Battery monomer and battery module

Abstract

The utility model provides a battery monomer and a battery module, and relates to the technical field of batteries. The single battery comprises a shell and a battery cell arranged in the shell, and further comprises a top cover with a containing cavity, and the top cover is connected with the shell to cover the containing cavity; the emitter is arranged in the accommodating cavity, is fixed on the inner wall of the top cover, and is connected with an external equalization power supply when equalization is needed; the receiver is fixed on the end face, close to the top cover, of the battery cell and is electrically connected with the first electrode and the second electrode, and the receiver and the emitter are correspondingly arranged and are connected through magnetic induction.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and in particular, to a battery cell and a battery module. Background Art

[0002] With the technological iteration in energy storage systems, products with large-sized cells and large capacities are gradually increasing, and the consistency problem of battery systems has become increasingly serious.

[0003] In related technologies, the inconsistency of battery systems is reduced through balancing technologies, which include passive balancing and active balancing. However, both of the above two balancing technologies use a battery management system to balance the cells through physical wire harnesses. Limited by the wire diameter of the wire harness and the heat generation of the battery management system, problems such as poor balancing effect and low efficiency occur. Summary of the Utility Model

[0004] The present disclosure provides a battery cell and a battery module, which at least overcome to a certain extent the problems of poor balancing effect and low efficiency of the balancing technology for cells in related technologies.

[0005] Other features and advantages of the present disclosure will become apparent through the following detailed description, or will be partially learned through the practice of the present disclosure.

[0006] According to one aspect of the present disclosure, a battery cell is provided, including: a housing, and a cell disposed within the housing; wherein, the battery cell further includes:

[0007] A top cover having a cavity, the top cover being connected to the housing to cover the cavity;

[0008] A transmitter disposed within the cavity, the transmitter being fixed to the inner wall of the top cover, and the transmitter being connected to an external balancing power supply when balancing is required;

[0009] A receiver disposed within the cavity, the receiver being fixed to the end face of the cell close to the top cover and electrically connected to the first electrode and the second electrode of the cell, the receiver being correspondingly disposed with the transmitter and connected by magnetic induction.

[0010] In an embodiment of the present disclosure, the receiver includes a receiving body, two connection holes are provided on the receiving body, conductive materials are provided on the inner walls of the two connection holes, and the two connection holes are in interference fit with the first electrode and the second electrode respectively.

[0011] In an embodiment of the present disclosure, the receiver further includes a first controller disposed on the receiving body;

[0012] At least one temperature sensor is provided on the receiving body opposite to the end face, and the at least one temperature sensor is connected to the first controller for collecting the temperature of the battery cell; and / or

[0013] The first electrode and the second electrode are connected with a voltage sensor, and the voltage sensor is connected to the first controller.

[0014] In an embodiment of the present disclosure, at least one heat insulation pad is provided between the receiving body and the end face of the battery core close to the top cover, and an installation hole for accommodating the temperature sensor is provided on the at least one heat insulation pad.

[0015] In an embodiment of the present disclosure, the receiver further includes a receiving coil, a first resonant capacitor, and a first rectifier bridge connected in series.

[0016] In an embodiment of the present disclosure, the transmitter is pasted on the inner wall of the top cover, and / or an installation groove for accommodating the transmitter is provided on the inner wall of the top cover.

[0017] In an embodiment of the present disclosure, the transmitter is provided with a power pin connected to the external balancing power supply, and an insertion interface corresponding to the power pin is provided on the side wall of the top cover, and the power pin passes through the insertion interface to expose the power pin;

[0018] The power pin is movably connected with a plug.

[0019] In an embodiment of the present disclosure, the transmitter includes a transmitting coil, a second resonant capacitor, an inverter circuit, a chopper circuit, a second rectifier bridge, and an external balancing power supply connected in series;

[0020] The transmitter further includes a second controller, and the second controller performs wireless communication with the first controller in the receiver.

[0021] In an embodiment of the present disclosure, the distance between the center point of the receiver and the center point of the transmitter is not greater than 10 cm.

[0022] According to another aspect of the present disclosure, a battery module is further provided, including a plurality of conductive structures and a plurality of the above-mentioned battery cells, and adjacent battery cells are connected in series through one of the conductive structures.

[0023] In an embodiment of the present disclosure, a battery cell includes a housing and a battery core disposed within the housing. The battery cell further includes a top cover having a cavity, a transmitter and a receiver within the cavity, and the top cover is connected to the housing; the transmitter is fixed to the inner wall of the top cover and is connected to an external balancing power source when balancing is required; the receiver is fixed to the end face of the battery core close to the top cover and is electrically connected to a first electrode and a second electrode. The receiver is disposed corresponding to the transmitter and is connected by magnetic induction. On the one hand, in the present disclosure, only by connecting the transmitter within the battery cell to be balanced to an external balancing power source, the balancing of the battery cell can be achieved; on the other hand, the present disclosure does not require additional balancing wiring harnesses, eliminating the problem of wiring harness heating. Wireless charging is performed on the battery cell to be balanced by the balancing power source, and the magnitude of the balancing current, or the charging current of the battery cell, can be flexibly designed according to the capabilities of the battery core, enabling fast balancing with a large current. Thereby, the balancing efficiency and safety of the battery cell are improved, the overall service life of the system is extended, the after-sales maintenance cost is reduced, and the user experience is better.

[0024] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure and, together with the specification, are used to explain the principles of the present disclosure. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0026] Figure 1 A schematic structural diagram showing an exemplary application scenario of an energy storage system provided in an embodiment of the present disclosure.

