Single cell and battery pack

Abstract

The utility model discloses a single battery and battery pack, single battery includes: casing, and casing has the accommodation cavity, electrode assembly, electrode assembly is located in the accommodation cavity, and electrode assembly includes the first pole piece, diaphragm and second pole piece of laminated and winding arrangement, and the polarity of first pole piece and second pole piece is opposite, and second pole piece is electrically connected with casing, end cover subassembly, end cover subassembly includes first end cover and first pole, and first end cover is electrically connected with casing and covers and seals the accommodation cavity, and first pole is worn in first end cover and is insulated with first end cover, and first pole is electrically connected with first pole piece, collection subassembly, collection subassembly is located in first end cover, and collection subassembly is electrically connected with first pole and first end cover.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a single cell battery and a battery pack. Background Technology

[0002] Improving the driving range of electric vehicles is one of the most significant technological challenges facing the automotive industry today, and innovation in battery management systems (BMS) is key to overcoming this problem. Among these innovations, wireless BMS offers a viable solution for enhancing vehicle efficiency and reliability, making it a focal point for both automakers and battery suppliers.

[0003] Wireless BMS technology uses a wireless communication scheme to work in conjunction with battery monitoring devices, transmitting voltage, current, and temperature data from each battery cell to the main controller in the system. Compared to traditional BMS transmission methods, wireless BMS offers lower power consumption, greater scalability, fewer cables and connectors, increased overall battery pack energy density, and eliminates the risk of high voltage between master and slave boards. This significantly improves the reliability and accuracy of battery management while reducing overall costs.

[0004] In blade batteries, the data acquisition devices used to collect battery information are connected to the positive and negative terminals at both ends of the casing via wires. This not only makes the wiring complex and troublesome, but also takes up space. Utility Model Content

[0005] The main purpose of this invention is to propose a single-cell battery that aims to solve, to some extent, the technical problem in existing blade batteries where the acquisition device is connected to the positive and negative terminals at both ends of the casing by wires, which is not only complicated and troublesome, but also takes up space.

[0006] To achieve the above objectives, this utility model proposes a single-cell battery, which includes:

[0007] A housing having a receiving cavity;

[0008] An electrode assembly is disposed in the receiving cavity. The electrode assembly includes a first electrode, a diaphragm, and a second electrode that are stacked and wound together. The first electrode and the second electrode have opposite polarities, and the second electrode is electrically connected to the housing.

[0009] An end cap assembly, the end cap assembly including a first end cap and a first pole post, the first end cap being electrically connected to the housing and sealing the receiving cavity, the first pole post passing through the first end cap and being insulated from the first end cap, the first pole post being electrically connected to the first pole piece;

[0010] A data acquisition component is disposed on the first end cap and is electrically connected to the first pole post and the first end cap.

[0011] Optionally, the first end cap is provided with a mounting groove, the acquisition component includes an acquisition plate, at least a portion of the acquisition plate is located in the mounting groove, and the acquisition plate is electrically connected to the first pole post and the first end cap.

[0012] Optionally, the acquisition component further includes a conductive base, which is adapted to the mounting groove, and at least a portion of the conductive base is located within the mounting groove;

[0013] The conductive base is electrically connected to the first end cap, and the acquisition board is electrically connected to the conductive base.

[0014] Optionally, the conductive base is electrically connected to the wall of the mounting groove;

[0015] The conductive base is provided with an assembly groove, the acquisition plate is disposed in the assembly groove, and the acquisition plate is electrically connected to the groove wall of the assembly groove.

[0016] Optionally, the conductive base has a first peripheral wall, the groove wall of the mounting groove has a first side wall, and the first peripheral wall is welded to the first side wall;

[0017] Or / and, the acquisition plate has a second peripheral wall and a second bottom wall, the groove wall of the assembly groove has a second side wall and a third bottom wall, the second peripheral wall is bonded to and insulated from the second side wall, and the second bottom wall is electrically connected to the third bottom wall.

[0018] Optionally, the opening of the mounting groove faces the side of the first end cap that is away from the electrode assembly;

[0019] The acquisition component further includes a first wire, which is disposed on the side of the first end cap facing away from the electrode assembly, and the first wire is electrically connected to the acquisition board and the first electrode post.

[0020] Optionally, the opening of the mounting groove faces the side of the first end cap facing the electrode assembly;

[0021] The acquisition component also includes a second wire, which is disposed on the side of the first end cap facing the electrode assembly. The second wire is electrically connected to the acquisition board and the first electrode post. The acquisition board is provided with a wireless transceiver module.

