Battery monomer, battery pack and energy storage system

Abstract

The invention discloses a battery monomer, a battery pack and an energy storage system, and relates to the technical field of batteries. The single battery comprises a shell assembly, a detection assembly and a first transmission assembly, the shell assembly is provided with a containing cavity used for containing an electrode assembly, the detection assembly is located in the containing cavity and can directly detect parameter information in the single battery, and the first transmission assembly is located in the containing cavity and connected with the detection assembly. The first transmission assembly is used for generating a first sound wave signal based on the parameter information so as to enable the first sound wave signal to penetrate through the shell assembly in the direction away from the electrode assembly, and is used for receiving a second sound wave signal transmitted in the direction towards the electrode assembly and penetrating through the shell assembly, so that information transmission is carried out through sound waves; according to the invention, the shell assembly does not need to be destructively operated, so that communication between the detection assembly in the battery monomer and other units outside the battery monomer can be realized on the basis of ensuring the leakproofness and the structural reliability of the battery monomer, and the safety of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell, battery pack, and energy storage system. Background Technology

[0002] To improve the safety and lifespan of battery clusters such as energy storage systems and vehicle battery packs, it is necessary to monitor the parameter information of each individual battery cell and use a battery management system (BMS) to coordinate and balance the state of each battery cell. In practical applications, to achieve effective monitoring of the internal parameters of each battery cell, the monitoring components can be integrated inside the battery cell.

[0003] However, there is a communication requirement between the detection component and the battery management unit (BMU), and between the BMU and the battery management system. In order to transmit internal parameters to the external battery management system for overall planning and balancing, it is usually necessary to make holes in the casing of the battery cell in practical applications. This will significantly reduce the sealing performance and structural reliability of the battery cell. Summary of the Invention

[0004] The embodiments of this application provide a battery cell, a battery pack, and an energy storage system to achieve communication between the internal detection components, the battery management unit, and the battery management system of the battery cell while ensuring the airtightness and structural reliability of the battery cell.

[0005] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0006] In a first aspect, a battery cell is provided, comprising:

[0007] A housing assembly having a receiving cavity for accommodating an electrode assembly;

[0008] A detection component is located within the receiving cavity and is used to detect parameter information of the battery cell.

[0009] A first transmission component is located within the receiving cavity and is connected to the detection component;

[0010] The first transmission component is configured to generate a first acoustic signal based on the parameter information, so that the first acoustic signal penetrates the shell assembly in a direction away from the electrode assembly, and to receive a second acoustic signal that penetrates the shell assembly in a direction towards the electrode assembly.

[0011] In some embodiments, the first transmission component includes:

[0012] A signal acquisition and processing unit, connected to the detection component, is used to process the parameter information and determine the information to be transmitted;

[0013] A battery management unit, connected to the signal acquisition and processing unit, is used to translate the information to be transmitted into a first target signal;

[0014] A first acoustic wave generator and receiver, connected to the battery management unit, is used to generate the first acoustic wave signal based on the first target signal.

[0015] In some embodiments, the battery cell further includes:

[0016] A second transmission component is located on the side of the housing assembly facing away from the electrode assembly, and the second transmission component is used to receive the first acoustic signal generated by the first transmission component.

[0017] In some embodiments, the second transmission component includes:

[0018] The second sound wave generator and receiver is used to restore the first sound wave signal to the first target signal;

[0019] A wireless communication module, which is connected to the second acoustic wave generator receiver, is used to translate the first target signal into a first wireless signal for communication with the control module;

[0020] The wireless communication module is also used to receive the second wireless signal sent by the control module and decode it into a second target signal, so that the second sound wave generator receiver generates the second sound wave signal based on the second target signal, and the first sound wave generator receiver restores the second sound wave signal into the second target signal and sends it to the battery management unit.

[0021] In some embodiments, the housing assembly includes an inner sidewall facing the electrode assembly, the inner sidewall being used to enclose the receiving cavity;

[0022] The first sound wave generator receiver is disposed on the inner sidewall in a direction perpendicular to the inner sidewall, and the projection of the second sound wave generator receiver on the inner sidewall at least partially overlaps with the first sound wave generator receiver.

[0023] In some embodiments, the housing assembly includes an inner sidewall facing the electrode assembly, the inner sidewall forming the receiving cavity; the housing assembly has a receiving space having a first opening on the inner sidewall, the detection assembly and the first transmission assembly being received in the receiving space.

[0024] In some embodiments, the battery cell further includes an insulating component, the insulating component including a first insulating portion disposed in the receiving space and covering the first opening, the first insulating portion covering at least a portion of the detection component and the first transmission component.

[0025] In some embodiments, the insulating component further includes a second insulating portion connected to the first insulating portion and covering the inner sidewall.

[0026] In some embodiments, the housing assembly includes an inner sidewall facing the electrode assembly, the inner sidewall being used to enclose the receiving cavity;

[0027] The battery cell also includes an insulating component and a receiving space, the insulating component being located in the receiving cavity and connected to the shell assembly;

[0028] The receiving space is formed in the insulating component and is located within the insulating component; or the insulating component has a second opening on the side facing the housing component, and the inner sidewall covers the second opening.

[0029] In some embodiments, the battery cell further includes:

[0030] A terminal assembly, wherein the terminal assembly is disposed on the housing assembly;

[0031] A connection assembly is provided, wherein one end of the pole assembly facing the receiving cavity is connected to the detection assembly and the first transmission assembly via the connection assembly.

