WO2023010798A1

WO2023010798A1 - Battery cell, battery module, battery pack and electric vehicle

Info

Publication number: WO2023010798A1
Application number: PCT/CN2021/143897
Authority: WO
Inventors: 陈斌斌; 雷晶晶; 郑娅敏; 廖思航
Original assignee: 欣旺达电动汽车电池有限公司
Priority date: 2020-09-29
Filing date: 2021-12-31
Publication date: 2023-02-09
Also published as: CN215451516U; CN113594562A; CN216213662U; CN215451515U; CN113471555A; CN112201866A; CN113594562B; CN215451513U; CN215451514U; CN113471555B; CN113300010B; CN113300010A; CN113675485A

Abstract

Disclosed in the present application are a battery cell, a battery module, a battery pack and an electric vehicle. The battery cell comprises: a housing, which is provided with at least one opening; a cover plate, which is arranged at an open end of the housing and seals the open end of the housing; a wound cell, which is arranged inside the housing and comprises a positive plate, a negative plate, a positive tab and a negative tab, wherein the positive plate is connected to the positive tab, and the negative plate is connected to the negative tab; a positive terminal and a negative terminal, which are respectively arranged on the cover plate, wherein the positive terminal is connected to the positive tab, and the negative terminal is connected to the negative tab; and a collection circuit, which is arranged inside the housing, comprises at least one chip, and is used for collecting working parameters of the wound cell. By means of the embodiments of the present application, the working parameters of a battery cell can be collected, thereby avoiding the effect on the battery module, etc. due to overlooking or omitting the working state of certain battery cells.

Description

Cells, battery modules, battery packs and electric vehicles

technical field

The present application relates to the technical field of battery cells, and in particular to a battery cell, a battery module, a battery pack and an electric vehicle.

Background technique

Currently, a battery module includes at least two single cells.

In related technologies, the battery management system needs to collect data from the battery module, so as to perform operations such as charging, discharging, and safety protection on the battery module according to the collected data. However, the data collected by the above operations cannot completely cover the data of all cells in the battery module, making the working status of some uncollected single cells easy to be ignored, thus affecting the battery module, battery management system and affect the security of external devices.

Contents of the invention

This application aims to solve at least one of the technical problems existing in the prior art. For this reason, this application proposes a battery cell, a battery module, a battery pack and an electric vehicle, which can collect the working parameters of the battery cell, thereby avoiding the failure of the battery module due to the neglect of the working status of some single cells group, etc.

The electric core according to the embodiment of the first aspect of the present application includes: a housing provided with at least one opening; a cover plate arranged at the opening end of the housing and encapsulating the opening end of the housing; a winding core, Set inside the casing, the winding core includes a positive pole piece, a negative pole piece, a positive pole lug and a negative pole lug, the positive pole piece is connected to the positive pole lug, the negative pole piece is connected to the negative pole lug; the positive pole and The negative pole, the positive pole and the negative pole are respectively arranged on the cover plate, the positive pole is connected to the positive ear, and the negative pole is connected to the negative ear; the acquisition circuit is arranged on the Inside the casing, the collection circuit includes at least one chip, and the collection circuit is used to collect the working parameters of the winding core.

The cell according to the embodiment of the present application has at least the following beneficial effects: through the acquisition circuit, operations such as collecting operating parameters of the cell are performed, thereby realizing the detection of the working state of the single cell, and avoiding the The status is ignored and the impact on the battery module and so on.

According to some embodiments of the present application, the collection circuit includes: a collection module, configured to collect working parameters of the winding core; a main control module, connected to the collection module, used to generate a control signal according to the working parameters; A communication module, connected to the main control module, used to send the working parameters to external devices according to the control signal, and/or the communication module is used to receive external signals; wherein, the main control module also uses The working state of the winding core is controlled according to the external signal; the acquisition module, the main control module and the communication module are arranged on the same circuit board.

According to some embodiments of the present application, the acquisition module includes: an electrical signal acquisition module, the electrical signal acquisition module is respectively connected to the winding core and the main control module, and the electrical signal acquisition module is used to acquire the At least one of voltage parameters, current parameters, and power parameters of the winding core.

According to some embodiments of the present application, the winding core further includes a first collection tab, the first collection tab is connected to the positive plate; one end of the electrical signal collection module is connected to the first collection tab connected, the other end of the electrical signal acquisition module is connected to the negative pole or the negative tab; and/or, the winding core also includes a second collection tab, the second collection tab is connected to the negative pole chip connection; one end of the electrical signal acquisition module is connected to the second acquisition tab, and the other end of the electrical signal acquisition module is connected to the positive column or the positive tab.

According to some embodiments of the present application, it further includes: a first connecting piece, the first connecting piece is arranged inside the housing, one end of the first connecting piece is connected to the positive tab, and the first connecting piece The other end of the component is connected to the electrical signal acquisition module; wherein, the electrical signal acquisition module is connected to the negative pole or the negative ear; and/or, the second connector, the second connector is arranged on Inside the housing, one end of the second connector is connected to the negative tab, and the other end of the second connector is connected to the electrical signal acquisition module; wherein, the electrical signal acquisition module is connected to the The positive post or the positive lug connection.

According to some embodiments of the present application, the collection module further includes: a temperature collection module connected to the main control module, and the temperature collection module is used to collect temperature parameters of the winding core; wherein, The temperature acquisition module is used to connect with the positive pole and/or the negative pole.

According to some embodiments of the present application, the collection module further includes: a temperature collection module connected to the main control module, and the temperature collection module is used to collect temperature parameters of the winding core; wherein, The temperature collection module is used to connect with the first collection tab and/or the second collection tab.

According to some embodiments of the present application, the collection module further includes: a temperature collection module connected to the main control module, the temperature collection module is used to collect temperature parameters of the winding core; The winding core also includes a diaphragm, and the diaphragm is arranged between the positive electrode sheet and the negative electrode sheet; the battery core also includes at least one temperature collecting film, and at least one temperature collecting film is arranged between the diaphragm and the negative electrode sheet. Between the positive electrodes, or at least one temperature-collecting film is arranged between the diaphragm and the negative electrode; wherein, the temperature collection module is used to connect with the temperature-collecting film.

