected according to actual needs, and this application does not limit this.

When the bare cells are connected in series and parallel, the tabs of different bare cells can be connected by welding, thereby saving material costs.

It should be noted that in the examples provided in this application, the bare battery core 12a, the bare battery core 12b, the bare battery core 12c and the bare battery core 12d are all sodium ion battery cells. Therefore, the positive electrode tab of each bare battery core and The negative tabs can all be made of aluminum. When connecting two bare cells in series, the positive tab of the bare cell can be directly welded to the negative tab of another bare cell.

Alternatively, it can be understood that in current lithium-ion batteries, the material of the positive tab is usually aluminum, and the material of the negative tab is usually nickel. When welding the positive electrode tab and the negative electrode tab, it is difficult to weld due to the different materials of the positive electrode tab and the negative electrode tab, and the welding effect is unstable. Therefore, in practical applications, auxiliary connections are usually included to achieve series and parallel connections between different lithium-ion cells.

In the example provided in this application, the bare battery core is a sodium ion battery core. Therefore, the material of the positive electrode lug and the negative electrode lug can be aluminum. When welding the positive electrode lug and the negative electrode lug of the same material, the welding difficulty can be reduced. And ensure the welding effect. In addition, the use of additional auxiliary connectors can be avoided, which can save material costs and manufacturing processes, and help improve manufacturing efficiency.

As shown in Figure 6, in the example provided by this application, the bare battery core 12a has a positive electrode lug 121a and a negative electrode lug 122a; the bare battery core 12b has a positive electrode lug 121b and a negative electrode lug 122b; the bare battery core 12c has a positive electrode lug 121c and a negative electrode. The bare battery core 12d has a positive electrode ear 121d and a negative electrode ear 122d.

Among them, the negative electrode lug 122a is welded and connected to the positive electrode lug 121b, the negative electrode lug 122b is welded and connected to the positive electrode lug 121c, and the negative electrode lug 122c is welded and connected to the positive electrode lug 121d, so that the bare battery core 12a, the bare battery core 12b, the bare battery core 12c and the Series connection between bare cells 12d.

In addition, as shown in FIG. 6 , in an example provided by this application, there is a gap between two adjacent grooves, and the tabs of two adjacent bare cells can pass through the gap.

For example, the negative electrode lug 122a of the bare battery core 12a and the positive electrode lug 121b of the bare battery core 12b can be provided with a notch 112a, so as to improve the connection effect between the bare battery core 12a and the bare battery core 12b and prevent the groove 111a and the groove The shell structure between 111b forms a barrier to the negative electrode tab 122a and the positive electrode tab 121b.

In addition, as shown in FIG. 6 , in an example provided by this application, the battery 10 further includes a cover plate 13 , and the cover plate 13 can cover the opening of the groove to ensure the sealing of the groove.

In the example provided in this application, the number of cover plates 13 is one, that is, one cover plate 13 can cover the openings of four grooves at the same time, thereby improving the convenience during assembly.

Of course, in other examples, the number of cover plates 13 can also be the same as the number of grooves. That is, each groove can be covered by an independent cover plate 13 .

In specific applications, the cover plate 13 can be made of metal materials such as aluminum, aluminum alloy, or steel, so that the cover plate 13 has good structural strength. During preparation, the cover plate 13 can be formed by stamping, cutting or other processes. Of course, in other examples, the cover plate 13 can also be made of non-metallic materials such as resin. This application does not limit the specific material and preparation process of the cover plate 13 .

In addition, as shown in FIG. 6 , the battery 10 also includes a positive electrode post 131 and a negative electrode post 132 . The positive electrode post 131 can be connected to the positive electrode lug 121a of the bare battery core 12a, and the negative electrode post 132 can be connected to the negative electrode lug 122d of the bare battery core 12d. Or, can It is understood that the electric energy of the four bare cells can be transmitted to external electrical equipment through the positive pole 131 and the negative pole 132 . Alternatively, external power generation equipment can supplement electric energy to the four bare cells through the positive pole 131 and the negative pole 132 .

In specific applications, the structural shapes of the positive pole 131 and the negative pole 132 may be diverse.