[0022] Optionally, the end cap assembly further includes a first upper plastic, a first lower plastic and a first sealing ring, wherein the first upper plastic is located on the side of the first end cap facing away from the electrode assembly and is connected to the first end cap, and the first lower plastic is located on the side of the first end cap facing the electrode assembly and is connected to the first end cap.

[0023] The first electrode post includes a first base plate, a first column, and a first end plate. The first base plate is located on the side of the first lower plastic facing the electrode assembly. The first column is electrically connected to the base plate and the end plate, and the first column passes through the first lower plastic, the first end cap, and the first upper plastic. The first end plate is located on the side of the first upper plastic away from the first end cap. The first sealing ring is disposed between the first column and the first end cap.

[0024] Optionally, the housing has a first opening and a second opening disposed opposite to each other, and both the first opening and the second opening communicate with the receiving cavity, and the first end cap covers the first opening;

[0025] The end cap assembly further includes a second end cap and a second pole post. The second end cap is electrically connected to the housing and seals the second opening. The second pole post passes through the second end cap and is electrically connected to the second end cap. The second pole post is electrically connected to the second pole piece.

[0026] This utility model also proposes a battery pack comprising individual batteries as described above.

[0027] In this single-cell battery, the first electrode of the electrode assembly is electrically connected to the first terminal of the end cap assembly. The first terminal passes through the first end cap and is insulated from it. The second electrode, the housing, and the first end cap of the electrode assembly are electrically connected in sequence. The acquisition component is electrically connected to the first end cap and the first terminal, thus forming a circuit. The acquisition component can not only be powered by the electrode assembly, but also collect relevant data of the single-cell battery operation (such as voltage and current) to monitor the battery status information in real time. Since the acquisition component is directly electrically connected to the first end cap, and the first terminal passes through the first end cap and is insulated, the connection of the acquisition module is located on the side of the first end cap. This reduces the inconvenience of laying wires for connection, reduces the number of wires in the acquisition module, simplifies wiring, reduces space occupation, makes the battery structure more compact and reasonable, and improves space utilization. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a single battery cell in one embodiment of the present invention;

[0029] Figure 2 for Figure 1 Exploded view of the end cap assembly of a single battery cell in the embodiment;

[0030] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0031] Figure 4 for Figure 1A schematic diagram of the data acquisition component of a single battery in the embodiment;

[0032] Figure 5 for Figure 1 Exploded view of the data acquisition component of a single battery in the embodiment;

[0033] Figure 6 This is a schematic diagram of the structure of a single battery cell in another embodiment of the present invention;

[0034] Figure 7 for Figure 6 A schematic diagram of the internal structure of a single battery cell in the embodiment;

[0035] Figure 8 for Figure 7 Enlarged view of point B in the middle. Detailed Implementation

[0036] The solutions in the embodiments of this utility model 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 utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0037] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0038] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0039] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0040] This utility model embodiment proposes a single-cell battery. As the basic unit constituting a battery pack, the single-cell battery is an independent electrochemical energy storage device that can convert chemical energy into electrical energy through electrochemical reactions, or convert electrical energy into chemical energy for storage. The single-cell battery can be a square battery and can be applied to electric vehicles and other fields.

[0041] Reference Figure 1 , Figure 6 and Figure 7 The single cell includes:

[0042] Housing 100, housing 100 having receiving cavity 101;

[0043] Electrode assembly 200 is disposed in receiving cavity 101. Electrode assembly 200 includes a first electrode, a diaphragm and a second electrode that are stacked and wound together. The first electrode and the second electrode have opposite polarities. The second electrode is electrically connected to housing 100.

[0044] End cap assembly 300 includes a first end cap 310 and a first pole post 320. The first end cap 310 is electrically connected to the housing 100 and covers the receiving cavity 101. The first pole post 320 passes through the first end cap 310 and is insulated from the first end cap 310. The first pole post 320 is electrically connected to the first pole piece.

[0045] A data acquisition component 400 is disposed on the first end cover 310 and is electrically connected to the first pole post 320 and the first end cover 310.

[0046] In this embodiment, the housing 100 may be made of high-strength, corrosion-resistant metal or composite material, such as... Figure 7 As shown, the housing 100 has a receiving cavity 101 inside. The receiving cavity 101 provides a safe and stable receiving space for the electrode assembly 200, electrolyte, etc., while effectively resisting external impacts and protecting internal components from damage.