According to some embodiments of the present application, it also includes: an infrared emitting module and an infrared receiving module; the infrared emitting module is arranged inside the housing, and the infrared emitting module is used to emit infrared signals to the core; the An infrared receiving module is arranged inside the housing, and the infrared receiving module is used to receive the reflected signal of the infrared signal; the acquisition module also includes: a temperature acquisition module, the temperature acquisition module is connected to the main control module , the temperature acquisition module is used to connect with the infrared receiving module, the temperature acquisition module is used to calibrate the reflected signal and generate the temperature parameter of the winding core.

According to some embodiments of the present application, it also includes: an explosion-proof valve, the explosion-proof valve is arranged on the cover plate; the acquisition module further includes: a pressure acquisition module, the pressure acquisition module is connected to the explosion-proof valve, the The main control module is connected, and the pressure collection module is used to collect the pressure parameters of the winding core.

According to some embodiments of the present application, the cover plate is provided with a through hole; the battery core further includes: a storage cavity and a sealing member, the storage cavity is provided with an opening, and the opening end of the storage cavity is covered on In the circumferential direction of the through hole, the seal is used to seal the through hole; the acquisition module also includes: a pressure acquisition module, the pressure acquisition module is connected to the main control module, and the pressure acquisition module is used for for collecting pressure parameters of the core.

According to some embodiments of the present application, the sealing member is made of a piezoelectric material; wherein, the pressure acquisition module is connected to the sealing member.

According to some embodiments of the present application, the acquisition circuit further includes: an equalization module, one end of the equalization module is connected to the main control module, and the other end of the equalization module is respectively connected to the positive ear and the negative ear. connection; or, one end of the balance module is connected to the main control module, and the other end of the balance module is respectively connected to the positive pole and the negative pole; wherein, the balance module is used to control The signal performs an equalization operation on the winding core; and/or, the main control module is used to control the equalization module to perform an equalization operation according to the external signal.

According to some embodiments of the present application, the equalization module includes: an equalization resistor, one end of which is connected to the positive ear or the positive pole; a controllable switch, whose controllable end is connected to the positive pole connected to the main control module, and the controllable switch is also connected to the other end of the equalization resistor and the negative ear; or, the controllable end of the controllable switch is connected to the main control module, and the controllable The controllable switch is also connected to the other end of the balancing resistor and the negative pole respectively; wherein, the controllable switch is used to turn on or off according to the control signal; and/or, the main control module is used to The controllable switch is controlled to be turned on or off according to the external signal.

According to some embodiments of the present application, the controllable switch includes any one of an electronic switch, a MOS tube, and a transistor.

According to some embodiments of the present application, the acquisition circuit further includes: an internal resistance detection module, one end of the internal resistance detection module is connected to the main control module, and the other end of the internal resistance detection module is respectively connected to the positive electrode ear, the negative ear is connected; or, one end of the internal resistance detection module is connected to the main control module, and the other end of the internal resistance detection module is connected to the positive pole and the negative pole respectively; The internal resistance detection module is used to detect the voltage change parameter of the winding core; wherein, the main control module is used to obtain the internal resistance parameter of the winding core according to the voltage change parameter.

According to some embodiments of the present application, the internal resistance detection module includes: a signal generating unit connected to the positive tab and the main control module respectively; the signal generating unit is used to generate Excitation signal; detection resistor, one end of the detection resistor is connected to the signal generation unit, and the other end of the detection resistor is connected to the negative ear; an analog-to-digital conversion unit, the analog-to-digital conversion unit is respectively connected to the positive electrode The ear, the detection resistor, and the main control module are connected, and the analog-to-digital conversion unit is used to detect the voltage change parameter of the winding core according to the excitation signal.

According to some embodiments of the present application, the acquisition circuit further includes: a power protection module, one end of the power protection module is used to connect to an external power supply, and the other end of the power protection module is connected to the main control module.

According to some embodiments of the present application, the power supply protection module includes: a power isolation unit, one end of the power isolation unit is used to connect to an external power supply; an electrical signal conversion unit, one end of the electrical signal conversion unit is connected to the power supply The other end of the isolation unit is connected, the other end of the electrical signal conversion unit is connected to the main control module, and the electrical signal conversion unit is used for converting the power supply signal provided by the external power supply.

According to some embodiments of the present application, the communication module includes: a first communication unit, the first communication unit includes an isolation subunit, one end of the isolation subunit is connected to the main control module, and the isolation subunit The other end is used to connect with the external device.

According to some embodiments of the present application, the communication module includes: a second communication unit configured to connect to the external device through at least one of Bluetooth communication, radio frequency communication, and Wi-Fi communication .

The battery module according to the second embodiment of the present application includes: a plurality of battery cells as described in any one of the above embodiments.

The battery module according to the embodiment of the present application has at least the following beneficial effects: the working parameters of each battery cell in the battery module can be obtained, thereby avoiding damage to the battery due to ignoring the working state of a certain battery cell. The impact of mods.

The battery pack according to the third embodiment of the present application includes: at least one battery module as described in the above embodiments; a battery management system connected to the communication module of at least one battery cell.

The battery pack according to the embodiment of the present application has at least the following beneficial effects: the battery management system obtains the working parameters of each battery cell in the battery module through the communication module, thereby realizing the detection of the working state of each battery cell, thereby avoiding the The impact on the battery pack due to the neglect of the working state of a certain battery cell.

The electric vehicle according to the embodiment of the fourth aspect of the present application includes at least one battery pack as described in the above embodiment.

The electric vehicle according to the embodiment of the present application has at least the following beneficial effects: the battery management system obtains the working parameters of each battery cell in the battery module through the communication module, thereby realizing the detection of the working state of each battery cell, thereby avoiding the The impact on the battery pack and electric vehicles caused by the neglect of the working state of a certain battery cell.