[0027] Figure 2 A perspective view of a battery cell provided in an embodiment of the present disclosure.

[0028] Figure 3 An exploded view of a battery cell provided in an embodiment of the present disclosure.

[0029] Figure 4 A schematic structural diagram of a receiver provided in an embodiment of the present disclosure.

[0030] Figure 5 A communication schematic diagram of a receiver and a transmitter provided in an embodiment of the present disclosure.

[0031] Figure 6 A perspective view of a battery module provided in an embodiment of the present disclosure.

[0032] Figure 7The internal structure diagram of a battery module provided by an embodiment of the present disclosure is shown.

[0033] Among them, the description of the reference numerals is as follows:

[0034] 110, energy storage device; 120, high-voltage cable; 130, first power conversion device; 140, second power conversion device;

[0035] 200, battery cell;

[0036] 211, top cover; 2111, insertion interface; 2112, avoidance hole; 212, end face; 2121, first electrode; 2122, second electrode; 213, transmitter; 2131, power supply pin; 2132, transmitting coil; 2133, inverter circuit; 2134, chopper circuit; 2135, second rectifier bridge; 214, receiver; 2141, connection hole; 2142, temperature sensor; 2143, receiving coil; 2144, first rectifier bridge; 215, plug; 216, conductive bar; 217, bus bar; 218, housing;

[0037] 300, battery module. Detailed implementation manners

[0038] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0039] The terms "first" and "second" in the text are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more, unless otherwise clearly specified.

[0040] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection or a communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between various embodiments and / or settings discussed.

[0042] Since the energy required by people has strong temporality and spatiality, in order to rationally utilize energy and improve the energy utilization rate, it is necessary to store one form of energy in the same or converted into another form of energy through a medium or device and release it in a specific energy form based on future application needs. Currently, the main way to generate green electric energy is to develop green energy such as photovoltaic and wind power to replace fossil energy.

[0043] Currently, the generation of green electric energy generally depends on photovoltaic, wind power, water potential, etc. Wind energy and solar energy generally have problems of strong intermittency and large volatility, which will cause grid instability, insufficient electricity during peak electricity consumption, too much electricity during low electricity consumption, and unstable voltage will also damage the power. Therefore, the problem of "abandoning wind and light" may be caused due to insufficient electricity demand or insufficient grid acceptance capacity. To solve these problems, energy storage is required. That is, the electric energy is converted into other forms of energy through physical or chemical means and stored, and the energy is converted into electric energy and released when needed. Simply put, energy storage is similar to a large "portable power bank", which stores electric energy when photovoltaic and wind energy are sufficient and releases the stored electric power when needed.

[0044] Taking electrochemical energy storage as an example, the present disclosure provides an energy storage device. A group of chemical batteries are provided in the energy storage device, which mainly uses chemical elements in the batteries as energy storage media. The charge and discharge process is accompanied by chemical reactions or changes of the energy storage media. Simply put, the electric energy generated by wind energy and solar energy is stored in the chemical batteries, and the stored electricity is released when the external electricity usage reaches the peak, or transferred to places with tight electricity for further use.

[0045] Currently, the application scenarios of current energy storage (i.e., energy storage) are relatively extensive, including power generation side energy storage, grid side energy storage, and user side energy storage, etc. The types of corresponding energy storage devices include:

[0046] (1) Large-scale energy storage power stations applied on the wind power and photovoltaic power station sides can assist renewable energy power generation to meet grid connection requirements, and at the same time improve the utilization rate of renewable energy; as a high-quality active / reactive power regulation power source on the power supply side, the energy storage power station realizes the load matching of electric energy in time and space, enhances the consumption capacity of renewable energy, reduces the instantaneous power change, reduces the impact on the power grid, improves the problem of new energy power generation consumption, and is of great significance in the power grid system standby, alleviating the power supply pressure during peak loads and peak shaving and frequency modulation.

[0047] (2) Energy storage containers applied on the power grid side are mainly used for peak shaving, frequency modulation, and alleviating grid congestion peak shaving. They can achieve peak shaving and valley filling of the electricity load, that is, charging the energy storage battery during the low electricity load period and releasing the stored electricity during the high electricity load period, so as to achieve the balance between power production and consumption.

[0048] (3) Small energy storage cabinets applied on the user side are mainly used for self-use of electricity, peak-valley price difference arbitrage, capacity charge management, and improving power supply reliability. According to different application scenarios, the energy storage on the user side can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in combination with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price difference arbitrage and capacity charge management. In the electricity market implementing peak-valley electricity prices, by charging the energy storage system at low electricity prices and discharging the energy storage system at high electricity prices, peak-valley electricity price difference arbitrage is realized, and the electricity consumption cost is reduced. In addition, industrial enterprises applicable to two-part electricity prices can use the energy storage system to store energy during the low electricity consumption period and discharge it during the peak load period, so as to reduce the peak power and the declared maximum demand, and achieve the purpose of reducing the capacity electricity charge. Household photovoltaic energy storage can improve the level of self-use of electricity. Due to the high electricity price and poor power supply stability, the demand for household photovoltaic installations is driven. Considering that photovoltaics generate electricity during the day while users generally have a higher load at night, by configuring energy storage, photovoltaic power can be better utilized, the level of self-use is improved, and the electricity consumption cost is reduced at the same time. In addition, energy storage needs to be configured in fields such as communication base stations and data centers for backup power supplies.