[0032] In a second aspect, a battery pack is provided, comprising battery cells as described in any one of the first aspects.

[0033] Thirdly, an energy storage system is provided, comprising:

[0034] The battery pack as described in the second aspect;

[0035] The control module is communicatively connected to the individual battery cells in the battery pack. The control module is used to receive parameter information of each individual battery cell and adjust the state of the individual battery cell based on the parameter information.

[0036] One of the above technical solutions has the following advantages or beneficial effects:

[0037] This application discloses a battery cell comprising a casing assembly, a detection assembly, and a first transmission assembly. The casing assembly has a cavity for housing an electrode assembly. The detection assembly is located within the cavity, enabling direct detection of internal parameter information of the battery cell. The first transmission assembly is located within the cavity and connected to the detection assembly. The first transmission assembly generates a first acoustic signal based on the parameter information, allowing the first acoustic signal to penetrate the casing assembly and transmit in a direction away from the electrode assembly. It also receives a second acoustic signal transmitted through the casing assembly in a direction towards the electrode assembly. This allows for information transmission via acoustic waves without destructive operations on the casing assembly. Consequently, while ensuring the airtightness and structural reliability of the battery cell, communication between the internal detection assembly and other external units of the battery cell can be achieved, improving the safety of the battery cell.

[0038] This application discloses a battery pack, including the aforementioned battery cells, which, while ensuring the airtightness and structural reliability of the battery cells, enables communication between the internal detection components of the battery cells and other external units, thereby improving the safety of the battery cells and extending their service life.

[0039] The present application discloses an energy storage system including a battery pack and a control module. The battery pack includes the aforementioned battery cells. The control module can communicate with the internal detection components of the battery cells while ensuring the airtightness and structural reliability of the battery cells. This can greatly improve the safety of the battery cells, extend their service life, and also facilitate the control module's monitoring and overall management of the status of each battery cell. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the overall structure of a battery cell provided in an embodiment of this application;

[0042] Figure 2 for Figure 1 Schematic diagram of the middle cover plate;

[0043] Figure 3 for Figure 1 A top view of the structure after removing the cover plate;

[0044] Figure 4 for Figure 1 A top view of the structure after removing the cover plate;

[0045] Figure 5 For along Figure 1 Schematic diagram of the cross-sectional structure along the Z-axis;

[0046] Figure 6 This is a schematic diagram of the structure of the first transmission component and the second transmission component disposed on the cover plate according to an embodiment of this application;

[0047] Figure 7 for Figure 6 Schematic diagram of the AA section structure;

[0048] Figure 8 This is a schematic diagram of the signal transmission of a single battery cell provided in an embodiment of this application;

[0049] Figure 9 A schematic flowchart illustrating a battery cell signal transmission method provided in an embodiment of this application;

[0050] Figure 10 A schematic flowchart illustrating another battery cell signal transmission method provided in an embodiment of this application;

[0051] Figure 11 This is a schematic diagram of the energy storage system provided in the embodiments of this application;

[0052] Figure label:

[0053] 10. Battery cell; 100. Casing assembly; 110. Receiving cavity; 120. Casing; 130. Cover plate; 131. Filling hole; 132. Explosion-proof valve; 140. Inner wall; 200. Insulation assembly; 210. First insulation part; 220. Second insulation part; 300. Detection assembly; 400. Receiving space; 410. First opening; 420. Second opening; 500. Terminal assembly; 510. Positive terminal; 520. Negative terminal; 530 540. Positive terminal seal ring; 600. Negative terminal seal ring; 610. Connecting assembly; 620. Positive terminal connecting wire; 630. Negative terminal connecting wire; 700. Lower plastic; 710. First transmission assembly; 720. Signal acquisition and processing unit; 730. Battery management unit; 800. First acoustic wave generator and receiver; 810. Second transmission assembly; 820. Second acoustic wave generator and receiver; 820. Wireless communication module; 20. Control module; 30. Battery pack. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0055] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0056] To improve the safety and lifespan of battery clusters such as energy storage systems and vehicle battery packs, it is necessary to monitor the parameters of each individual battery cell and use a battery management system (BMS) to coordinate and balance the status of each cell. Monitoring parameters such as voltage, current, internal pressure, gas composition, electrolyte content, and expansion force of battery cells can effectively guide the management of their usage status, thereby significantly improving their safety and lifespan.

[0057] To enable direct detection of internal parameters of individual battery cells, as a prerequisite for embodiments of this application, a detection component can be placed inside the battery cell's casing. After detecting the battery cell's parameters, the built-in detection component needs to transmit signals to the Battery Management Unit (BMU) to ensure that the BMU collects the parameter information and transmits it to the external control module for overall planning and balancing. If the BMU is placed outside the casing assembly, since the casing assembly is mostly made of metals such as aluminum and steel, the welded seal between the casing and the cover plate will create electromagnetic shielding for wireless signal transmission. Building the detection component inside would require breaking the casing's seal to achieve wired or wireless communication between the two. Although non-metallic covers or casings can be used, or an insulating cavity with a transmission hole can be provided in the casing assembly to introduce a wireless communication module, these methods pose significant risks to the current battery's airtightness and structural reliability, making it impossible to guarantee battery safety. If the battery management unit is placed inside the housing assembly, although communication between the detection component and the battery management unit can be ensured, the battery management unit also needs to transmit signals to the external control module. The battery management unit and the control module are connected via wiring harness or wireless communication in order to upload the status parameters of the individual battery cells to the control module for analysis and judgment. This communication requirement will still compromise the sealing and structural reliability of the battery housing.