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

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present application is described further, wherein:

Fig. 1 is a structural schematic diagram of the cell of the embodiment of the present application;

Fig. 2 is a module block diagram of the acquisition circuit of the embodiment of the present application;

Fig. 3 is a schematic diagram of a circuit structure of the acquisition circuit of the embodiment of the present application;

Fig. 4 is another module block diagram of the acquisition circuit of the embodiment of the present application;

Fig. 5 is another structural schematic diagram of the cell of the embodiment of the present application;

Fig. 6 is another structural schematic diagram of the cell of the embodiment of the present application;

FIG. 7 is another structural schematic diagram of the battery cell of the embodiment of the present application.

Reference signs:

Cell 100, shell 101, cover plate 102, winding core 103, positive pole 104, negative pole 105, acquisition circuit 106, opening 107, positive pole ear 108, negative pole ear 109, acquisition module 110, main control module 111, communication module 112, external equipment 113, electrical signal acquisition module 114, first acquisition tab 115, temperature acquisition module 116, temperature acquisition film 117, explosion-proof valve 118, pressure acquisition module 119, through hole 120, accommodation cavity 121, seal 122, An internal resistance detection module 123 , an equalization module 124 , a power protection module 125 , and an external power supply 126 .

Detailed ways

Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are only for explaining the present application, and should not be construed as limiting the present application.

In the description of the present application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only In order to facilitate the description of the present application and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, several means more than one, and multiple means more than two. Greater than, less than, exceeding, etc. are understood as not including the original number, and above, below, within, etc. are understood as including the original number. If the description of the first and second is only for the purpose of distinguishing the technical features, it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features relation.

In the description of this application, unless otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in this application in combination with the specific content of the technical solution.

In the description of this application, reference to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" is intended to mean that the embodiments Specific features, structures, materials, or characteristics described in or examples are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to FIG. 1 , an embodiment of the present application provides a battery cell 100 . The cell 100 includes a casing 101 , a cover plate 102 , a winding core 103 , a positive pole 104 , a negative pole 105 and an acquisition circuit 106 . Wherein, the casing 101 is provided with at least one opening 107 , and the cover plate 102 is disposed on the opening end of the casing 101 and encapsulates the opening end of the casing 101 . The winding core 103 is disposed inside the casing 101 , and the winding core 103 includes a positive electrode sheet, a negative electrode sheet, a positive electrode ear 108 and a negative electrode ear 109 , the positive electrode sheet is connected to the positive electrode ear 108 , and the negative electrode sheet is connected to the negative electrode ear 109 . The positive post 104 and the negative post 105 are respectively arranged on the cover plate 102 , the positive post 104 is connected to the positive tab 108 , and the negative post 105 is connected to the negative tab 109 . The collection circuit 106 is arranged inside the casing 101 , and the collection circuit 106 includes at least one chip, and the collection circuit 106 is used to collect the working parameters of the winding core 103 .

Specifically, at least one chip is integrated on the PCB board (or FPC board) according to the type of working parameters of the collected winding core 103, for example: the working parameters include temperature parameters and pressure parameters, then the temperature sensor and the pressure sensor can be integrated On the same PCB board, to form the acquisition circuit 106; or the acquisition circuit 106 is made up of an integrated chip, connecting wire harness and other components and parts (resistance, inductance etc.), wherein, this integrated chip can realize the different types of operating parameters collection. The acquisition circuit 106 is arranged at any position inside the housing 101, and the acquisition circuit 106 is used to perform operations such as collecting working parameters on the winding core 103, so as to realize the detection of the working state of the single battery cell 100, and avoid the The impact on the battery module and the like caused by neglecting the working state of the core 100 is ignored.

Referring to FIG. 2 , in some embodiments, the collection circuit 106 includes a collection module 110 , a main control module 111 and a communication module 112 . The acquisition module 110 is used to collect the working parameters of the winding core; the main control module 111 is connected with the collection module 110 for generating control signals according to the working parameters; the communication module 112 is connected with the main control module 111 for sending the working parameters according to the control signals to external devices, and/or the communication module 112 is used to receive external signals. Wherein, the main control module 111 is also used to control the working state of the winding core according to the external signal. Specifically, when the acquisition circuit 106 is integrated on the PCB (or FPC board) by at least one chip, the acquisition module 110, the main control module 111 and the communication module 112 can be the components on the PCB (or FPC board) respectively. An independent chip; when the acquisition circuit 106 was an integrated chip, the acquisition module 110, the main control module 111 and the communication module 112 were composed of different pins on the integrated chip and components (resistance, inductance, etc.) connected to the pins. )composition. External equipment includes BMS (Battery Management System, battery management system) and other equipment used to manage and maintain single cells and battery modules. The main control module 111 is used to process the working parameters collected by the collection module 110, and send the processed working parameters to the external device through the communication module 112, so that the external device can control the operation parameters of the corresponding single cell according to the working parameters. Judging the working status, so as to avoid the harm caused by ignoring the working status of the single cell.

Wherein, the main control module 111 is also used to receive an external signal from an external device through the communication module 112 , and the main control module 111 controls the charging and discharging of the corresponding single cell according to the external signal. Or the main control module 111 judges the processed working parameters according to the preset working strategy, and controls the working state of the corresponding single battery cell according to the judgment result, so as to ensure the safety of the single battery cell. It can be understood that, the connection manner between the communication module 112 and the external device includes at least one of wired connection and wireless connection, which is not specifically limited in this embodiment of the present application.