[0047] The electrode assembly 200, as the core component for energy storage and release in the battery, is housed within the receiving cavity 101. The type of electrode assembly 200 can be selected according to actual application requirements, such as a lithium-ion electrode assembly 200. The electrode assembly 200 includes a first electrode, a separator, and a second electrode, which are stacked and wound together. One of the first and second electrodes is a positive electrode, and the other is a negative electrode, with opposite polarities. Specifically, the first electrode can be a negative electrode, and the second electrode can be a positive electrode. During operation, the electrode assembly 200 achieves the mutual conversion of electrical energy and chemical energy through a chemical reaction, providing a stable power output to external devices. The second electrode is electrically connected to the housing 100, which can be achieved by a conductive connection structure (such as welding, conductive adhesive bonding, etc.) between the second electrode and the inner wall of the housing 100. Other forms are also possible, including but not limited to these.

[0048] like Figure 1 and Figure 6 As shown, the end cap assembly 300 includes a first end cap 310 and a first terminal post 320. The first end cap 310 is a metal cover plate, which is sealed to the top edge of the housing 100 by welding or other connection methods, sealing the receiving cavity 101 to prevent external moisture, dust, etc. from entering the battery. It also provides a support structure for the installation of the acquisition assembly 400. The first terminal post 320 passes through the first end cap 310, and an insulating component (such as insulating plastic) is provided between it and the first end cap 310 to ensure the insulation between the first terminal post 320 and the first end cap 310 and to avoid short circuits. One end of the first terminal post 320 is electrically connected to the first electrode plate through a conductive connector (such as a conductive sheet), and the other end protrudes from the first end cap 310 and can be used to connect to an external circuit. The first terminal post 320 can be the negative terminal post.

[0049] The data acquisition component 400 can be installed on the outer or inner surface of the first end cover 310, or even partially or completely embedded inside the first end cover 310. It acquires relevant monitoring data through electrical connection with the first electrode post 320 and the first end cover 310. The data acquisition component 400 may include a PCB circuit board and a signal acquisition module. The PCB circuit board can be fixed to the surface of the first end cover 310 or at least partially embedded within it, connected to the end cover using an insulating bracket or thermally conductive adhesive. The board surface is equipped with signal processing circuitry, an analog-to-digital conversion module, and communication interfaces (such as Bluetooth, NFC, or other wireless transmission modules). The signal acquisition module, located on the PCB circuit board, can integrate voltage sensors, current sensors (such as Hall effect sensors), and temperature sensors (such as NTC thermistors) to acquire real-time status data such as battery voltage, current, and temperature. This is merely an example and not a limitation.

[0050] Specifically, when a single battery cell is in operation, electrochemical reactions occur in the electrode assembly 200 during both charging and discharging processes. During discharge, the first and second electrodes undergo oxidation and reduction reactions, respectively, and the generated electrical energy is transferred to the external circuit through the first terminal 320 and the casing 100. During charging, external electrical energy is input to the electrode assembly 200 through the first terminal 320 and the casing 100, causing the first and second electrodes to undergo opposite electrochemical reactions, thereby storing electrical energy.

[0051] Since the first terminal post 320 is insulated from the first end cap 310 and is connected to electrodes of different polarities respectively, the acquisition component 400 can acquire data such as voltage and current between the first terminal post 320 (corresponding to the polarity of the first electrode, such as the negative electrode) and the first end cap 310 (which is electrically connected to the second electrode through the housing 100, corresponding to the polarity of the second electrode, such as the positive electrode) in real time through electrical connection with the first terminal post 320 and the first end cap 310 (corresponding to the polarity of the second electrode, such as the positive electrode) through real time through electrical connection with the first terminal post 320 and the first end cap 310 (which is electrically connected to the second electrode through the housing 100, corresponding to the polarity of the second electrode, such as the positive electrode) through real time through electrical connection with the first end cap 310. This allows for real-time monitoring of the battery's status information, reduces the number of wires required for the acquisition module, simplifies wiring, reduces space occupation, makes the internal structure of the battery more compact and reasonable, and improves space utilization.

[0052] In some embodiments, refer to Figures 2 to 5 The first end cap 310 is provided with a mounting groove 311. The acquisition assembly 400 includes an acquisition plate 410. At least a portion of the acquisition plate 410 is located in the mounting groove 311. The acquisition plate 410 is electrically connected to the first pole post 320 and the first end cap 310.