[0058] In view of this, the present application provides a battery cell that utilizes the characteristic that sound waves can penetrate and transmit through a sealed metal environment. By integrating a detection component inside the battery cell and introducing a sound wave generator and receiver, parameter information is translated into sound waves for transmission. This enables signal transmission between the detection component inside the battery cell, the BMU, and the external BMS while ensuring the battery's airtightness and structural reliability, thereby solving at least part of the above-mentioned technical problems.

[0059] Please refer to the following: Figures 1 to 8 , Figure 1 This is a schematic diagram of the overall structure of a battery cell provided in an embodiment of this application; Figure 2 for Figure 1 Schematic diagram of the middle cover plate; Figure 3 for Figure 1 A top view of the structure after removing the cover plate; Figure 4 for Figure 1 A top view of the structure after removing the cover plate; Figure 5 For along Figure 1 Schematic diagram of the cross-sectional structure along the Z-axis; Figure 6 This is a schematic diagram of the structure of the first transmission component and the second transmission component disposed on the cover plate according to an embodiment of this application; Figure 7 for Figure 6 Schematic diagram of the AA section structure; Figure 8 This is a schematic diagram of signal transmission in a battery cell according to an embodiment of this application. The battery cell 10 provided in this embodiment includes a casing assembly 100, a detection assembly 300, and a first transmission assembly 700. The casing assembly 100 has a receiving cavity 110 for accommodating an electrode assembly. The detection assembly 300 is located within the receiving cavity 110 and is used to detect parameter information of the battery cell 10. The first transmission assembly 700 is located within the receiving cavity 110 and connected to the detection assembly 300. The first transmission assembly 700 is used to generate a first acoustic signal based on the parameter information, so that the first acoustic signal penetrates the casing assembly 100 in a direction away from the electrode assembly, and to receive a second acoustic signal transmitted through the casing assembly 100 in a direction towards the electrode assembly.

[0060] For example, the detection component 300 may include various sensors such as voltage detectors, current detectors, temperature detectors, expansion force detectors, pressure detectors, gas composition detectors, and electrolyte content detectors to detect various parameters of the battery cell 10, including voltage, current, temperature, expansion force, pressure, gas composition, and electrolyte content. In this way, the detection component 300 can comprehensively detect the internal parameter information of the battery cell 10, better meeting the detection requirements of the battery cell 10.

[0061] In some embodiments, the electrode assembly can be a bare battery cell obtained by winding or stacking positive and negative electrode sheets. The housing assembly 100 may include a housing 120 and a cover plate 130. The housing 120 may form a receiving cavity 110, and the cover plate 130 is connected to the housing 120 and seals the receiving cavity 110. The receiving cavity 110 is filled with electrolyte. The cover plate 130 may be provided with an injection hole 131 and an explosion-proof valve 132. The injection hole 131 is used to inject electrolyte into the receiving cavity 110, and the explosion pressure threshold of the explosion-proof valve 132 is typically lower than the explosion pressure threshold of the main body of the cover plate 130.

[0062] For example, the cover plate 130 and the housing 120 can be welded together. The cover plate 130 and the housing 120 can be made of metal, such as aluminum, steel, etc.

[0063] In some examples, the battery cell 10 can be a prismatic battery cell. The length direction of the prismatic battery cell is defined as the first direction X, the width direction as the second direction Y, and the height direction as the third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other. Figure 3 and Figure 4This is a top view of the housing 120 along the third direction Z. The prismatic battery cell has two first side surfaces arranged opposite each other along the first direction X and two first large surfaces arranged opposite each other along the second direction Y. The prismatic battery cell may have one or two openings arranged along the third direction Z. Taking one opening as an example, the prismatic battery cell also has a first bottom surface perpendicular to the third direction Z, then there is one cover plate 130, which covers the opening along the third direction Z to form a sealed receiving cavity 110 with the housing 120. Taking two openings as an example, then the two openings of the prismatic battery cell are arranged along the third direction Z, and there are two cover plates 130, which respectively cover the corresponding openings along the third direction Z to form a sealed receiving cavity 110 with the housing 120.

[0064] In other examples, the battery cell 10 can be a cylindrical battery cell. The height direction of the cylindrical battery cell is defined as a third direction Z, where the first direction X, the second direction Y, and the third direction Z intersect each other. The cylindrical battery cell has a second side surface that surrounds the third direction Z. The cylindrical battery cell can have one or two openings perpendicular to the third direction Z. Taking one opening as an example, the cylindrical battery cell also has a second bottom surface perpendicular to the third direction Z, then there is one cover plate 130, which covers the opening along the third direction Z to form a sealed receiving cavity with the housing 120. Taking two openings as an example, the two openings of the cylindrical battery cell are arranged opposite each other along the third direction Z, and there are two cover plates 130, which respectively cover the corresponding openings along the third direction Z to form a sealed receiving cavity 110 with the housing 120.

[0065] It is understood that the battery cell 10 can also be other shapes or other types of battery cells, and this application embodiment does not specifically limit this.

[0066] In this embodiment, the wavelength range of the first and second acoustic signals is 0.0001 Hz to 10 Hz. 12 Hz.