For example, referring to FIG. 3 , in some embodiments, the communication module 112 includes a first communication unit and/or a second communication unit. The first communication unit includes an isolation subunit, one end of the isolation subunit is connected to the main control module 111 , and the other end of the isolation subunit is used to connect to the external device 113 . The second communication unit is configured to connect with the external device 113 through at least one of Bluetooth communication, radio frequency communication, and Wi-Fi communication. Specifically, the communication mode between the battery cell and the external device 113 includes at least one of wired communication and wireless communication. When the communication mode includes wired communication, the first communication unit includes an isolation subunit to prevent signal interference. When the communication method includes wireless communication, at least one of wireless communication methods such as Bluetooth communication, radio frequency communication, and Wi-Fi communication can be selected for signal transmission.

In some embodiments, the working parameters collected by the collection circuit include at least one of electrical signal parameters, temperature parameters, pressure parameters, and internal resistance parameters. Hereinafter, the collection of these four working parameters will be described in detail in combination with the features described in the above embodiments.

First, the acquisition of electrical signal parameters will be described in detail. It can be understood that when the acquisition circuit is integrated by at least one chip on the PCB board, the electrical signal acquisition module can be an independent chip on the PCB board (or FPC board); when the acquisition circuit is an integrated chip, The electrical signal acquisition module is composed of multiple pins on the integrated chip and components connected to the pins.

Referring to FIG. 3 and FIG. 4 , in some embodiments, the acquisition module 110 includes an electrical signal acquisition module 114 . The electrical signal acquisition module 114 is respectively connected with the winding core 103 and the main control module 111 , and the electrical signal acquisition module 114 is used for collecting electrical signal parameters of the winding core 103 . Specifically, the electrical signal parameters include at least one of a voltage parameter (V), a current parameter (I), and a power parameter (P). The collection end of the electrical signal collection module 114 is attached to the winding core 103 to form an electrical connection loop, so as to collect at least one of the voltage, current and power of the loop. The electrical signal acquisition module 114 is also connected to the main control module 111. The electrical signal acquisition module 114 performs analog-to-digital conversion processing on the collected electrical signal parameters, and the main control module 111 judges the electrical signal parameters after the analog-to-digital conversion, or converts the analog The electrical signal parameters after digital conversion are sent to the external device 113 through the communication module 112, so as to realize the electrical signal detection of the single battery cell. It can be understood that, in the embodiments of the present application and the summary of the following embodiments, the acquisition end includes pins of corresponding chips, and wire harnesses connected to the pins, and the like.

For example, referring to FIG. 3 and FIG. 5 , in addition to the positive tab 108 and the negative tab 109, the winding core 103 also includes a first collection tab 115 disposed on the positive sheet, and/or a second collection tab disposed on the negative sheet ( not shown in the figure). When the winding core 103 includes the first collection tab 115, one end of the electrical signal collection module 114 is connected to the first collection tab 115, and the other end of the electrical signal collection module 114 is connected to the negative pole 105 or the negative pole tab, thereby forming a second An electrical connection circuit of the collection tab 115, the electrical signal collection module 114, and the negative plate (or the negative tab 109). When the winding core 103 includes the second collection tab, one end of the electrical signal acquisition module 114 is connected to the second tab, and the other end of the electrical signal acquisition module 114 is connected to the positive pole 104 or the positive pole piece, thereby forming the positive pole piece (or positive pole column 104), the electrical signal acquisition module 114, and the electrical connection circuit of the second acquisition tab.

Alternatively, the battery cell 100 further includes a first connector and/or a second connector, the first connector and the second connector are any one of a wire harness, a PCB board, and an FPC board, and the first connector and the second connector The components are used to connect the electrical signal acquisition module 114 and the winding core, so that the electrical signal acquisition module 114 and the winding core form an electrical connection loop. Specifically, both the first connecting element and the second connecting element are disposed inside the housing 101 , for example, disposed on a connection surface between the cover plate 102 and the housing 101 . Wherein, one end of the first connector is connected with the positive pole ear 108, the other end of the first connector is connected with the electrical signal acquisition module 114, and the electrical signal acquisition module 114 is connected with the negative pole column 105 or the negative pole ear 109; Connect to the negative pole ear 109, the other end of the second connector is connected to the electrical signal acquisition module 114, the electrical signal acquisition module 114 is connected to the positive pole 104 or the positive pole ear 108, so that the electrical signal acquisition module 114 can pass through the first connector and/or Or the second connecting piece realizes the electrical signal collection of the winding core.

Secondly, the collection of temperature parameters is described in detail. It can be understood that when the acquisition circuit is integrated by at least one chip on the PCB, the temperature acquisition module can be an independent chip on the PCB; when the acquisition circuit is an integrated chip, the temperature acquisition module consists of the integrated It consists of multiple pins on the chip and the components connected to the pins.

Referring to FIG. 4 , in some embodiments, the collection module 110 further includes a temperature collection module 116 . The temperature collection module 116 is connected with the main control module 111, and the temperature collection module 116 is used to collect temperature parameters of the winding core. Wherein, the temperature acquisition module 116 is used to connect with the positive pole and/or the negative pole of the winding core. Specifically, the collection end of the temperature collection module 116 is attached to the positive pole and/or the negative pole of the winding core, so as to collect the temperature parameters of the winding core. The main control module 111 and/or the external device 113 judge whether the charging current of the battery cell is too large, the electrolyte solution is reduced, the ambient temperature is too high, etc. according to the temperature parameter. When the above situation occurs in the battery cell, the main control module 111 will actively disconnect the power supply line of the winding core according to the external signal sent by the external device 113 and/or the main control module 111, so as to suspend the work of the battery cell, so as to ensure that the battery cell and the external environment safety.

In some embodiments, the first collection tab and the second collection tab can also be used to connect with the temperature collection module 116 in addition to being connected to the electrical signal collection module 110, that is, the first collection tab and the second collection tab The tab can be used as a medium for electrical signal collection and/or temperature collection. It can be understood that the lengths of the first collection tab and the second collection tab may be greater than, or less than, or equal to the length of the positive tab, and the lengths of the positive tab and the negative tab may be equal or unequal. Not specifically limited.