[0049] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the energy storage system according to an embodiment of the present disclosure, and the embodiment of the present disclosure Figure 1 illustrates by taking the shared energy storage scenario on the power generation / distribution side as an example, and the energy storage system 100 of the present disclosure is not limited to its energy storage scenario on the power generation / distribution side.

[0050] The present disclosure provides an energy storage system, which includes: an energy storage device 110, a high-voltage cable 120, a first power conversion device 130, and a second power conversion device 140. In the case of power generation, the first power conversion device 130 and the second power conversion device 140 are used to convert other forms of energy into electrical energy, connect to the high-voltage cable 120 and supply it for use on the power consumption side of the distribution network. When the power consumption load is low and the first conversion device 130 and the second power conversion device 140 generate an excess of electricity, the excess electricity is stored in the energy storage device 110 to reduce the curtailment rate of wind and light and improve the problem of new energy power generation accommodation. When the power consumption load is high, the power grid issues an instruction to transmit the electricity stored in the energy storage device 110 in a grid-connected mode in cooperation with the high-voltage cable 120 to supply the power consumption side for use, providing various services such as peak shaving, frequency modulation, and standby for the operation of the power grid, giving full play to the role of the power grid in peak shaving, promoting the peak shaving and valley filling of the power grid, and alleviating the power supply pressure of the power grid.

[0051] Optionally, the first power conversion device 130 and the second power conversion device 140 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0052] The number of the energy storage devices 110 can be multiple. The multiple energy storage devices 110 are connected in series or in parallel with each other, and the multiple energy storage devices 110 are supported and electrically connected by a separator (not shown in the figure). In this embodiment, "multiple" means two or more. An energy storage box can also be provided outside the energy storage device 110 for accommodating the energy storage device 110.

[0053] Optionally, the energy storage device 110 can include, but is not limited to, battery cells, a battery equalization system, battery packs, battery systems, etc. The actual application form of the energy storage device 110 provided in the embodiments of the present disclosure can be, but is not limited to, the listed products, and can also be other application forms. The embodiments of the present disclosure do not strictly limit the application form of the energy storage device 110. The embodiments of the present disclosure only take the energy storage device 110 as a battery cell as an example for illustration. When the energy storage device 110 is a battery cell, the energy storage device 110 can be at least one of a cylindrical battery, a square battery, etc. The battery pack includes a box body and an upper cover, and a battery module 300 composed of a plurality of battery cells 200 connected in series and in parallel is arranged in the box body. With the continuous development of the energy storage system, the number of large-sized battery cells and high-capacity products increases, and the consistency problem of the battery system becomes more and more serious. For the situation where the voltage difference or temperature difference of the battery cells is too large, it can be optimized through the equalization technology of the Battery Management System (BMS).

[0054] The equalization techniques include active equalization and passive equalization. Among them, passive equalization is achieved by dissipating the energy of the cell with a high voltage through the heat generated by a resistor, and active equalization is achieved by transferring energy from the high-energy cell to the low-energy cell. Both of the above equalization methods are carried out through the slave BMS via a physical wire harness.

[0055] For passive equalization, the equalization current is small, usually about 100 mA. For large cells and high-capacity products, it takes a long time for passive equalization to show an equalization effect, which affects the use of the energy storage system. For the energy storage system, passive equalization is slightly insufficient; for active equalization, the equalization current is large, usually between 2 A and 5 A, but active equalization has strict requirements for wire harnesses, safety, heat generation, structure, etc. Usually, one equalization module corresponds to one cell, and the equalization efficiency is not high.

[0056] Both the above passive equalization and active equalization use the BMS to perform equalization through a physical wire harness. The equalization technology is limited by the wire diameter of the wire harness. When the wire diameter of the wire harness is small, long-time and large-current equalization cannot be achieved, resulting in low equalization efficiency of battery cells, potential safety hazards, and short service life of battery cells. To solve at least some of the above technical problems, the battery cell 200 of the present disclosure includes a housing 218 and cells disposed within the housing 218. The battery cell 200 further includes a top cover 211 having a cavity, a transmitter 213 and a receiver 214 within the cavity. The top cover 211 is connected to the housing 218; the transmitter 213 is fixed to the inner wall of the top cover 211 and is connected to an external equalization power supply when equalization is required; the receiver 214 is fixed to the end face 212 of the cell close to the top cover 211 and is electrically connected to the first electrode 2121 and the second electrode 2122 of the cell. The receiver 214 is disposed corresponding to the transmitter 213 and is connected by magnetic induction. On the one hand, in the present disclosure, only by connecting the transmitter 213 in the battery cell 200 to be equalized to an external equalization power supply, the equalization of the battery cell 200 can be achieved; on the other hand, the present disclosure does not require an additional equalization wire harness, eliminating the problem of wire harness heating. Wireless charging is performed on the battery cell to be equalized through the equalization power supply. The magnitude of the equalization current, or the charging current of the battery cell, can be flexibly designed according to the capabilities of the battery cell, enabling large-current and rapid equalization, thereby improving the equalization efficiency and safety of the battery cell 200, extending the overall service life of the system, reducing the after-sales maintenance cost, and providing a better user experience. Specific embodiments are described as follows:

[0057] Figure 2 A perspective view of a battery cell 200 provided by an embodiment of the present disclosure is shown. Figure 3 An exploded view of a battery cell 200 provided by an embodiment of the present disclosure is shown. In combination with Figure 2 and Figure 3, in the battery cell 200 of the embodiments of the present disclosure, it includes a housing 218 and a battery cell disposed within the housing 218, and a first electrode 2121 and a second electrode 2122 are provided on the battery cell.