[0067] With the above scheme, the detection component 300 is located inside the receiving cavity 110, thereby enabling direct detection of parameter information inside the battery cell 10. The first transmission component 700 is located inside the receiving cavity 110 and connected to the detection component 300. The first transmission component 700 is used to generate a first acoustic signal based on the parameter information, so that the first acoustic signal penetrates the shell assembly 100 in a direction away from the electrode assembly, and is used to receive a second acoustic signal that penetrates the shell assembly 100 in a direction towards the electrode assembly. Thus, information is transmitted by means of acoustic waves, without the need for destructive operation on the shell assembly 100. In this way, while ensuring the airtightness and structural reliability of the battery cell 10, communication between the detection component 300 inside the battery cell 10 and other units outside the battery cell 10 can be realized, thereby improving the safety of the battery cell 10.

[0068] In this embodiment of the application, the first transmission component 700 and the detection component 300 can be disposed on the cover plate 130, for example... Figure 6 and Figure 7 As shown, it can also be installed on the housing 120, for example... Figure 5 As shown, this application embodiment does not specifically limit this. For example, when the first transmission component 700 and the detection component 300 are disposed on the cover plate 130, they can be specifically disposed on the side of the explosion-proof valve 132 away from the injection hole 131. The specific position can be determined according to the actual product structure.

[0069] In some embodiments, the first transmission component 700 includes a signal acquisition and processing unit 710, a battery management unit 720, and a first acoustic wave generator and receiver 730. The signal acquisition and processing unit 710 is connected to the detection component 300 and is used to process parameter information to determine the information to be transmitted. The battery management unit 720 is connected to the signal acquisition and processing unit 710 and is used to decode the information to be transmitted into a first target signal. The first acoustic wave generator and receiver 730 is connected to the battery management unit 720 and is used to generate a first acoustic wave signal based on the first target signal.

[0070] With the above scheme, the signal acquisition and processing unit 710, the battery management unit 720 and the first acoustic wave generator and receiver 730 are all located in the receiving cavity 110, so that the detection component 300 and the battery management unit 720 can directly transmit signals, which facilitates communication.

[0071] In some embodiments, the battery cell 10 further includes a second transmission component 800, which is located on the side of the housing assembly 100 opposite to the electrode assembly. Exemplarily, the second transmission component 800 can be fixed to the outer wall of the housing assembly 100 opposite to the electrode assembly by methods such as pasting, welding, or snap-fitting. The second transmission component 800 is used to receive a first acoustic signal generated by the first transmission component 700. In this way, the first acoustic signal emitted by the first transmission component 700 can penetrate the metal-sealed environment of the housing assembly 100 and be received and converted into an electrical signal by the second transmission component 800, thereby facilitating communication with external modules and enabling communication between the internal detection component 300 and the external module without compromising the sealing of the housing assembly 100.

[0072] In some embodiments, the second transmission component 800 may include a second acoustic wave generator / receiver 810 and a wireless communication module 820. The second acoustic wave generator / receiver 810 is used to restore the first acoustic wave signal to a first target signal. The wireless communication module 820 is connected to the second acoustic wave generator / receiver 810 and is used to decode the first target signal into a first wireless signal for communication with the control module 20. The first wireless signal may be transmitted using transmission methods such as NFC (Near Field Communication), WIFI (Wireless Fidelity), or Bluetooth. The control module 20 may be an external battery management system. The control module 20 is communicatively connected to the wireless communication module 820 and is used to receive corresponding wireless signals and interact with the wireless communication module 820.

[0073] The wireless communication module 820 is also used to receive the second wireless signal sent by the control module 20 and decode it into a second target signal, so that the second sound wave generator receiver 810 generates a second sound wave signal based on the second target signal, and the first sound wave generator receiver 730 restores the second sound wave signal into the second target signal and sends it to the battery management unit 720.

[0074] Through the above solution, the detection component 300 and the battery management unit 720 communicate directly inside the housing component 100, and the battery management unit 720 communicates with the external control module 20 through sound waves. Thus, without performing any destructive operations on the housing component 100, signal interaction between the detection component 300, the battery management unit 720, and the external BMS can be achieved. This can effectively improve the pain point of the current situation where signal transmission and housing strength cannot be simultaneously achieved when the detection component 300 is built-in.

[0075] For example, the signal transmission process of the battery cell 10 provided in this application embodiment includes:

[0076] When the internal parameter information of the battery cell 10 is transmitted outward, the parameter information of the detection component 300 inside the casing assembly 100 is processed by the signal acquisition and processing unit 710 to determine the information to be transmitted, and then the information to be transmitted is transmitted to the battery management unit 720. The battery management unit 720 decodes the information to be transmitted into a first target signal, and the first acoustic wave generator 730 generates a first acoustic wave signal based on the first target signal. The first acoustic wave signal penetrates the casing assembly 100 and is transmitted to the second acoustic wave generator 810 outside the battery cell 10. The second acoustic wave generator 810 restores the first acoustic wave signal to the first target signal, and the wireless communication module 820 decodes the received first target signal into a first wireless signal that can be wirelessly transmitted, so as to realize the transmission of information from the battery management unit 720 to the external control module 20 (i.e., BMS).