Referring to Fig. 6, in some embodiments, a separator (not shown) is provided between the positive electrode sheet and the negative electrode sheet of the winding core 103, and the separator is used to separate the positive electrode sheet from the negative electrode sheet to prevent the positive electrode sheet and the negative electrode sheet from contact and cause the winding core 103 to short circuit. The battery cell 100 also includes at least one temperature-collecting film 117, and at least one temperature-collecting film 117 is arranged between the separator and the positive electrode sheet, or arranged between the separator and the negative electrode sheet. Specifically, a temperature-sampling film 117 is inserted between the positive electrode sheet and the diaphragm, and/or between the negative electrode sheet and the diaphragm, and the temperature-sampling film 117 is used to collect temperature parameters of the positive electrode sheet and/or the negative electrode sheet. One end of the temperature collecting film 117 is connected with the temperature collection module described in any of the above-mentioned embodiments, and the temperature collecting film 117 is also used to send the collected temperature parameters to the temperature collection module, so that the temperature collection module, the main control module, the external At least one of the devices controls the working state of the battery cell 100 according to the temperature parameter and/or the processed temperature parameter. It can be understood that the temperature collecting film 117 can be attached to any one of the diaphragm, the positive electrode sheet, and the negative electrode sheet, or there is a gap between the temperature collecting film 117 and the positive electrode sheet, the negative electrode sheet, and the diaphragm, the size of the gap and the temperature collecting film 117 The specific attachment position can be adaptively adjusted according to the accuracy of temperature collection or other conditions. In addition, the depth at which the temperature-collecting film 117 is inserted into the core 103 can also be adjusted adaptively according to actual conditions, which is not specifically limited in this embodiment of the present application.

In some embodiments, the battery cell 100 further includes an infrared emitting module and an infrared receiving module. The infrared emitting module is arranged inside the housing 101, and the infrared emitting module is used for emitting infrared signals to the winding core 103; the infrared receiving module is arranged inside the casing 101, and the infrared receiving module is used for receiving reflected signals of the infrared signals. The acquisition module also includes a temperature acquisition module, which is connected to the main control module. The temperature acquisition module is used to connect with the infrared receiving module. The temperature acquisition module is used to calibrate the reflected signal and generate the temperature parameters of the winding core 103 .

Specifically, the infrared emitting module is used to generate an infrared signal according to a control signal sent by the main control module, or the main control module is used to control the infrared emitting module to generate an infrared signal according to an external signal sent by an external device. The emitting end of the infrared emitting module is arranged towards the direction of the winding core 103, so that the infrared signal can be reflected at the winding core 103 and a corresponding reflection signal is generated. The infrared receiving module receives the reflected signal and sends it to the main control module. The main control module analyzes and processes the reflected signal, or the main control module sends the reflected signal to the external device through the communication module for analysis and processing, so as to obtain the reflected signal. The temperature parameter of the winding core, so as to realize the temperature detection of the winding core 103.

In addition, the collection of pressure parameters will be described in detail. It can be understood that, when the acquisition circuit is integrated by at least one chip on the PCB, the pressure acquisition module can be an independent chip on the PCB; when the acquisition circuit is an integrated chip, the pressure acquisition module consists of the integrated It consists of multiple pins on the chip and the components connected to the pins.

Referring to FIG. 4 and FIG. 6 , in some embodiments, the cell 100 further includes an explosion-proof valve 118 disposed on the cover plate 102 . The collection module 110 also includes a pressure collection module 119 , which is respectively connected to the explosion-proof valve 118 and the main control module 111 . The pressure collection module 119 is used to collect pressure parameters of the core 103 . Specifically, the cover plate 102 is provided with a through hole, and the explosion-proof valve 118 is arranged at the through hole and seals the through hole. During the working process of the battery cell 100 , gas may be generated inside the battery cell 100 , and the gas may gradually increase the air pressure inside the housing 101 , which may cause the battery cell 100 to bulge, leak, and rupture the diaphragm. Therefore, when the gas pressure in the housing 101 is too high, the gas in the housing 101 will break through the explosion-proof valve 118 and be discharged from the explosion-proof valve 118 to the external environment, so as to ensure the safety of the battery cell 100 and the external equipment 113 . The collection end of the pressure collection module 119 is set at any position inside the casing 101, the pressure collection module 119 is used to collect the pressure parameters in the casing 101, and the main control module 111 or the external device 113 judges the pressure inside the casing 101 according to the pressure parameters. barometric conditions. When the pressure parameter is greater than the preset threshold, the main control module 111 or the external device 113 controls the explosion-proof valve 118 to open and/or perform other emergency operations, so as to provide timely early warning protection for the battery cell 100 . It can be understood that the emergency operation may include suspending the charging operation of the winding core 103, etc., which is not specifically limited in this embodiment of the present application. The preset threshold can be set adaptively according to the actual situation, which is not specifically limited in this embodiment of the present application.

4 and 7, in some embodiments, a through hole 120 is provided on the cover plate 102 of the battery cell 100, and the battery cell 100 also includes a housing chamber 121 and a seal 122, and the housing chamber 121 is provided with an opening for housing The opening end of the cavity 121 is covered in the circumferential direction of the through hole 120 , and the sealing member 122 is used to seal the through hole 120 . The collection module 110 also includes a pressure collection module 119, which is connected to the main control module 111, and the pressure collection module 119 is used to collect pressure parameters of the winding core. Specifically, a through hole 120 is opened on the cover plate 102, the accommodating cavity 121 is used to seal the through hole 120 on the side facing the external environment, and the sealing member 122 is used to seal the through hole 120 on the side facing the inside of the housing, A sealed cavity is formed between the receiving cavity 121 and the sealing member 122 . Wherein, the material of the sealing member 122 is a piezoelectric material or a deformable material. When the material of the sealing member 122 is a piezoelectric material, the sealing member 122 is squeezed by the gas in the casing to generate a voltage, and the collecting end of the pressure collecting module 119 is attached to Attached to the surface of the seal 122, the pressure acquisition module 119 is used to acquire the voltage and form a pressure parameter according to the voltage. When the sealing member 122 is a deformable material, the collecting end of the pressure collecting module 119 is disposed in the sealed cavity formed by the receiving cavity 121 and the sealing member 122 , or the collecting end of the pressure collecting module 119 is attached to the sealing member 122 . Taking the collection end of the pressure collection module 119 disposed in the sealed cavity as an example, when the gas pressure inside the housing increases, the sealing member 122 is squeezed by the gas and deforms toward the sealed cavity, thus causing the sealed cavity to The air pressure in the body increases. The pressure collection module 119 is used to collect pressure parameters in the sealed cavity, and send the pressure parameters to the main control module 111, so as to obtain the pressure parameters of the winding core according to the pressure parameters in the sealed cavity. When the pressure parameter in the sealed cavity is greater than the preset threshold, it indicates that the gas pressure in the environment where the winding core is located is too high. At this time, the main control module 111 or the external device 113 controls the opening of the explosion-proof valve and/or performs other emergency operations to protect the electric The core 100 performs timely early warning protection.