[0053] In this embodiment, a standardized acquisition module mounting structure is formed by pre-configuring a mounting groove 311 on the first end cover 310 and integrating a data acquisition board 410, thereby optimizing the battery space layout and improving assembly efficiency. Specifically, the surface of the first end cover 310 is recessed with a mounting groove 311 to accommodate the acquisition component 400. The acquisition board 410 of the acquisition component 400 is at least partially located within the mounting groove 311; that is, either a portion or the entire acquisition board 410 may be located within the mounting groove 311. The acquisition board 410 is a PCB circuit board on which components such as a voltage acquisition chip, a temperature sensor, and a communication module can be integrated. The mounting groove 311 may be rectangular, circular, or other adaptable grooves. Its depth and size are determined according to the overall thickness of the acquisition component 400 and the circuit layout design to ensure that the acquisition board 410 is at least partially embedded inside the end cover, forming a semi-embedded or fully embedded mounting structure. When the acquisition board 410 is installed in the mounting groove 311, one side of the acquisition board 410 can be electrically connected to the first pole post 320 through a conductive connector (such as a wire), and the other side can be electrically connected to the first end cover 310 (and thus to the housing 100 and the second pole plate) through the conductive contact points on the inner wall of the mounting groove 311.

[0054] The acquisition board 410 is embedded in the mounting slot 311 of the first end cover 310, eliminating the need for a separate acquisition module bracket inside the battery, reducing the number of components and saving battery space. Furthermore, the standardized mounting slot 311 structure allows for rapid assembly of the acquisition board 410, improving assembly efficiency. In other words, this embodiment achieves a standardized and compact design of the battery monitoring module by deeply integrating the acquisition component 400 into the end cover structure, while maintaining the battery's high energy density.

[0055] In some embodiments, refer to Figures 2 to 5 The acquisition component 400 also includes a conductive base 420, which is adapted to the mounting groove 311, and at least a portion of the conductive base 420 is located within the mounting groove 311.

[0056] The conductive base 420 is electrically connected to the first end cover 310, and the acquisition board 410 is electrically connected to the conductive base 420.

[0057] In this embodiment, by adding a conductive base 420 as an intermediate conductive component, a three-level conductive architecture of "first end cover 310-conductive base 420-acquisition board 410" is constructed, thereby realizing the modular integration of signal acquisition function and improving the reliability of electrical connection.

[0058] The conductive base 420 can be made of a metal material with excellent conductivity (such as copper, aluminum, or a conductive alloy), and its shape precisely matches the contour of the mounting groove 311. Its thickness is adapted to the depth of the mounting groove 311, ensuring that it is flush with, slightly lower than, or slightly higher than the surface of the first end cover 310 after being embedded in the mounting groove 311. That is, a portion or all of the conductive base 420 may be located within the mounting groove 311. For example, the conductive base 420 is housed in the mounting groove 311 and is directly electrically connected to the metal body of the first end cover 310 by welding, conductive adhesive bonding, or pressure contact. The conductive base 420 has conductive contacts or welding pins on the side facing the acquisition board 410 for forming a detachable or permanent electrical connection with the conductive lines of the acquisition board 410. Other connection methods are also possible, including but not limited to these.

[0059] Once the conductive base 420 is embedded in the mounting groove 311 of the first end cover 310 and the electrical connection is completed, its core function is to build a stable signal transmission bridge. Specifically, the potential signal of the first end cover 310 (electrically connected to the housing 100 and the second electrode) is conducted to the acquisition board 410 through the conductive base 420, while the potential signal of the first electrode 320 is directly conducted to the acquisition board 410 through the intermediate conductive connector (such as a wire). The signal processing circuit of the acquisition board 410 processes the potential signal accordingly.

[0060] In some embodiments, refer to Figures 2 to 5The conductive base 420 is electrically connected to the wall of the mounting groove 311;

[0061] The conductive base 420 is provided with an assembly groove 421, and the acquisition plate 410 is disposed in the assembly groove 421. The acquisition plate 410 is electrically connected to the groove wall of the assembly groove 421.

[0062] In this embodiment, the conductive base 420 can be annular or frame-shaped, with a conductive layer (such as an electroplated copper layer or a conductive adhesive layer) on its outer surface, which is tightly fitted to the wall of the mounting groove 311 of the first end cover 310, forming a circumferential conductive connection with the wall of the mounting groove 311 through an interference fit or welding process. The inner side of the conductive base 420 is provided with a recessed assembly groove 421 adapted to the acquisition plate 410, and the acquisition plate 410 is accommodated in the assembly groove 421. The groove wall (such as the bottom wall) of the assembly groove 421 of the conductive base 420 can be provided with a conductive structure (such as a conductive coating), and the bottom of the acquisition plate 410 is provided with corresponding conductive contacts or conductive pads, forming a contact connection with the conductive structure of the groove wall of the assembly groove 421 through a pressing process or reflow soldering process.