[0058] The battery cell 200 further includes: a top cover 211 having a cavity, a transmitter 213 and a receiver 214 disposed within the cavity; wherein, the top cover 211 is connected to the housing 218 to cover the cavity; the transmitter 213 is fixed to the inner wall of the top cover 211, and the transmitter 213 is connected to an external balancing power supply when balancing is required; the receiver 214 is fixed to the end face 212 of the battery cell close to the top cover 211 and is electrically connected to the first electrode 2121 and the second electrode 2122, and the receiver 214 is disposed corresponding to the transmitter 213 and is connected by magnetic induction.

[0059] In one embodiment, the housing 218 can be a cylindrical housing or a housing with a rectangular cross-section, and the shape of the housing 218 can be determined according to actual needs.

[0060] The first electrode 2121 and the second electrode 2122 are disposed on the end face 211 of the battery cell close to the top cover 211, and the polarities of the first electrode 2121 and the second electrode 2122 are opposite. For example, the first electrode 2121 can be connected to the anode plate, and the second electrode 2122 is connected to the cathode plate; or the first electrode 2121 can be connected to the cathode plate, and the second electrode 2122 is connected to the anode plate. The present disclosure does not make specific limitations.

[0061] The top cover 211 has a cavity, and the cavity can accommodate the first electrode 2121 and the second electrode 2122, or can also accommodate the transmitter 213 and the receiver 214.

[0062] In one embodiment, the receiver 214 and the transmitter 213 are disposed corresponding to each other within the cavity, and the two can be connected by magnetic induction. Corresponding setting means that the receiver 214 and the transmitter 212 correspond one by one, so as to control the corresponding receiver 214 through the transmitter 212 within the battery cell 200.

[0063] The receiver 214 is fixed to the end face 212 of the battery cell close to the top cover 211, the transmitter 213 is fixed to the top cover 211, the receiver 214 is connected to the first electrode 2121 and the second electrode 2122, and the transmitter 213 is connected to an external balancing power supply when balancing is required. The external balancing power supply can be alternating current, such as mains power. When a battery cell 200 needs to be balanced, the transmitter 213 can be connected to the external balancing power supply, and the transmitter 213 generates an alternating magnetic field, converting electrical energy into magnetic energy. When the receiver 214 is placed within the magnetic field range emitted by the transmitter 213, according to the principle of electromagnetic induction, the receiver 214 generates an induced current, thereby charging the battery cell 200 to achieve balancing.

[0064] The top cover 211 and the outer shell 218 are detachably connected. For example, they are connected by means of snap connection, bolts, etc., so as to facilitate the disassembly and assembly of the top cover 211 and facilitate the replacement of components.

[0065] In one embodiment, the distance between the center point of the receiver 214 and the center point of the transmitter 213 is not greater than 10 cm. It should be noted that the distance between the center point of the receiver 214 and the center point of the transmitter 213 refers to the radius of the spherical surface with the center point of the transmitter 213 as the center of the circle. That is, the transmitter 213 can be placed at any position in the cavity, as long as the distance from the center point of the receiver 214 is not greater than 10 cm, it can ensure that the receiver 214 can sense the magnetic field of the transmitter 213, thereby ensuring the wireless balancing effect.

[0066] In other embodiments, the axes of the receiving coil 2143 of the receiver 214 and the transmitting coil 2132 of the transmitter 213 are parallel to each other, and the distance between the center point of the receiving coil 2143 and the center point of the transmitting coil 2132 is not greater than 10 cm.

[0067] It should be noted that a liquid injection port for injecting electrolyte and an explosion-proof valve are provided on the end face 212, and the transmitter 213 and the receiver 214 are also provided with through holes for avoiding the explosion-proof valve.

[0068] In the embodiment of the present disclosure, the battery cell 200 includes an outer shell 218 and an electric core placed in the outer shell 218. The battery cell 200 also includes a top cover 211 having a cavity, a transmitter 213 and a receiver 214 in the cavity. The top cover 211 is connected to the outer shell 218; the transmitter 213 is fixed on the inner wall of the top cover 211 and is connected to an external balancing power supply when balancing is required; the receiver 214 is fixed on the end face 212 of the electric core close to the top cover 211 and is electrically connected to the first electrode 2121 and the second electrode 2122 of the electric core. The receiver 214 is arranged corresponding to the transmitter 213 and is connected by magnetic induction. On the one hand, in the present disclosure, only by connecting the transmitter 213 in the battery cell 200 to be balanced to the balancing power supply, the balancing of the battery cell 200 can be realized; on the other hand, the present disclosure does not need to additionally increase balancing wire harnesses, eliminating the problem of wire harness heating. The balancing power supply wirelessly charges the battery cell to be balanced, and the magnitude of the balancing current or the charging current of the battery cell can be flexibly designed according to the capacity of the battery cell, realizing large-current rapid balancing, thereby improving the balancing efficiency and safety of the battery cell 200, improving the overall service life of the system, reducing the after-sales maintenance cost, and providing a better user experience.

[0069] The connection between the receiver 214 and the electrodes can be achieved by wire connection, that is, the first electrode 2121 and the second electrode 2122 are respectively connected to the receiver 214 through wires to form a balanced circuit; other contact methods can also be used to realize the electrical connection between the receiver 214 and the first electrode 2121 and the second electrode 2122.