Finally, the collection of internal resistance parameters is described in detail. It can be understood that when the acquisition circuit is integrated by at least one chip on the PCB, the internal resistance detection module can be an independent chip on the PCB; when the acquisition circuit is an integrated chip, the internal resistance detection module consists of It consists of multiple pins on the integrated chip and components connected to the pins.

3 and 4, in some embodiments, the acquisition circuit also includes an internal resistance detection module 123, the internal resistance detection module 123 is used to detect the voltage change parameter of the winding core, and the main control module 111 obtains the winding core according to the voltage change parameter. internal resistance parameters. One end of the internal resistance detection module 123 is electrically connected to the main control module 111 , and the other end of the internal resistance detection module 123 is respectively connected to the positive tab and the negative tab. Alternatively, one end of the internal resistance detection module 123 is connected to the main control module 111 , and the other end of the internal resistance detection module 123 is respectively connected to the positive pole and the negative pole. Specifically, the internal resistance of the cell includes ohmic internal resistance and polarization internal resistance. In the embodiment of the present application, the type of internal resistance is not specifically limited, so the following uses internal resistance as a general term for ohmic internal resistance and polarization internal resistance Describe in detail. The internal resistance of the battery cell is an important factor affecting the power performance and discharge efficiency of the battery cell. As the storage time of the battery cell increases, the battery cell will continue to age and its internal resistance will continue to increase. Therefore, the power performance and service life of the battery cell can be judged by the internal resistance parameter.

In some specific embodiments, the internal resistance detection module 123 includes a signal generation unit, a detection resistor R1 and an analog-to-digital conversion unit (ADC). The signal generation unit is respectively connected to the positive tab and the main control module 111, and the signal generation unit is used to generate an excitation signal according to the control signal. One end of the detection resistor R1 is connected to the signal generating unit, and the other end of the detection resistor R1 is connected to the negative pole ear. The analog-to-digital conversion unit is respectively connected to the positive tab, the detection resistor R1, and the main control module 111, and the analog-to-digital conversion unit is used to detect the voltage change parameter of the winding core according to the excitation signal. Specifically, the signal generation unit is connected in series with the detection resistor R1, the signal generation unit includes components such as a sine wave generator for generating excitation signals, and the signal generation unit is used to load a The AC input with a small amplitude is used as the excitation signal, and the analog-to-digital conversion unit is used to detect the change of the voltage at both ends of the winding core (positive tab and negative tab) and obtain voltage change parameters. The main control module 111 analyzes and processes the voltage change parameter, or the main control module 111 sends the voltage change parameter to the external device 113 through the communication module for analysis and processing, so as to obtain the internal resistance parameter of the winding core. The main control module 111 or the external device 113 determines the power performance and/or the remaining service life of the winding core according to the internal resistance parameter, and controls the working state of the winding core according to the power performance and/or the remaining service life.

Referring to FIG. 3 and FIG. 4 , in some embodiments, the acquisition circuit 106 further includes an equalization module 124 . One end of the equalization module 124 is connected to the main control module 111 , and the other end of the equalization module 124 is respectively connected to the positive tab and the negative tab. Alternatively, one end of the equalization module 124 is connected to the main control module 111 , and the other end of the equalization module 124 is respectively connected to the positive pole and the negative pole. Wherein, the equalization module 124 is configured to perform an equalization operation on the winding core according to a control signal, and/or the main control module 111 is used to control the equalization module 124 to perform an equalization operation according to an external signal. Specifically, the battery module includes a plurality of batteries as described in the above-mentioned embodiments. Since the voltage or state of charge of each battery is not exactly the same at the time of delivery, or the battery leaks or self-discharges over time, etc. , so that the charging requirements or discharging requirements of each cell in the battery module are inconsistent. Therefore, the battery management system needs to perform balanced management on the cells in the battery module to ensure that the cells in the battery module have the same state of charge. In the embodiment of the present application, the main control module 111 generates a control signal to control the equalization module 124 to perform an equalization operation on the winding core, and/or the main control module 111 receives the external signal sent by the external device 113 through the communication module, and controls according to the external signal The equalization module 124 equalizes the winding cores. Wherein, the equalization operation includes a passive equalization operation and an active equalization operation, and below, the passive equalization operation is taken as an example for specific description.

The balancing module 124 includes a balancing resistor R2 and a controllable switch K1. One end of the balancing resistor R2 is connected to the positive ear or the positive pole. The controllable end of the controllable switch K1 is connected to the main control module 111, and the controllable switch K1 is also respectively connected to the other end of the balancing resistor R2 and the negative electrode ear; or, the controllable end of the controllable switch K1 is connected to the main control module 111, The controllable switch K1 is also respectively connected to the other end of the balancing resistor R2 and the negative pole. Wherein, the controllable switch K1 is used to turn on or off according to a control signal; and/or, the main control module 111 is used to control the controllable switch K1 to turn on or off according to an external signal. Specifically, the balancing resistor R2 is connected in series with the controllable switch K1, and the controllable switch K1 includes any one of an electronic switch, a MOS tube and a transistor. The main control module 111 controls the conduction of the controllable switch K1 to conduct the series circuit between the equalizing resistor R2 and the winding core, and the equalizing module 124 uses the equalizing resistor R2 to convert the excess energy of the winding core into heat energy to consume The excess energy of the winding core in the battery module can achieve the balance of the state of charge of each cell in the battery module.