[0077] When the control module 20 transmits signals to the battery management unit 720 inside the battery cell 10, after collecting all battery parameters in the system, the control module 20 analyzes and judges all information and determines whether to send a control signal to the battery management unit 720 of a certain battery. When the control module 20 sends the second wireless signal (i.e., the control signal), the wireless communication module 820 outside the battery cell 10 receives the second wireless signal and decodes it into a second target signal. The second acoustic wave generator receiver 810 generates a second acoustic wave signal based on the second target signal. The second acoustic wave signal penetrates the shell assembly 100 and is transmitted to the first acoustic wave generator receiver 730 inside the battery cell 10. The first acoustic wave generator receiver 730 restores the second acoustic wave signal to the second target signal and sends it to the battery management unit 720. The battery management unit 720 decodes the received second acoustic wave signal into a readable signal to control the battery status.

[0078] Through the above scheme, by detecting the signal interaction between the component 300, the battery management unit 720 and the external BMS, the parameter information inside the battery cell 10 can be transmitted to the external BMS, so that the external BMS can coordinate and balance the state of multiple battery cells 10 and issue corresponding control commands, thereby better monitoring the state of the battery cell 10, enabling timely detection of abnormalities and reducing the probability of failure of the battery cell 10 or the entire battery pack.

[0079] In some embodiments, the housing assembly 100 includes an inner sidewall 140 facing the electrode assembly, the inner sidewall 140 forming a receiving cavity 110. A first acoustic wave generator receiver 730 is disposed on the inner sidewall 140, and the projection of a second acoustic wave generator receiver 810 onto the inner sidewall 140 at least partially overlaps with the first acoustic wave generator receiver 730 in a direction perpendicular to the inner sidewall 140 (i.e., the second direction Y). This maximizes the signal transmission strength between the second acoustic wave generator receiver 810 and the first acoustic wave generator receiver 730, thereby ensuring optimal signal transmission performance and improving signal transmission quality. It is understood that in other embodiments, the second acoustic wave generator receiver 810 may not completely overlap with the first acoustic wave generator receiver 730, but may only be located within the acoustic wave transmission range of the first acoustic wave generator receiver 730.

[0080] In some embodiments, the housing assembly 100 includes an inner sidewall 140 facing the electrode assembly, the inner sidewall 140 forming a receiving cavity 110. The housing assembly 100 has a receiving space 400, the receiving space 400 having a first opening 410 in the inner sidewall 140, and the detection assembly 300 and the first transmission assembly 700 are received in the receiving space 400. Exemplarily, the detection assembly 300 and the first transmission assembly 700 are located within the receiving space 400 and do not protrude from the first opening 410.

[0081] In some examples, the method of forming the accommodating space 400 on the shell assembly 100 may include powder / liquid spraying, UV (Ultraviolet) curing, stamping, integral injection molding, etc.

[0082] In some examples, the receiving space 400 is formed on the housing 120 and / or the cover 130. That is, the receiving space 400 may be formed on the housing 120, or on the cover 130, or on both the housing 120 and the cover 130. This avoids the situation where, during the use of the battery cell 10, its own weight causes other components within the receiving cavity 110 to compress the detection component 300 in the receiving space 400, thereby affecting the detection performance of the detection component 300.

[0083] For example, taking a prismatic battery cell as an example, the accommodating space 400 can be formed at any position on the first side, the first large surface, the first bottom surface, or the cover plate 130. Taking a cylindrical battery cell as an example, the accommodating space 400 can be formed at any position on the second side or the cover plate 130.

[0084] In some examples, the accommodating space 400 is formed on the housing 120. This allows for a larger and more flexible forming space, avoids interference with the positions of other components within the battery cell 10, and facilitates fabrication and installation.

[0085] In some examples, the receiving space 400 is formed on the housing 120 and the cover plate 130. That is, the receiving space 400 formed on the housing 120 and the receiving space 400 formed on the cover plate 130 together form a complete receiving space 400 that can accommodate the detection component 300. The cover plate 130 has a first end face facing the housing 120, and the housing 120 has a second end face facing the cover plate 130. The shape of the first end face matches the shape of the second end face. In this way, the cover plate 130 and the housing 120 can fit together more closely, thereby ensuring the sealing of the cover plate 130 and the housing 120, reducing assembly difficulty, and preventing internal electrolyte leakage.

[0086] It is understandable that at the connection between the housing 120 and the cover plate 130, the outer side wall of the housing 120 and the outer side wall of the cover plate 130 should match in shape, and the inner side wall 140 of the housing 120 and the inner side wall 140 of the cover plate 130 should also match in shape. This can better ensure the connection between the housing 120 and the cover plate 130, thereby ensuring the sealing of the battery cell 10 and improving safety in use.

[0087] With the above solution, a receiving space 400 is constructed on the shell assembly 100. After the detection component 300 and the first transmission component 700 are placed in the receiving space 400 on the shell assembly 100, the space of the receiving cavity 110 can be avoided. Moreover, the positional interference with the electrode assembly can be avoided. This avoids the uneven stress caused by the expansion of the electrode sheet when there is an interaction force between the detection component 300 and the electrode assembly, which may even lead to lithium plating. This greatly reduces the safety risk of the battery cell 10.

[0088] In some embodiments, the battery cell 10 further includes an insulating component 200, which includes a first insulating portion 210 disposed in the receiving space 400 and covering the first opening 410. The first insulating portion 210 covers at least a portion of the detection component 300 and the first transmission component 700 to isolate the detection component 300 and the first transmission component 700 from the receiving cavity 110. It is understood that the housing assembly 100 may cover the remaining portion of the detection component 300 and the first transmission component 700.