[0063] In this embodiment, the conductive base 420 achieves both mechanical positioning and electrical conduction through the annular engagement between its outer wall and the wall of the mounting groove 311, avoiding uneven force distribution at a single point of connection. Furthermore, the acquisition plate 410 is embedded in the assembly groove 421 of the conductive base 420 and contacts the groove wall for electrical connection, forming a stable covering structure of the conductive base 420 over the acquisition plate 410. This improves conductivity reliability while achieving three-dimensional integration of the acquisition component 400.

[0064] In some embodiments, refer to Figures 3 to 5 The conductive base 420 has a first peripheral wall 4201, and the groove wall of the mounting groove 311 has a first side wall 3111. The first peripheral wall 4201 is welded to the first side wall 3111.

[0065] In some embodiments, such as Figure 5 As shown, the acquisition plate 410 has a second peripheral wall 4101 and a second bottom wall, and the groove wall of the assembly groove 421 has a second side wall 4211 and a third bottom wall 4212. The second peripheral wall 4101 is bonded to and insulated from the second side wall 4211, and the second bottom wall is electrically connected to the third bottom wall 4212.

[0066] In this embodiment, the conductive base 420 and the mounting groove 311 may have corresponding first peripheral wall 4201 and first side wall 3111. When the conductive base 420 is accommodated in the mounting groove 311, the first peripheral wall 4201 of the conductive base 420 and the first side wall 3111 of the mounting groove 311 are tightly fitted. By welding the two together, a stable connection is achieved while realizing electrical conduction.

[0067] The acquisition plate 410 and the assembly groove 421 may have corresponding second peripheral walls 4101 and second side walls 4211, and second bottom walls and third bottom walls 4212. When the acquisition plate 410 is housed in the assembly groove 421, the second peripheral wall 4101 of the acquisition plate 410 and the second side wall 4211 of the assembly groove 421 are tightly fitted together, bonding and insulating them, for example, using epoxy resin insulating adhesive. At the same time, the second bottom wall of the acquisition plate 410 and the third bottom wall 4212 of the assembly groove 421 are in close contact to achieve electrical connection.

[0068] In some embodiments, refer to Figure 1 and Figure 2 The groove of the mounting slot 311 faces the side of the first end cover 310 that is away from the electrode assembly 200;

[0069] The acquisition component 400 also includes a first wire 430, which is disposed on the side of the first end cover 310 facing away from the electrode assembly 200. The first wire 430 is electrically connected to the acquisition board 410 and the first electrode post 320.

[0070] In this embodiment, the surface of the first end cap 310 facing away from the electrode assembly 200 is recessed with an external mounting groove 311, the opening of which is exposed on the outer surface of the first end cap 310. During assembly, the first end cap 310 can be first installed on the housing 100, and then the conductive base 420 and the acquisition plate 410 of the acquisition assembly 400 can be directly installed into the mounting groove 311 from the outside of the first end cap 310 through the opening of the mounting groove 311. This layout allows the installation, debugging, and maintenance of the acquisition assembly 400 without disassembling the internal structure of the battery, significantly reducing operational complexity. Furthermore, the open design of the mounting groove 311 allows the acquisition assembly 400 to be installed independently in the later stages of battery assembly, avoiding interference with processes such as electrode assembly 200 assembly and electrolyte filling.

[0071] like Figure 1 As shown, the acquisition component 400 also includes a first conductor 430. The acquisition board 410 is connected to the first terminal 320 via the first conductor 430, and the potential signal of the first terminal 320 is directly transmitted to the acquisition board 410 via the first conductor 430. The first conductor 430 can be wrapped with an outer sheath to insulate it from the first end cap 310 and prevent short circuits. To prevent the conductor from becoming loose, the first conductor 430 can be attached to the first end cap 310 with adhesive tape or glue, or it can be sealed between the end cap patch and the first end cap 310 with an end cap patch.

[0072] This embodiment improves assembly efficiency and signal acquisition reliability by externalizing the acquisition component 400 and optimizing the wire connection path, thereby simplifying the internal structure of the battery.

[0073] In some embodiments, refer to Figures 6 to 8 The slot opening of the mounting groove 311 faces the side of the first end cover 310 facing the electrode assembly 200;

[0074] The acquisition component 400 also includes a second wire 440, which is disposed on the side of the first end cap 310 facing the electrode assembly 200. The second wire 440 is electrically connected to the acquisition board 410 and the first electrode post 320. The acquisition board 410 is provided with a wireless transceiver module.