Referring to FIG. 3 and FIG. 4 , in some embodiments, the acquisition circuit further includes a power protection module 125 . One end of the power protection module 125 is used to connect to an external power source 126 , and the other end of the power protection module 125 is connected to the main control module 111 . Specifically, the acquisition circuit 106 is powered by an external power supply 126. When the acquisition circuit 106 is integrated with at least one chip on the PCB, the power protection module 125 can be an independent chip on the PCB; when the acquisition circuit 106 is For an integrated chip, the power protection module 125 is composed of multiple pins on the integrated chip and components connected to the pins. The power protection module 125 includes a power isolation unit and an electrical signal conversion unit, and one end of the power isolation unit is used to connect with the external power supply 126; one end of the electrical signal conversion unit is connected with the other end of the power isolation unit, and the other end of the electrical signal conversion unit is connected to the other end of the electrical signal conversion unit. The main control module 111 is connected, and the electrical signal conversion unit is used for converting the power supply signal provided by the external power supply 126 . For example, the power isolation unit includes a power isolation transformer, and the electrical signal conversion unit includes a charge pump, a diode, an undervoltage protector, an LDO (Low Dropout Regulator, a low dropout linear regulator), etc., and the electrical signal conversion unit is used for external power supply 126 The provided power supply signal performs operations such as voltage changes to meet the power supply requirements of the acquisition circuit 106 and protect the power supply safety of the acquisition circuit 106 . It can be understood that the components included in the power isolation unit and the electrical signal conversion unit can also be selected adaptively according to the actual situation, which is not specifically limited in this embodiment of the present application.

The embodiment of the present application also provides a battery module, which includes a plurality of battery cells as described in any one of the above embodiments.

The embodiment of the present application also provides a battery pack, the battery pack includes at least one battery module as described in the above embodiments and a battery management system, and the battery management system is connected to the communication module of at least one battery cell. Specifically, the battery management system is used to connect with the communication module of each single cell in the battery pack, so as to realize the detection of the working state of each single cell and avoid the The impact on the battery module, etc. caused by being ignored.

Embodiments of the present application also provide an electric vehicle, which includes at least one battery pack as described in the above embodiments.

The embodiments of the present application have been described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned embodiments, and within the scope of knowledge of those of ordinary skill in the art, various modifications can be made without departing from the purpose of the present application. Variety. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other under the condition of no conflict.

Claims

The electric core is characterized in that it includes:

a housing provided with at least one opening;

a cover plate, arranged at the open end of the housing, and enclosing the open end of the housing;

A winding core, disposed inside the casing, the winding core includes a positive electrode sheet, a negative electrode sheet, a positive electrode ear, and a negative electrode ear, the positive electrode sheet is connected to the positive electrode ear, and the negative electrode sheet is connected to the negative electrode ear;

A positive pole and a negative pole, the positive pole and the negative pole are respectively arranged on the cover plate, the positive pole is connected to the positive pole ear, and the negative pole is connected to the negative pole ear;

The collection circuit is arranged inside the casing, the collection circuit includes at least one chip, and the collection circuit is used to collect the working parameters of the winding core.
The battery cell according to claim 1, wherein the acquisition circuit comprises:

A collection module, configured to collect the working parameters of the winding core;

A main control module, connected to the acquisition module, for generating a control signal according to the working parameters;

A communication module, connected to the main control module, for sending the operating parameters to external devices according to the control signal, and/or the communication module for receiving external signals;

Wherein, the main control module is also used to control the working state of the winding core according to the external signal; the acquisition module, the main control module and the communication module are arranged on the same circuit board.
The battery cell according to claim 2, wherein the acquisition module comprises:

An electrical signal acquisition module, the electrical signal acquisition module is respectively connected to the winding core and the main control module, and the electrical signal acquisition module is used to acquire at least one of the voltage parameters, current parameters, and power parameters of the winding core A sort of.
The electric core according to claim 3, wherein the winding core further comprises a first collecting tab, and the first collecting tab is connected to the positive plate;

One end of the electrical signal acquisition module is connected to the first acquisition tab, and the other end of the electrical signal acquisition module is connected to the negative column or the negative tab;

and / or,

The winding core also includes a second collecting tab, and the second collecting tab is connected to the negative electrode sheet;

One end of the electrical signal acquisition module is connected to the second acquisition tab, and the other end of the electrical signal acquisition module is connected to the positive column or the positive tab.
The battery cell according to claim 3, further comprising:

A first connecting piece, the first connecting piece is arranged inside the housing, one end of the first connecting piece is connected to the positive tab, and the other end of the first connecting piece is connected to the electrical signal acquisition module connection; wherein, the electrical signal acquisition module is connected to the negative pole or the negative ear;

and / or,

A second connecting piece, the second connecting piece is arranged inside the housing, one end of the second connecting piece is connected to the negative tab, and the other end of the second connecting piece is connected to the electrical signal acquisition module connection; wherein, the electrical signal acquisition module is connected to the positive pole or the positive ear.
The battery cell according to any one of claims 2 to 5, wherein the acquisition module further comprises: a temperature acquisition module connected to the main control module, the temperature acquisition module is used for Collecting temperature parameters of the winding core;

Wherein, the temperature collection module is used to connect with the positive pole and/or the negative pole.
The battery cell according to claim 4, wherein the acquisition module further comprises: a temperature acquisition module connected to the main control module, and the temperature acquisition module is used to acquire the temperature of the winding core temperature parameters;