For example, the positive electrode post 131 and the negative electrode post 132 may be cylindrical structures. Alternatively, the positive electrode column 131 and the negative electrode column 132 can also be conductive sheets or other shapes and structures. This application does not limit the specific shapes of the positive electrode column 131 and the negative electrode column 132 .

In addition, the positive electrode post 131 and the positive electrode lug 121a may be connected by welding, abutting or screwing. Correspondingly, the negative electrode post 132 and the negative electrode lug 122d may be connected by welding, abutting or screwing. This application does not limit the connection method between the positive electrode post 131 and the positive electrode tab 121a and the connection method between the negative electrode post 132 and the negative electrode tab 122d.

In addition, as shown in FIG. 7 , during specific configuration, the detection component, the balancing component and the battery management unit 16 can all be arranged in the cover 13 so that the cover 13 can control the detection component, the balancing component and the battery management unit 16 . to a good protective effect. In addition, the battery management unit 16 can be connected to an external battery management system (battery management system, BMS) and other equipment through a cable (not shown in Figure 7).

Alternatively, the battery management unit 16 and the battery management system may also communicate through wireless communication.

For example, as shown in Figure 7, in an example provided by this application, the battery 10 also includes a wireless communication module 17. The wireless communication module 17 is connected to the battery management unit 16. The battery management unit 16 can communicate with the outside world through the wireless communication module 17. Perform wireless access. Among them, the wireless communication module 17 can be a device that meets wireless technical standards such as Bluetooth or WiFi. This application does not limit the specific type, operating frequency band and technical standards of the wireless communication module 17 .

In addition, it should be noted that when the cover 13 is made of metal materials such as aluminum, it will produce an electromagnetic shielding effect on the wireless communication module 17 and affect normal communication between the wireless communication module 17 and external devices. Therefore, in practical applications, the cover plate 13 can be made of insulating materials such as polypropylene or polyethylene. Alternatively, a partial area of the cover 13 can be made of insulating material, and the wireless communication module 17 can conduct wireless communication with the outside world through this partial area.

In addition, in an example provided by this application, the battery cover 13 may also include an explosion-proof structure. When the air pressure in the groove is too high, the explosion-proof structure can realize pressure relief to prevent the battery 10 from exploding and other undesirable situations.

Specifically, in the example provided in this application, the battery cover 13 includes four explosion-proof structures, namely an explosion-proof structure 18a, an explosion-proof structure 18b, an explosion-proof structure 18c and an explosion-proof structure 18d. Among them, the explosion-proof structure 18a is arranged corresponding to the groove 111a, the explosion-proof structure 18b is arranged corresponding to the groove 111b, the explosion-proof structure 18c is arranged corresponding to the groove 111c, and the explosion-proof structure 18d is arranged corresponding to the groove 111d. That is, each groove is equipped with a corresponding explosion-proof structure, which can effectively improve the safety of the battery 10 .

In specific settings, the explosion-proof structure may be a well-known conventional structure such as an explosion-proof membrane or an explosion-proof valve, which will not be described in detail here.

In addition, the cover 13 also has a liquid injection hole, which can be used to inject electrolyte into the groove. Specifically, there are four liquid injection holes, namely the liquid injection hole 19a, the liquid injection hole 19b, the liquid injection hole 19c and the liquid injection hole 19d. Among them, the liquid injection hole 19a is provided corresponding to the groove 111a, the liquid injection hole 19b is provided corresponding to the groove 111b, the liquid injection hole 19c is provided corresponding to the groove 111c, and the liquid injection hole 19d is provided corresponding to the groove 111d.

In addition, in some examples, the detection component may also include a sensor for monitoring temperature or pressure. When setting, the entire detection component may be arranged in the cover plate 13 . Specifically, the detection components 14a, 14b, 14c and 14d may all be disposed in the cover plate 13. When manufacturing the cover plate 13, the above-mentioned detection component can be integrated with the cover plate 13, which can effectively improve the convenience during assembly. It can be understood that the probe in the detection component can be extended into the corresponding groove, so that parameters such as temperature and pressure in the groove can be measured effectively. effective monitoring.