[0075] In this embodiment, the surface of the first end cap 310 facing the electrode assembly 200 is recessed with a built-in mounting groove 311. The opening of the mounting groove 311 is exposed on the inner surface of the first end cap 310. During assembly, the conductive base 420 of the acquisition assembly 400 and the acquisition plate 410 can be installed in the mounting base groove through the opening of the mounting groove 311, and then the first end cap 310 is placed on the housing 100. This layout allows the acquisition assembly 400 to be completely hidden inside the first end cap 310, isolated from the outside, thereby reducing the influence of external factors on the acquisition circuit.

[0076] like Figure 8 As shown, the acquisition component 400 also includes a second wire 440. The acquisition board 410 is connected to the first terminal 320 via the second wire 440, and the potential signal of the first terminal 320 is directly transmitted to the acquisition board 410 via the second wire 440. The second wire 440 can be wrapped with an outer sheath to insulate it from the first end cap 310 and prevent short circuits. To prevent the wire from loosening, the second wire 440 can be attached to the first end cap 310 with adhesive tape or glue, or it can be sealed between the end cap patch and the first end cap 310 with an end cap patch. The acquisition board 410 integrates a miniaturized wireless transceiver module, which communicates with external devices (such as the battery management system of the battery pack) through the wireless transceiver module. For example, after the acquisition board 410 completes the acquisition of data such as voltage, current, and temperature, the wireless transceiver module encodes the data and transmits it to the battery management system in the battery pack as a wireless signal through the antenna.

[0077] This embodiment integrates the acquisition component 400 inside the battery and integrates wireless transmission functionality, thereby achieving efficient wireless transmission of battery status data while ensuring battery sealing and structural compactness.

[0078] In some embodiments, refer to Figure 2 The end cap assembly 300 also includes a first upper plastic 330, a first lower plastic 340 and a first sealing ring 350. The first upper plastic 330 is located on the side of the first end cap 310 facing away from the electrode assembly 200 and is connected to the first end cap 310. The first lower plastic 340 is located on the side of the first end cap 310 facing the electrode assembly 200 and is connected to the first end cap 310.

[0079] The first electrode post 320 includes a first base plate 321, a first post 322, and a first end plate 323. The first base plate 321 is located on the side of the first lower plastic 340 facing the electrode assembly 200. The first post 322 is electrically connected to the first base plate 321 and the first end plate 323, and the first post 322 passes through the first lower plastic 340, the first end cap 310, and the first upper plastic 330. The first end plate 323 is located on the side of the first upper plastic 330 away from the first end cap 310. The first sealing ring 350 is disposed between the first post 322 and the first end cap 310.

[0080] In this embodiment, the first upper plastic 330 is injection molded from a high-strength engineering plastic with excellent insulation properties, and is fixedly connected to the first end cap 310 via a pre-set snap-fit ​​or ultrasonic welding process. The first upper plastic 330 has a through hole that matches the first pillar 322 of the first pole post 320. The hole wall is smooth and has a certain tolerance to ensure that the first pillar 322 can pass through smoothly and maintain coaxiality. The first upper plastic 330 can be made of insulating plastic to achieve insulation between the first pole post 320 and the first end cap 310.

[0081] The first lower plastic 340 is also made of high-temperature resistant and electrolyte-corrosion-resistant engineering plastic, and its structural design is adapted to the outline and size of the first end cap 310. The first lower plastic 340 is fitted with the positioning holes on the inner side of the first end cap 310 through positioning pins and is fixed by hot melt welding or bonding. The side of the first lower plastic 340 facing the electrode assembly 200 has a groove for fixing the base plate 321 of the first electrode post 320. Conductive contact pieces are arranged in the groove to achieve a reliable electrical connection between the first base plate 321 and the electrode assembly 200.

[0082] The first terminal post 320 is integrally formed or spliced ​​from a first base plate 321, a first post 322, and a first end plate 323, and is made of highly conductive copper alloy or aluminum alloy. The surface of the first base plate 321 of the first terminal post 320 is provided with raised conductive contacts, which are in close contact with the conductive contact piece in the first lower plastic 340; the first post 322 is a hollow or solid cylindrical structure, and its surface can be plated with nickel or gold to enhance its oxidation resistance; the first end plate 323 is square plate-shaped, with an outer diameter larger than that of the first post 322, and is fitted onto the first upper plastic 330 and connected to the first post 322 for external circuit connection.

[0083] The first sealing ring 350 is an O-ring made of fluororubber or silicone rubber, and its cross-sectional diameter is adapted to the gap between the first post 322 and the through hole of the first end cap 310. The first sealing ring 350 can be installed in the through hole of the first end cap 310. When the first electrode post 320 passes through, the first sealing ring 350 is compressed by the first post 322 and undergoes elastic deformation, forming an annular sealing surface between the first post 322 and the first end cap 310, preventing electrolyte leakage and external moisture intrusion.