[0070] For example, the product type of the receiver 214 can be designed to be nested into the double connection holes 2141 of the electrode, and an interference contact method is adopted to realize the fixation of the receiver 214.

[0071] Figure 4 The schematic structural diagram of a receiver 214 provided by an embodiment of the present disclosure is shown. As Figure 4 shown, in one embodiment, the receiver 214 includes a receiving body, and two connection holes 2141 are provided on the receiving body. The inner walls of the two connection holes 2141 are provided with conductive materials, and the two connection holes 2141 are in interference fit with the first electrode 2121 and the second electrode 2122 respectively.

[0072] The receiving body is a rectangular plate, the connection holes 2141 are circular holes, and the diameter of the connection holes 2141 is slightly smaller than the diameter of the first electrode 2121 or the second electrode 2122, so that the electrode is in interference fit with the connection holes 2141.

[0073] The conductive material can be metal materials such as gold, silver, copper, aluminum or other materials with good conductivity. For example, a copper foil is provided on the inner wall of the connection holes 2141 to realize the connection between the receiver 214 and the electrodes.

[0074] In the embodiment of the present disclosure, by providing the connection holes 2141 on the receiving body, the fixation of the connection holes 2141 and the electrodes is realized through interference fit, the fixation of the receiver 214 is realized, and the electrical connection between the battery cell 200 and the receiver 214 is realized, and the connection method is simple.

[0075] Continue to refer to Figure 4 , in one embodiment, the receiver 214 further includes a first controller (not shown in Figure 4 ); at least one temperature sensor 2142 is provided on the receiving body opposite to the end face 212, and the at least one temperature sensor 2142 is connected to the first controller and is used to collect the temperature of the battery cell 200.

[0076] The temperature sensor 2142 can be a sensor that converts temperature into an available output signal, including contact type and non-contact type temperature sensors 2142, and a thermal resistor or a thermocouple can be used as the temperature sensing element.

[0077] The number of temperature sensors 2142 can be determined according to actual requirements. When multiple temperature sensors 2142 are provided for the receiver 214, the temperature sensors 2142 can be arranged at positions close to the first electrode 2121 or the second electrode 2122. For example, Figure 4 in Figure 4 , the receiver 214 is provided with two temperature sensors 2142, one temperature sensor 2142 is close to the first electrode 2121, and the other temperature sensor 2142 is close to the second electrode 2122.

[0078] The first controller can be used to collect the output signals of the temperature sensors 2142, so that the battery management system can determine whether the battery cell 200 corresponding to the receiver 214 needs to be balanced according to the output signals of the temperature sensors 2142. In some feasible embodiments, the first controller can be a microcontroller unit (MCU).

[0079] In the embodiment of the present disclosure, by arranging the temperature sensors 2142 on the receiving body, accurate temperature detection is realized, providing data support for the determination of the battery cell 200 to be balanced.

[0080] In one embodiment, at least one heat insulation pad is provided between the receiving body and the end face 212 of the battery core close to the top cover 211, and the heat insulation pad is provided with mounting holes for accommodating the temperature sensors 2142.

[0081] The heat insulation pad can be a ceramic heat insulation pad made of high-temperature ceramic materials, or a fiber heat insulation pad made of fiber materials such as glass fiber and silica gel, or made of polycarbonate PC material. The present disclosure does not make specific limitations on this.

[0082] The size of the mounting hole is preferably such that it can accommodate the acquisition contacts of the temperature sensors 2142.

[0083] In the embodiment of the present disclosure, the heat insulation pad can physically isolate the receiver 214 from the surface of the end face 212, avoiding direct contact between the receiver 214 and the battery cell 200 and avoiding excessive heat generation of the receiver 214 resulting in high temperature of the battery cell 200; made of high-temperature resistant and corrosion-resistant materials, it can be fixed to the end face 212 by gluing. The heat insulation pad is provided with mounting holes, which can make the acquisition contacts of the temperature sensors 2142 directly contact the end face 212, improving the accuracy of temperature sampling.

[0084] In one embodiment, voltage sensors are connected to the first electrode 2121 and the second electrode 2122, and the voltage sensors are connected to the first controller for collecting the voltage of the battery cell 200.

[0085] The voltage sensor is a sensor that can convert the voltage of the battery cell 200 into an available output signal. In the present disclosure, a voltage-dividing element can be used as the sensing element of the voltage sensor to achieve voltage acquisition of the battery cell 200.

[0086] In the embodiments of the present disclosure, by setting a voltage sensor to collect the voltage of the battery cell 200, accurate voltage detection is achieved, providing data support for the determination of the battery cell 200 to be balanced.

[0087] It should be noted that in the present disclosure, a temperature sensor or a voltage sensor can be set separately, or a temperature sensor and a voltage sensor can be set simultaneously, and no specific limitation is made thereto.

[0088] In the present disclosure, for the wireless active balancing of the battery cell 200, a receiver 214 is installed between the positive and negative electrodes of each battery cell 200. The shape of the receiver 214 is fixed by the interference contact of pressing with the first electrode 2121 and the second electrode 2122 of the battery cell 200. During normal charging and discharging, the first controller does not work and is in a zero-power consumption state, and there is no sleep state.

[0089] Figure 5 The communication schematic diagram of a receiver 214 and a transmitter 213 provided by the embodiments of the present disclosure is shown. In one embodiment, as Figure 5 shown, the receiver 214 further includes a receiving coil 2143, a first resonant capacitor C1, and a first rectifier bridge 2144 connected in series.