Alternatively, in some examples, some of the sensors in the detection assembly may also be disposed in the groove.

For example, as shown in FIG. 8 , in one example, the sensors 141 a , 141 b , 141 c and 141 d may also be disposed in corresponding grooves 111 a , 111 b , 111 c and 111 d respectively.

In practical applications, the installation position of the sensor can be reasonably set according to different needs, and this application does not limit this.

In addition, in practical applications, the battery 10 provided by the embodiment of the present application can be used in a variety of different application scenarios.

For example, as shown in FIG. 9 , this embodiment of the present application also provides a power system 20 . The power system 20 may include an inverter 21 , a power device 22 and any of the above-mentioned batteries 10 . The power device 22 can be connected to the battery 10 through the inverter 21 . The type of electric energy in the battery 10 is generally direct current, and the type of electric power used by the power equipment 22 may be alternating current. The inverter 21 can be used to achieve conversion between alternating current and direct current.

In specific applications, the power equipment 22 may be a wind power generation device or a solar power generation device, or the like. Alternatively, it will be appreciated that power system 20 may be a wind power power system or a solar power power system.

In addition, in some embodiments, the power equipment 22 may also be electrical equipment such as a motor. This application does not limit the specific type of the power equipment 22 .

Alternatively, the battery 10 can be used in terminals such as mobile phones, vehicles, ships, drones or base stations, and can also be used for energy storage in power stations or home energy storage. This application does not limit the application scenarios of the battery 10 .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, and all of them should be covered. within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A battery, characterized in that it includes:

Shell, with groove;

A plurality of bare battery cores are arranged in the groove, and the plurality of bare battery cores are connected in series;

A detection component, connected to the plurality of bare cells, for monitoring the voltage of each of the plurality of bare cells;

a balancing component, connected to the plurality of bare cells, and capable of discharging each of the plurality of bare cells;

A battery management unit connected to the detection component and the balancing component;

Wherein, the battery management unit is configured to cause the balancing component to discharge the bare battery cells whose voltage value is greater than a threshold among the plurality of bare battery cells according to the voltage value of each bare battery cell monitored by the detection component. .
The battery according to claim 1, wherein the threshold value is equal to the minimum voltage value of the plurality of bare cells.
The battery according to claim 2, wherein the balancing component includes a plurality of balancing units, and the number of the balancing units is the same as the number of bare cells in the plurality of bare cells and is arranged in one-to-one correspondence. ;

Wherein, each balancing unit is connected in parallel with a corresponding bare cell.
The battery according to claim 3, wherein the balancing unit includes a resistor and a switch arranged in series, and the control end of the switch is connected to the battery management unit.
The battery according to any one of claims 1 to 4, wherein the housing has a plurality of grooves, and the plurality of grooves are arranged in a row;

Wherein, the number of the grooves is the same as the number of bare cells in the plurality of bare cells, and one bare cell is provided in each groove.
The battery according to claim 5, wherein the material of the tabs of each bare cell among the plurality of bare cells is the same, and the tabs of two adjacent bare cells are welded together.
The battery according to claim 5 or 6, characterized in that there is a gap between two adjacent grooves, and among the plurality of bare cells, the tabs of two adjacent bare cells Puncture the notch.
The battery according to any one of claims 1 to 7, wherein the battery further includes a wireless communication module, and the battery management unit is connected to the wireless communication module.
The battery according to any one of claims 1 to 8, wherein the battery further includes a battery cover, and the battery cover covers the opening of the groove.
The battery according to claim 9, wherein the battery includes a positive pole and a negative pole, and both the positive pole and the negative pole are arranged on the battery cover;

The positive pole is connected to the positive poles of the plurality of bare cells connected in series, and the negative pole is connected to the negative poles of the plurality of bare cells connected in series.
The battery according to claim 9 or 10, characterized in that the detection component, the balancing component and the battery management unit are all provided on the battery cover.
A power system, characterized in that it includes an inverter and the battery according to any one of claims 1 to 11, the inverter is connected to the battery and is used to convert alternating current into direct current and provide it to The battery, alternatively, converts direct current from the battery into alternating current.