[0089] In some embodiments, the material of the insulating component 200 may include at least one of PP (Polypropylene), PE (Polyethylene), PET (Polyethylene terephthalate), and PI (Polyimide). The insulating component 200 may be applied to the corresponding surface of the shell component 100 by means of powder / liquid spraying, UV curing, casting, blow molding, etc.

[0090] Through the above scheme, a receiving space 400 is constructed on the shell assembly 100. After the detection assembly 300 and the first transmission assembly 700 are placed in the receiving space 400, the detection assembly 300 and the first transmission assembly 700 are embedded in it using the insulating assembly 200. This allows the detection assembly 300 and the first transmission assembly 700 to be isolated from the chemical substances in the receiving cavity 110 under the protection of the insulating assembly 200, thereby eliminating the adverse effects of the electrolyte on the detection assembly 300 and the first transmission assembly 700 and avoiding affecting their lifespan and accuracy.

[0091] In some embodiments, the insulating assembly 200 further includes a second insulating portion 220, which is connected to the first insulating portion 210 and covers the inner sidewall 140. It is understood that the second insulating portion 220 is equivalent to an insulating film, covering all exposed surfaces on the inner sidewall 140 of the housing assembly 100, thereby isolating the electrolyte from contact with the inner sidewall 140 and saving the use of insulating components such as insulating films in the electrode assembly.

[0092] Through the above scheme, while using the first insulating part 210 to embed the detection component 300 and the first transmission component 700, the second insulating part 220 also covers all the inner sidewalls 140 of the shell assembly 100, isolating the electrolyte from contact with the detection component 300 and the first transmission component 700 and acting as an insulating film. This can prevent the electrolyte or reaction byproducts in the receiving cavity 110 from corroding the detection component 300 and the first transmission component 700 from all possible directions, so that the service life of the detection component 300 and the first transmission component 700 and the homogeneity of the internal chemical composition of the battery cell 10 will not be affected. It can also avoid the uneven stress caused by the expansion of the electrode sheet when there is an interaction force between the detection component 300 and the first transmission component 700 and the electrode assembly, which may even lead to lithium plating. This greatly reduces the safety risk of the battery cell 10.

[0093] In other embodiments, the housing assembly 100 includes an inner sidewall 140 facing the electrode assembly, the inner sidewall 140 forming a receiving cavity 110. The battery cell also includes an insulating assembly 200 and a receiving space 400, the insulating assembly 200 being located in the receiving cavity 110 and connected to the housing assembly 100. The receiving space 400 is formed in the insulating assembly 200 and is located within the insulating assembly 200; alternatively, the insulating assembly 200 has a second opening 420 on the side facing the housing assembly 100, and the inner sidewall 140 covers the second opening 420. Thus, without requiring additional adjustments to the structure of the housing assembly 100, processing and implementation are more convenient by forming the receiving space 400 on the insulating assembly 200.

[0094] In other embodiments, the accommodating space 400 may be formed on the insulating component 200 and the shell component 100, and this application does not specifically limit this. The accommodating space 400 can be flexibly formed on the insulating component 200 and the shell component 100, which has greater manufacturing flexibility. Moreover, the accommodating space 400 can fully protect the various internal components, avoiding corrosion by the electrolyte or the generation of reaction by-products, thereby promoting the homogeneity of the chemical composition inside the accommodating cavity 110, improving the service life of the battery cell 10, and reducing the probability of failure.

[0095] It should be noted that the size of the accommodating space 400 in this embodiment is determined by the size of the detection component 300 and the size of the first transmission component 700 to be accommodated. There can be one or more accommodating spaces 400, and multiple accommodating spaces 400 can be used to accommodate different detection components and / or the first transmission component 700. This embodiment does not specifically limit the location, number, or size of the accommodating spaces 400.

[0096] In some embodiments, the battery cell 10 further includes a terminal assembly 500 and a connection assembly 600, the terminal assembly 500 being disposed on the housing assembly 100. One end of the terminal assembly 500 facing the receiving cavity 110 is connected to the detection assembly 300 and the first transmission assembly 700 via the connection assembly 600. Exemplarily, the terminal assembly 500 includes a positive terminal 510 and a negative terminal 520, the positive terminal 510 being sealed to the cover plate 130 by a positive terminal sealing ring 530, and the negative terminal 520 being sealed to the cover plate 130 by a negative terminal sealing ring 540.

[0097] In some examples, at least a portion of the connecting component 600 may be embedded in the insulating component 200.

[0098] In some examples, the connection assembly 600 may include a positive connection wire 610, a negative connection wire 620, and a first voltage line. The first voltage line may be disposed within the insulating assembly 200 and connected to the detection assembly 300 for acquiring voltage and current signals. A voltage interface may be provided at the other end of the first voltage line. The positive connection wire 610 extends from the positive terminal 510, and the negative connection wire 620 extends from the negative terminal 520. The positive connection wire 610 and the negative connection wire 620 converge to form a second voltage line, which is connected to the voltage interface to connect to the first voltage line. The second voltage line may be wrapped with insulating material. A seal may also be provided at the voltage interface to isolate the voltage interface. In this way, the seal ensures that the voltage interface is not affected by the electrolyte after the first and second voltage lines are connected.