[0090] The first rectifier bridge 2144 is electrically connected to the first electrode 2121 and the second electrode 2122. When the receiving coil 2143 is placed within the magnetic field range of the transmitter 213, according to the principle of electromagnetic induction, an induced current is generated in the receiving coil 2143, and the first rectifier bridge 2144 can convert the induced current from alternating current to direct current for charging the battery cell 200. The capacitance of the first resonant capacitor C1, the number of turns of the receiving coil 2143, etc. can be determined according to actual needs.

[0091] The first rectifier bridge 2144 can include at least one of a multi-pulse transformer rectifier and an autotransformer multi-pulse transformer rectifier.

[0092] In the present disclosure, the induced current passes through the surface of the copper foil (or other conductive materials) in direct contact with the first electrode 2121 and the second electrode 2122 to form a charging circuit; the first controller of the receiver 214 forms a charging voltage through the receiving coil 2143 and the first rectifier bridge 2144 to charge the battery cell 200.

[0093] In one embodiment, the transmitter 213 is pasted on the inner wall of the top cover 211, and / or an installation groove for accommodating the transmitter 213 is provided on the inner wall of the top cover 211.

[0094] The top cover 211 can be made of a material with good heat conduction performance. For example, copper or silver can be plated on the inner surface of the top cover 211 to ensure good heat dissipation of the emitter 213 and improve the reliability of the emitter 213.

[0095] For example, the emitter 213 can be fixed to the inner wall of the top cover 211 by gluing; an installation groove can also be provided on the inner wall of the top cover 211, and the emitter 213 is fixed by interference fit with the installation groove; glue can also be filled in the installation groove, and the emitter 213 is fixed to the top cover 211 by gluing and grooving, so as to simply and conveniently fix the emitter 213.

[0096] Continue to refer to Figures 2 to 3 , in one embodiment, the emitter 213 is provided with a power pin 2131 connected to an external balancing power supply, and the side wall of the top cover 211 is provided with an insertion interface 2111 corresponding to the power pin 2131. The power pin 2131 passes through the insertion interface 2111 to expose the power pin 2131; a plug 215 is movably connected to the power pin 2131.

[0097] The plug 215 can be made of a material with deformation such as rubber or plastic. The balancing power supply can be an AC power supply, such as mains power.

[0098] There are two insertion interfaces 2111, which respectively correspond to the positive and negative poles of the external balancing power supply. The insertion interfaces 2111 can be provided on the two side walls where the short sides of the top cover 211 are located.

[0099] In the embodiment of the present disclosure, when the battery cell 200 does not need to use wireless balancing, the power pin 2131 of the emitter 213 is blocked by the plug 215 to protect the emitter 213 and improve the reliability of the system.

[0100] Continue to refer to Figure 5 , in one embodiment, the emitter 213 includes a transmitting coil 2132, a second resonant capacitor, an inverter circuit 2133, a chopper circuit 2134, a second rectifier bridge 2135 and an external balancing power supply connected in series; the emitter 213 further includes a second controller for communicating with the battery management system, and the second controller performs wireless communication with the first controller in the receiver 214.

[0101] The second rectifier bridge 2135 can include at least one of a multi-pulse transformer rectifier and an autotransformer multi-pulse transformer rectifier.

[0102] The number of turns of the transmitting coil 2132 and the capacitance of the second resonant capacitor C2 can be determined according to actual requirements. The number of turns of the transmitting coil 2132 affects the balancing current or the charging current of the battery cell 200. The magnitude of the balancing current can be set according to the space of the top cover 211 and product requirements, and is related to the size, shape, material, and layout of the transmitting coil 2132, etc.

[0103] The second resonant capacitor C2 is a circuit component, which can be composed of a capacitor and an inductor in parallel. When the capacitor discharges, the inductor starts to have a reverse recoil current, and the inductor charges. When the voltage of the inductor reaches the maximum, the capacitor finishes discharging. After that, the inductor starts to discharge and the capacitor starts to charge, and so on, which is called resonance. During this process, the inductor continuously charges and discharges to generate electromagnetic waves.

[0104] The inverter circuit 2133 can convert direct current into alternating current. The inverter circuit 2133 can include a voltage-source inverter circuit 2133 and a current-source inverter circuit 2133, which can be determined according to actual situations. The present disclosure does not make specific limitations on the selection of the inverter circuit 2133.

[0105] The chopper circuit 2134 can convert a DC voltage or current into a required DC voltage or current. By utilizing the characteristic that the switching tube quickly switches between the on and off states, the effective value and frequency of the input power signal can be adjusted to achieve the control of the output signal. The chopper circuit 2134 can include, but is not limited to, a buck chopper circuit 2134, a boost chopper circuit 2134, a buck-boost chopper circuit 2134, a Cuk chopper circuit 2134, etc. The present disclosure does not make specific limitations on the selection of the chopper circuit 2134.

[0106] Multiple functional circuits can be integrated in the transmitter 213. The second controller can be an MCU. The second controller communicates with the first controller wirelessly. For example, Bluetooth, WiFi, etc. can be used. The first controller can send the detected temperature and / or voltage of the battery cell 200 to the second controller, and the second controller can perform actions according to the temperature and / or voltage of the battery cell 200 and the preset strategy.