[0084] During battery assembly, the first base plate 321 of the first terminal post 320 is embedded in the groove of the first lower plastic 340, and the conductive contacts are tightly fitted with the conductive contact pieces, establishing an electrical connection with the first electrode plate of the electrode assembly 200. The first post 322 passes through the through holes of the first lower plastic 340, the first end cap 310, and the first upper plastic 330 in sequence, and finally connects with the first end plate 323 on the outside of the first upper plastic 330. The first upper plastic 330 and the first lower plastic 340 are mechanically connected to firmly clamp the first terminal post 320, restricting its displacement and ensuring that the first terminal post 320 maintains a stable connection state under conditions such as battery charging and discharging expansion and vibration. The first sealing ring 350 forms a physical sealing barrier between the first post 322 and the first end cap 310. As the internal pressure of the battery changes, the elastic deformation of the first sealing ring 350 can adaptively compensate for the gap change and maintain the sealing performance. Meanwhile, the first upper plastic 330 and the first lower plastic 340 serve as insulating components, isolating the first terminal 320 from the metal body of the first end cap 310 to achieve insulation. In this embodiment, the combination design of the plastic components and the sealing structure achieves stable installation, electrical isolation, and waterproof sealing of the first terminal 320, thereby improving the safety and reliability of the single battery cell.

[0085] In some embodiments, refer to Figure 6 The housing 100 has a first opening and a second opening that are disposed opposite to each other, and both the first opening and the second opening are in communication with the receiving cavity 101. The first end cap 310 covers the first opening.

[0086] The end cap assembly 300 also includes a second end cap 360 and a second pole post 370. The second end cap 360 is electrically connected to the housing 100 and seals the second opening. The second pole post 370 passes through the second end cap 360 and is electrically connected to the second end cap 360. The second pole post 370 is electrically connected to the second pole piece.

[0087] In this embodiment, the housing 100 adopts a cuboid structure with a first opening and a second opening at both ends along its Z-direction, the opening sizes of which are adapted to the end cap. The end cap assembly 300 also includes a second end cap 360 and a second terminal post 370. The second end cap 360 adopts a design similar to the first end cap 310, is made of conductive metal, and covers the second opening and the first opening, respectively, along with the first end cap 310. The second end cap 360 is sealed to the bottom edge of the housing 100 by welding or other connection methods, sealing the accommodating cavity and preventing external moisture, dust, etc., from entering the battery. The second terminal post 370 passes through the second end cap 360 and is electrically conductive to the second end cap 360. Furthermore, one end of the second terminal post 370 is electrically connected to the second electrode plate through a conductive connector (such as a conductive sheet), and the other end protrudes from the second end cap 360, which can be used to connect to an external circuit. The second terminal post 370 can be a positive terminal post. When the acquisition component 400 acquires the battery status information, the relevant signals of the second electrode can be transmitted to the acquisition component 400 in sequence through the second electrode post 370, the second end cap 360, the housing 100, and the first end cap 310. Optionally, the second electrode post 370 has a structure that is roughly the same as that of the first electrode post 320. For example, the second electrode post 370 also adopts a structure design of a second base plate, a second column, and a second end plate. The end cap assembly 300 also includes a second upper plastic, a second lower plastic, and a second sealing ring. The second upper plastic is located on the side of the second end cap 360 facing away from the electrode assembly 200 and is connected to the second end cap 360. The second lower plastic is located on the side of the second end cap 360 facing the electrode assembly 200 and is connected to the second end cap 360. The second base plate is located on the side of the second lower plastic facing the electrode assembly 200. The second column is electrically connected to the second base plate and the second end plate, and the second column passes through the second lower plastic, the second end cap 360, and the second upper plastic. The second end cap 360 is located on the side of the second upper plastic away from the second end cap 360. The second sealing ring is located between the second column and the second end cap 360. The second upper plastic can be made of conductive plastic to achieve electrical connection between the second electrode post 370 and the second end cap 360. In this embodiment, a symmetrical electrode output system is constructed through a double-ended opening and bipolar post structure design, optimizing the internal current conduction path of the battery and improving the battery's charge and discharge performance and structural stability.