[0099] For example, the connection assembly 600 may further include a lower plastic 630. The lower plastic 630 is disposed on the side of the second voltage line facing the electrode assembly, and the lower plastic 630 has lead holes to lead out the second voltage line and further reduce the influence of electrolyte on the second voltage line.

[0100] In this embodiment, the positive electrode connection line 610 and the negative electrode connection line 620, in addition to being connected to the detection component 300 for collecting voltage and current signals, can also be connected to the first transmission component 700 to provide it with an energy source. Specifically, the positive electrode connection line 610 and the negative electrode connection line 620 are connected to the battery management unit 720 to supply energy to the battery management unit 720 and send control commands. The positive electrode connection line 610 and the negative electrode connection line 620 are also connected to the first sound wave generator receiver 730 to supply energy to the first sound wave generator receiver 730.

[0101] With the above solution, the detection component 300 inside the housing assembly 100 is connected to the pole assembly 500 on the cover plate 130 through the connecting component 600, so that no additional holes need to be made on the housing assembly 100, which is beneficial to the airtightness and strength reliability of the housing assembly 100. Moreover, at least part of the connecting component 600 is embedded in the insulating component 200, which can isolate the influence of chemical substances such as electrolyte in the receiving cavity 110, improve the signal transmission quality, and reduce the risk of short circuit or open circuit.

[0102] It is understood that in this embodiment, the detection component 300 is located inside the receiving cavity 110, thereby enabling direct detection of parameter information inside the battery cell 10. The first transmission component 700 is located inside the receiving cavity 110 and connected to the detection component 300. The first transmission component 700 is used to generate a first acoustic signal based on the parameter information, so that the first acoustic signal penetrates the shell assembly 100 in a direction away from the electrode assembly, and is used to receive a second acoustic signal that penetrates the shell assembly in a direction towards the electrode assembly. Thus, the parameter information is transmitted outward by means of acoustic waves without the need for destructive operation on the shell assembly 100. This allows communication between the detection component 300 inside the battery cell 10 and other units outside the battery cell 10 while ensuring the airtightness and structural reliability of the battery cell 10, thereby improving the safety of the battery cell 10.

[0103] Accordingly, please refer to Figure 9 , Figure 9 This is a flowchart illustrating a battery cell signal transmission method provided in an embodiment of this application. The battery cell signal transmission method provided in this embodiment specifically includes the following steps:

[0104] Step 801: The detection component 300 inside the shell assembly collects parameter information;

[0105] Step 802: The signal acquisition and processing unit 710 processes the parameter information, determines the information to be transmitted, and transmits the information to be transmitted to the battery management unit 720.

[0106] Step 803: The battery management unit 720 translates the information to be transmitted into a first target signal and sends the first target signal to the first sound wave generator receiver 730.

[0107] Step 804: The first acoustic wave generator receiver 730 generates a first acoustic wave signal based on the first target signal, so that the first acoustic wave signal penetrates the casing assembly and is transmitted to the second acoustic wave generator receiver 810 outside the battery cell.

[0108] Step 805: The second sound wave generator receiver 810 restores the first sound wave signal to the first target signal and sends the first target signal to the wireless communication module 820.

[0109] Step 806: The wireless communication module 820 decodes the received first target signal into a first wireless signal that can be wirelessly transmitted, so as to transmit the first wireless signal to the external control module 20 (i.e., BMS).

[0110] By using the above method, sound waves can penetrate the sealed metal environment, thereby transmitting the parameter information inside the battery cell 10 to the external BMS while ensuring the sealing and reliability of the casing. This allows the external BMS to coordinate and balance the state of multiple battery cells 10.

[0111] Accordingly, please refer to Figure 10 , Figure 10 This is a flowchart illustrating another battery cell signal transmission method provided in this application embodiment. The other battery cell signal transmission method provided in this application embodiment specifically includes the following steps:

[0112] Step 901: The control module 20 acquires the parameter information of all battery cells in the system, analyzes the parameter information, determines the second wireless signal, and sends the second wireless signal to the wireless communication module 820 of the corresponding battery cell.

[0113] Step 902: The wireless communication module 820 corresponding to the battery cell 10 receives the second wireless signal and decodes it into a second target signal, and sends the second target signal to the second sound wave generator receiver 810.

[0114] Step 903: The second acoustic wave generator receiver 810 generates a second acoustic wave signal based on the second target signal, so that the second acoustic wave signal penetrates the casing assembly and is transmitted to the first acoustic wave generator receiver 730 inside the battery cell.

[0115] Step 904: The first acoustic wave generator receiver 730 restores the second acoustic wave signal to the second target signal and sends it to the battery management unit 720.

[0116] Step 905: The battery management unit 720 decodes the received second target signal into a readable signal to control the battery state.

[0117] By using the above scheme, sound waves can penetrate the metal sealed environment, thereby ensuring the sealing and reliability of the casing, and sending the corresponding control commands issued by the external BMS to the battery management unit 720 inside the corresponding battery cell 10, so that the external BMS can coordinate and balance the state of multiple battery cells 10.

[0118] Accordingly, this application also provides a battery pack, which includes at least one battery cell from the foregoing embodiments.

[0119] It is understood that the battery pack in this application embodiment can, while ensuring the airtightness and structural reliability of the battery cells, enable communication between the internal detection components of the battery cells and other external units of the battery cells, thereby improving the safety of the battery cells and extending the battery's service life.