[0107] For example, if the voltage of the battery cell 200 is lower than the voltages of the other battery cells 200 and the voltage difference is greater than or equal to the preset voltage threshold, then it is determined that the battery cell 200 is the battery cell 200 to be balanced; if the temperature of the battery cell 200 is lower than the temperatures of the other battery cells 200 and the temperature difference is greater than or equal to the preset threshold, then the battery cell 200 to be balanced among the multiple battery cells 200 is determined.

[0108] In one embodiment, the transmitter 213 further includes a control switch connected in series. The control switch is connected to the second controller, and the control switch may include, but is not limited to, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET or MOS tube), a bipolar junction transistor, etc.

[0109] The transmitting coil 2132 is connected to a phase-locked loop. The phase-locked loop (PLL) uses the voltage generated by phase synchronization to tune a voltage-controlled oscillator to generate a negative feedback control signal with a target frequency, so that the second controller adjusts the current magnitude of the transmitting coil 2132 according to the negative feedback control signal, thereby adjusting the magnetic field strength and range.

[0110] In the embodiment of the present disclosure, when an external balancing power supply is turned on, a current passes through the transmitting coil 2132 to generate an alternating magnetic field, and an induced current is generated in the receiving coil 2143 to charge the battery cell 200. The transmitter 213 can convert electrical energy into magnetic energy; the alternating current (or mains power) is connected to the second controller through the power supply pin 2131, and through rectification - filtering - inversion - it reaches the transmitting coil 2132 to generate an alternating magnetic field.

[0111] In one embodiment, the receiver 214 can be used as an acquisition module to acquire the temperature or voltage of the battery cell 200, and transmit the acquired temperature or voltage to the BMS main control through the second controller. The BMS main control determines which specific battery cell 200 needs to be balanced according to the temperature or voltage of each battery cell 200 received, that is, turns on its corresponding transmitter 213 for wireless charging to achieve balancing.

[0112] In another embodiment, logic can be set inside each battery cell 200 to turn on the corresponding transmitter 213 (second controller) to achieve balancing when the voltage or temperature reaches the set value.

[0113] In the present disclosure, a wireless charging loop is formed by the transmitter 213 and the receiver 214. The transmitter 213 includes a transmitting coil 2132 and a power amplifier loop composed of an inverter circuit 2133, a chopper circuit 2134, a second rectifier bridge 2135, etc. When an external balancing power supply is turned on, a current passes through the transmitting coil 2132 to generate an alternating magnetic field. The power amplifier can increase the intensity of the current, thereby enhancing the magnetic field strength and range. The receiver 214 includes a receiving coil 2143 and a first rectifier bridge 2144. When the receiving coil 2143 is placed within the magnetic field range of the transmitter 213, according to the principle of electromagnetic induction, an induced current is generated in the receiving coil 2143, and the first rectifier bridge 2144 can convert the induced current from alternating current to direct current to charge the battery cell 200.

[0114] Through wireless communication between the transmitter 213 and the receiver 214, the first controller feeds back the detected temperature and voltage to the second controller, and the second controller can perform corresponding actions according to the preset strategy.

[0115] In the present disclosure, it is not necessary to remove the battery cell 200 from the battery pack, and balancing can be achieved as long as the plug 215 is opened; there is no need to additionally increase the balancing wire harness, eliminating the problem of wire harness balancing heat generation; the magnitude of the balancing current can be designed according to the capacity of the battery cell 200, enabling large-current and rapid balancing; there is no wire harness connection relationship during the balancing process, and only the program of the second controller needs to be set for automatic operation. When the housing is thin enough, the cavity between the outer shell 218 and the top cover 211 is relatively small. At this time, the transmitter 213 can be close to the receiver 214, so that the receiver 214 is always within the magnetic field range of the transmitter 213 to achieve balancing.

[0116] The present disclosure can improve the balancing efficiency, reduce the balancing wire harness, reduce the heat generation risk, improve safety, increase the overall service life of the system, reduce after-sales costs, and enhance the user experience.

[0117] Based on this, the embodiment of the present disclosure further provides a battery module 300 as described in the following embodiments. Since the principle of solving problems in this device embodiment is similar to that of the above battery cell 200 embodiment, the implementation of this battery module 300 embodiment can refer to the implementation of the above battery cell 200 embodiment, and the repeated parts will not be described again.

[0118] As Figure 6 shown, the embodiment of the present disclosure further provides a battery module 300, which includes a plurality of conductive structures and a plurality of battery cells 200 in the above embodiments, and adjacent battery cells 200 are electrically connected through a conductive structure. In this way, combined with the above battery cells 200, the safety of the system can be improved, and the applicable range of the battery module 300 is wider.

[0119] In Figure 6 only a perspective view of two battery cells 200 connected in series to form a battery module 300 is shown. It should be noted that the number of battery cells 200 in the battery module 300 can be determined according to actual needs, and the present disclosure does not make specific limitations.

[0120] Taking the first battery cell 200 and the second battery cell 200 as two adjacent battery cells 200 as an example, the first battery cell 200 and the second battery cell 200 can be combined with one of their side walls in close contact to form a battery module 300. When arranged side by side, the first electrode 2121 of the first battery cell 200 and the second electrode 2122 of the second battery cell 200 are connected through a conductive structure, thereby realizing the series connection of the first battery cell 200 and the second battery cell 200. A conductive structure includes a conductive busbar 216 and a mother busbar 217.

[0121] As Figures 6 - 7 shown, in one embodiment, the conductive busbar 216 passes through the side wall of the top cover 211 of the first battery cell 200 and is electrically connected to the first electrode 2121 of the first battery cell 200, and the conductive busbar 216 passes through the side wall of the top cover 211 of the second battery cell 200 and is electrically connected to the second electrode 2122 of the second battery cell 200.