[0088] This utility model embodiment also proposes a battery pack, which includes a single battery cell as described in the foregoing embodiments. The specific structure of the single battery cell is as described in the foregoing embodiments. Since this battery pack adopts all the technical solutions of all the foregoing embodiments, it has at least all the technical effects brought about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0089] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A single-cell battery, characterized in that, include: A housing (100) having a receiving cavity (101); Electrode assembly (200), the electrode assembly (200) is disposed in the receiving cavity (101), the electrode assembly (200) includes a first electrode, a diaphragm and a second electrode stacked and wound together, the first electrode and the second electrode have opposite polarities, and the second electrode is electrically connected to the housing (100); An end cap assembly (300) includes a first end cap (310) and a first pole post (320). The first end cap (310) is electrically connected to the housing (100) and covers the receiving cavity (101). The first pole post (320) passes through the first end cap (310) and is insulated from the first end cap (310). The first pole post (320) is electrically connected to the first pole piece. A data acquisition component (400) is disposed on the first end cap (310) and is electrically connected to the first pole post (320) and the first end cap (310).

2. The single-cell battery according to claim 1, characterized in that, The first end cap (310) is provided with a mounting groove (311), and the acquisition component (400) includes an acquisition plate (410), at least a portion of which is located in the mounting groove (311), and the acquisition plate (410) is electrically connected to the first pole post (320) and the first end cap (310).

3. The single-cell battery according to claim 2, characterized in that, The acquisition component (400) further includes a conductive base (420) that is adapted to the mounting groove (311), and at least a portion of the conductive base (420) is located within the mounting groove (311). The conductive base (420) is electrically connected to the first end cap (310), and the acquisition board (410) is electrically connected to the conductive base (420).

4. The single-cell battery according to claim 3, characterized in that, The conductive base (420) is electrically connected to the wall of the mounting groove (311); The conductive base (420) is provided with an assembly groove (421), and the acquisition plate (410) is disposed in the assembly groove (421). The acquisition plate (410) is electrically connected to the groove wall of the assembly groove (421).

5. The single-cell battery according to claim 4, characterized in that, The conductive base (420) has a first peripheral wall (4201), and the groove wall of the mounting groove (311) has a first side wall (3111). The first peripheral wall (4201) is welded to the first side wall (3111). Or / and, the acquisition plate (410) has a second peripheral wall (4101) and a second bottom wall, the groove wall of the assembly groove (421) has a second side wall (4211) and a third bottom wall (4212), the second peripheral wall (4101) is bonded to and insulated from the second side wall (4211), and the second bottom wall is electrically connected to the third bottom wall (4212).

6. The single-cell battery according to claim 3, characterized in that, The opening of the mounting groove (311) faces the side of the first end cap (310) away from the electrode assembly (200); The acquisition component (400) further includes a first wire (430), which is disposed on the side of the first end cap (310) facing away from the electrode assembly (200) and electrically connects the acquisition plate (410) and the first electrode post (320).

7. The single-cell battery according to claim 3, characterized in that, The opening of the mounting groove (311) faces the side of the first end cap (310) facing the electrode assembly (200); The acquisition component (400) further includes a second wire (440), which is disposed on the side of the first end cap (310) facing the electrode assembly (200). The second wire (440) is electrically connected to the acquisition board (410) and the first electrode post (320). The acquisition board (410) is provided with a wireless transceiver module.

8. The single-cell battery according to claim 7, characterized in that, The end cap assembly (300) further includes a first upper plastic (330), a first lower plastic (340), and a first sealing ring (350). The first upper plastic (330) is located on the side of the first end cap (310) facing away from the electrode assembly (200) and is connected to the first end cap (310). The first lower plastic (340) is located on the side of the first end cap (310) facing the electrode assembly (200) and is connected to the first end cap (310). The first electrode post (320) includes a first base plate (321), a first column (322), and a first end plate (323). The first base plate (321) is located on the side of the first lower plastic (340) facing the electrode assembly (200). The first column (322) is electrically connected to the first base plate (321) and the first end plate (323). The first column (322) passes through the first lower plastic (340), the first end cap (310), and the first upper plastic (330). The first end plate (323) is located on the side of the first upper plastic (330) away from the first end cap (310). The first sealing ring (350) is disposed between the first column (322) and the first end cap (310).

9. The single-cell battery according to any one of claims 1 to 8, characterized in that, The housing (100) has a first opening and a second opening disposed opposite to each other, and both the first opening and the second opening are in communication with the receiving cavity (101), and the first end cap (310) covers the first opening; The end cap assembly (300) further includes a second end cap (360) and a second pole post (370). The second end cap (360) is electrically connected to the housing (100) and seals the second opening. The second pole post (370) passes through the second end cap (360) and is electrically connected to the second end cap (360). The second pole post (370) is electrically connected to the second pole piece.

10. A battery pack, characterized in that, Including the single cell battery as described in any one of claims 1 to 9.

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