Wherein, the temperature collection module is used to connect with the first collection tab and/or the second collection tab.
The battery cell according to any one of claims 2 to 5, wherein the acquisition module further comprises: a temperature acquisition module connected to the main control module, the temperature acquisition module is used for Collecting temperature parameters of the winding core;

The winding core also includes a diaphragm, and the diaphragm is arranged between the positive electrode sheet and the negative electrode sheet; the battery core also includes at least one temperature-collecting film, and at least one temperature-collecting film is arranged between the diaphragm and the negative electrode sheet. Between the positive electrode sheets, or at least one of the temperature-collecting thin films is arranged between the separator and the negative electrode sheets;

Wherein, the temperature collection module is used to connect with the temperature collection film.
The battery cell according to any one of claims 2 to 5, further comprising: an infrared emitting module and an infrared receiving module; the infrared emitting module is arranged inside the housing, and the infrared emitting module is used for transmitting an infrared signal to the winding core; the infrared receiving module is arranged inside the casing, and the infrared receiving module is used to receive a reflected signal of the infrared signal;

The acquisition module also includes: a temperature acquisition module, the temperature acquisition module is connected with the main control module, the temperature acquisition module is used for connecting with the infrared receiving module, and the temperature acquisition module is used for detecting the reflected signal to calibrate and generate temperature parameters for the winding core.
The electric core according to any one of claims 2 to 5, further comprising: an explosion-proof valve, the explosion-proof valve being arranged on the cover plate;

The acquisition module further includes: a pressure acquisition module, the pressure acquisition module is respectively connected with the explosion-proof valve and the main control module, and the pressure acquisition module is used to acquire the pressure parameters of the winding core.
The battery cell according to any one of claims 2 to 5, wherein the cover plate is provided with a through hole;

The electric core also includes: a storage cavity and a seal, the storage cavity is provided with an opening, the opening end cover of the storage cavity is arranged in the circumferential direction of the through hole, and the seal is used to seal the through hole. hole;

The collection module further includes: a pressure collection module connected to the main control module, the pressure collection module is used to collect pressure parameters of the winding core.
The battery cell according to claim 11, wherein the material of the sealing member is a piezoelectric material;

Wherein, the pressure acquisition module is connected with the sealing element.
The cell according to any one of claims 2 to 5, wherein the acquisition circuit further comprises:

An equalization module, one end of the equalization module is connected to the main control module, and the other end of the equalization module is respectively connected to the positive ear and the negative ear; or, one end of the equalization module is connected to the main control Module connection, the other end of the balance module is connected to the positive pole and the negative pole respectively;

Wherein, the equalization module is used to perform an equalization operation on the winding core according to the control signal; and/or, the main control module is used to control the equalization module to perform an equalization operation according to the external signal.
The battery cell according to claim 13, wherein the equalization module comprises:

A balance resistor, one end of the balance resistor is connected to the positive ear or the positive column;

A controllable switch, the controllable end of the controllable switch is connected to the main control module, and the controllable switch is also respectively connected to the other end of the equalizing resistor and the negative electrode ear; or, the controllable switch The controllable end of the controllable switch is connected to the main control module, and the controllable switch is also respectively connected to the other end of the equalizing resistor and the negative pole;

Wherein, the controllable switch is used to turn on or off according to the control signal; and/or, the main control module is used to control the controllable switch to turn on or off according to the external signal.
The battery cell according to claim 14, wherein the controllable switch comprises any one of an electronic switch, a MOS tube and a transistor.
The cell according to claim 14 or 15, wherein the acquisition circuit further comprises:

An internal resistance detection module, one end of the internal resistance detection module is connected to the main control module, and the other end of the internal resistance detection module is respectively connected to the positive ear and the negative ear; or, the internal resistance detection One end of the module is connected to the main control module, and the other end of the internal resistance detection module is respectively connected to the positive pole and the negative pole; the internal resistance detection module is used to detect the voltage change parameter of the winding core ;

Wherein, the main control module is used to obtain the internal resistance parameter of the winding core according to the voltage change parameter.
The battery cell according to claim 16, wherein the internal resistance detection module comprises:

A signal generating unit, the signal generating unit is respectively connected to the positive ear and the main control module; the signal generating unit is used to generate an excitation signal according to the control signal;

A detection resistor, one end of the detection resistor is connected to the signal generating unit, and the other end of the detection resistor is connected to the negative ear;

An analog-to-digital conversion unit, the analog-to-digital conversion unit is respectively connected to the positive tab, the detection resistor, and the main control module, and the analog-to-digital conversion unit is used to detect the voltage of the winding core according to the excitation signal Variation parameters.
The battery cell according to claim 17, wherein the acquisition circuit further comprises:

A power protection module, one end of the power protection module is used to connect to an external power supply, and the other end of the power protection module is connected to the main control module.
The battery cell according to claim 18, wherein the power protection module comprises:

A power isolation unit, one end of the power isolation unit is used to connect to an external power supply;

An electrical signal conversion unit, one end of the electrical signal conversion unit is connected to the other end of the power isolation unit, the other end of the electrical signal conversion unit is connected to the main control module, and the electrical signal conversion unit is used for The power supply signal provided by the external power supply is converted.
The battery cell according to any one of claims 2 to 5, wherein the communication module comprises:

A first communication unit, the first communication unit includes an isolation subunit, one end of the isolation subunit is connected to the main control module, and the other end of the isolation subunit is used to connect to the external device.
The battery cell according to any one of claims 2 to 5, wherein the communication module comprises:

A second communication unit, the second communication unit is configured to connect with the external device through at least one of Bluetooth communication, radio frequency communication, and Wi-Fi communication.
The battery module is characterized by comprising: a plurality of battery cells according to any one of claims 1-21.
The battery pack is characterized in that it comprises:

At least one battery module as claimed in claim 22;

The battery management system is connected to the communication module of at least one battery cell.
The electric vehicle is characterized by comprising at least one battery pack as claimed in claim 23.