[0122] Avoidance holes 2112 can be respectively provided on the side wall of the top cover 211 of the first battery cell 200 and the side wall of the top cover 211 of the second battery cell 200. The receiver 214 corresponding to the avoidance hole 2112 in the first battery cell 200 is provided with a socket hole, and the receiver 214 corresponding to the avoidance hole 2112 in the second battery cell 200 is provided with a mother busbar 217. One end of the conductive busbar 216 passes through the avoidance hole 2112 and the socket hole and is electrically connected to the first electrode 2121 of the first battery cell 200, and the other end of the conductive busbar 216 passes through the avoidance hole 2112 and is electrically connected to the mother busbar 217.

[0123] Among them, one end of the conductive busbar 216 can be fixedly connected to the first electrode 2121 of the first battery cell 200, and the mother busbar 217 is arranged on the receiver 214 in the second battery cell 200. By inserting the conductive busbar 216 into the mother busbar 217, the series connection of adjacent battery cells 200 is realized.

[0124] The shape of the avoidance hole 2112 can be rectangular, and the avoidance hole 2112 can penetrate the cavity opening of the top cover 211.

[0125] The integrated mother busbar 217 (Cells Contact System, CCS component), also known as the battery cover plate component, the wire harness board integrated component, etc., the CCS component is mainly composed of a signal acquisition component (for example, a flexible circuit board FPC, a printed circuit board PCB, an FFC, etc.), a plastic structural component, a copper-aluminum busbar, etc. Through a hot pressing process, the above components are connected into a whole to realize the series-parallel connection of battery cells and collect temperature and voltage, that is, using a flexible circuit board FPC or a printed circuit board PCB to replace the wire harness connection method.

[0126] In the embodiments of the present disclosure, the series connection of adjacent battery cells 200 is achieved through the busbar 216 and the main busbar 217, thereby improving the production efficiency of the battery module 300 and realizing modular production.

[0127] It should be noted that although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of the two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0128] In addition, although the steps of the methods in the present disclosure are described in a specific order in the drawings, this does not require or imply that these steps must be executed in that specific order, or that all the steps shown must be executed to achieve the desired result. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step for execution, and / or one step may be decomposed into multiple steps for execution, etc.

[0129] Through the description of the above embodiments, those skilled in the art can easily understand that the exemplary embodiments described herein can be implemented by software, or by a combination of software and necessary hardware. Therefore, the technical solutions according to the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (such as a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the methods according to the embodiments of the present disclosure.

[0130] After considering the specification and practicing the disclosed embodiments herein, those skilled in the art will readily conceive of other implementations of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed herein. The specification and embodiments are only to be considered as exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

Claims

1. A battery cell, characterized in that: include: A shell, and a battery cell placed in the shell; wherein the battery cell further comprises: A top cover having a cavity, wherein the top cover is connected to the shell to cover the cavity; A transmitter placed in the cavity, the transmitter is fixed to the inner wall of the top cover, and the transmitter is connected to an external balancing power supply when balancing is required; A receiver is placed in the cavity, the receiver is fixed to the end surface of the battery cell close to the top cover and is electrically connected to the first electrode and the second electrode of the battery cell, and the receiver is arranged corresponding to the transmitter and is connected through magnetic induction.

2. The battery cell according to claim 1, characterized in that: The receiver comprises a receiving body, and two connecting holes are arranged on the receiving body. The inner walls of the two connecting holes are both provided with conductive materials, and the two connecting holes are respectively interference-fitted with the first electrode and the second electrode.

3. The battery cell according to claim 2, characterized in that: The receiver also includes a first controller disposed on the receiving body; At least one temperature sensor is provided on the receiving body opposite to the end surface, and the at least one temperature sensor is connected to the first controller and is used to collect the temperature of the battery cell; and / or The first electrode and the second electrode are connected to voltage sensors, and the voltage sensors are connected to the first controller.

4. The battery cell according to claim 3, characterized in that: At least one heat-insulating pad is arranged between the receiving body and the end surface of the battery cell close to the top cover, and the at least one heat-insulating pad is provided with a mounting hole for accommodating the temperature sensor.

5. The battery cell according to claim 1, characterized in that: The receiver further includes a receiving coil, a first resonant capacitor and a first rectifier bridge connected in series.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The transmitter is adhered to the inner wall of the top cover, and / or the inner wall of the top cover is provided with a mounting groove for accommodating the transmitter.

7. The battery cell according to claim 6, characterized in that: The transmitter is provided with a power pin connected to the external balanced power supply, the side wall of the top cover is provided with a plug interface corresponding to the power pin, and the power pin passes through the plug interface to expose the power pin; The power pin is movably connected with a plug.

8. The battery cell according to any one of claims 1 to 5, characterized in that: The transmitter includes a transmitting coil, a second resonant capacitor, an inverter circuit, a chopper circuit, a second rectifier bridge and the external balancing power supply connected in series; The transmitter also includes a second controller that wirelessly communicates with the first controller within the receiver.

9. The battery cell according to any one of claims 1 to 5, characterized in that: The distance between the center point of the receiver and the center point of the transmitter is no more than 10 cm.

10. A battery module, characterized in that: The invention comprises a plurality of conductive structures and a plurality of battery cells according to any one of claims 1 to 9, wherein adjacent battery cells are connected in series via one of the conductive structures.

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