[0120] Accordingly, please refer to Figure 11 , Figure 11 This is a schematic diagram of the energy storage system provided in an embodiment of this application. This application also provides an energy storage system including a battery pack 30 and a control module 20. The battery pack 30 includes at least one battery cell 10 as described in the preceding embodiments. The control module 20 is communicatively connected to the battery cells 10 in the battery pack 30. The control module 20 receives parameter information from each battery cell 10 and adjusts the state of the battery cells 10 based on the parameter information.

[0121] It is understood that in this embodiment of the application, there is no need to set up a secondary battery management unit to manage the battery pack 30, which simplifies the structure of the entire energy storage system. The control module 20 can communicate directly with the battery cell 10 and has a good signal transmission effect, which is conducive to the control module 20's monitoring and overall management of the status of each battery cell 10.

[0122] It should be noted that the various embodiments of this application can be referred to one another, and for some technical features that are not described in detail, please refer to the description in other embodiments.

[0123] The foregoing has provided a detailed description of a battery cell, battery pack, and energy storage system provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: A housing assembly (100) having a receiving cavity (110) for receiving an electrode assembly; A detection component (300) is located within the receiving cavity (110) and is used to detect parameter information of the battery cell; A first transmission component (700) is located within the receiving cavity (110) and connected to the detection component (300); The first transmission component (700) is used to generate a first acoustic signal based on the parameter information, so that the first acoustic signal is transmitted through the shell component (100) in a direction away from the electrode component, and to receive a second acoustic signal transmitted through the shell component (100) in a direction towards the electrode component.

2. The battery cell according to claim 1, characterized in that, The first transmission component (700) includes: A signal acquisition and processing unit (710) is connected to the detection component (300) and is used to process the parameter information to determine the information to be transmitted. A battery management unit (720) is connected to the signal acquisition and processing unit (710) and is used to translate the information to be transmitted into a first target signal; A first acoustic wave generator receiver (730) is connected to the battery management unit (720) and is used to generate the first acoustic wave signal based on the first target signal.

3. The battery cell according to claim 2, characterized in that, The battery cell also includes: A second transmission component (800) is located on the side of the housing assembly (100) facing away from the electrode assembly. The second transmission component (800) is used to receive the first acoustic signal generated by the first transmission component (700).

4. The battery cell according to claim 3, characterized in that, The second transmission component (800) includes: The second sound wave generator and receiver (810) is used to restore the first sound wave signal to the first target signal; A wireless communication module (820) is connected to the second acoustic wave generator receiver (810) and is used to translate the first target signal into a first wireless signal to communicate with the control module (20). The wireless communication module (820) is also used to receive the second wireless signal sent by the control module (20) and decode it into a second target signal, so that the second sound wave generator receiver (810) generates the second sound wave signal based on the second target signal, and the first sound wave generator receiver (730) restores the second sound wave signal to the second target signal and sends it to the battery management unit (720).

5. The battery cell according to claim 4, characterized in that, The housing assembly (100) includes an inner sidewall (140) facing the electrode assembly, the inner sidewall (140) for enclosing the receiving cavity (110); The first sound wave generator (730) is disposed on the inner sidewall (140) along a direction perpendicular to the inner sidewall (140), and the projection of the second sound wave generator (810) on the inner sidewall (140) at least partially overlaps with the first sound wave generator (730).

6. The battery cell according to claim 1, characterized in that, The housing assembly (100) includes an inner sidewall (140) facing the electrode assembly, the inner sidewall (140) forming the receiving cavity (110); the housing assembly (100) has a receiving space (400) having a first opening (410) on the inner sidewall (140), the detection assembly (300) and the first transmission assembly (700) being received in the receiving space (400).

7. The battery cell according to claim 6, characterized in that, The battery cell further includes an insulating component (200), the insulating component (200) including a first insulating portion (210), the first insulating portion (210) being disposed in the receiving space (400) and covering the first opening (410), the first insulating portion (210) covering at least a portion of the detection component (300) and the first transmission component (700).

8. The battery cell according to claim 7, characterized in that, The insulating component (200) further includes a second insulating portion (220), which is connected to the first insulating portion (210) and covers the inner sidewall (140).

9. The battery cell according to claim 1, characterized in that, The housing assembly (100) includes an inner sidewall (140) facing the electrode assembly, the inner sidewall (140) for enclosing the receiving cavity (110); The battery cell also includes an insulating component (200) and a receiving space (400), the insulating component (200) being located in the receiving cavity (110) and connected to the shell assembly (100); The receiving space (400) is formed in the insulating component (200), and the receiving space (400) is located within the insulating component (200); Alternatively, the insulating component (200) has a second opening (420) on the side facing the housing component (100), and the inner sidewall (140) covers the second opening (420).

10. The battery cell according to claim 1, characterized in that, The battery cell also includes: A pole post assembly (500) is disposed on the housing assembly (100); A connection assembly (600) is provided, wherein one end of the pole assembly (500) facing the receiving cavity (110) is connected to the detection assembly (300) and the first transmission assembly (700) via the connection assembly (600).

11. A battery pack, characterized in that, Includes the battery cell (10) as described in any one of claims 1-10.

12. An energy storage system, characterized in that, include: The battery pack (30) as described in claim 11; The control module (20) is communicatively connected to the battery cells (10) in the battery pack (30). The control module (20) is used to receive parameter information of each battery cell (10) and adjust the state of the battery cell (10) based on the parameter information.

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