Battery cell and battery pack

Abstract

Provided in the present application are a battery cell and a battery pack. The battery cell comprises: a housing; a top cover, which comprises a cover body, a positive terminal and a negative terminal, wherein the positive terminal and the negative terminal are both connected to the cover body, and the cover body is connected to the housing and defines a cavity; a core, which is arranged in the cavity and comprises a positive main tab, a negative main tab, a positive auxiliary tab and a negative auxiliary tab, wherein the positive main tab is electrically connected to the positive terminal, and the negative main tab is electrically connected to the negative terminal; and a detection device, which is connected to the cover body, wherein the positive auxiliary tab and the negative auxiliary tab are both electrically connected to the detection device. The battery cell of the present application can simplify the battery structure, thereby improving the energy density of the battery.

Description

A single battery and a battery pack

[0001] Cross-references to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202410507843.4, filed on April 25, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of new energy technology, and in particular to a single battery cell and a battery pack. Background Technology

[0004] In related technologies, battery management systems are typically required to monitor and manage batteries in power devices such as electric vehicles and power tools to ensure their safety and stability. Some testing devices need to detect parameters such as battery temperature, air pressure, and current, and transmit this data to a chip for analysis, enabling failure warning and management. Existing power supply and voltage acquisition methods involve welding nickel plates to both ends of the terminals to draw power from a circuit board to supply power to the testing device. This results in a redundant and complex cell structure, which is not only detrimental to battery installation and assembly, but also requires long lead wires to draw power from the terminals via nickel plates. This reduces the accuracy of the test data and occupies more space, thus lowering energy density.

[0005] Summary of the Invention

[0006] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a single-cell battery that can simplify the battery structure and increase the battery's energy density.

[0007] This application also proposes a battery pack.

[0008] A single-cell battery according to a first aspect embodiment of this application includes: a casing; a top cover, the top cover including a cover body, a positive terminal and a negative terminal, the positive terminal and the negative terminal being connected to the cover body, the cover body being connected to the casing and defining a cavity; a cell, the cell being disposed in the cavity, the cell including a positive main electrode, a negative main electrode, a positive secondary electrode, and a negative secondary electrode, the positive main electrode being electrically connected to the positive terminal, and the negative main electrode being electrically connected to the negative terminal; and a detection device, the detection device being connected to the cover body, the positive secondary electrode and the negative secondary electrode being electrically connected to the detection device.

[0009] The single-cell battery according to the first embodiment of this application has at least the following beneficial effects: By providing positive and negative tabs on the cell, when the detection device is electrically connected to the cell, it is not necessary to connect it from the positive and negative main tabs or the positive and negative terminals. Since the positions of the positive and negative terminals on the cover are fixed, and the positions of the positive and negative main tabs need to correspond to the positions of the positive and negative terminals, the positions of the positive and negative main tabs cannot be flexibly adjusted. Furthermore, the distance between the detection device and the positive and negative main tabs via wires is relatively far, hence the need for positive and negative tabs. By adjusting the positions of the positive and negative tabs, the detection device and the cell can be connected at a closer distance, resulting in a smaller space occupied by the connection between the detection device and the cell, thus improving the energy density of the battery. Moreover, it eliminates the need for long wires, simplifying the battery structure.

[0010] According to some embodiments of this application, the top cover further includes a positive terminal and a negative terminal, both of which penetrate the cover body. The end of the positive terminal away from the battery cell is connected to the detection device, the end of the positive terminal close to the battery cell is connected to the positive and negative tabs, the end of the negative terminal away from the battery cell is connected to the detection device, and the end of the negative terminal close to the battery cell is connected to the negative and negative tabs.

[0011] According to some embodiments of this application, the top cover includes two positive terminals and two negative terminals, and the battery cell includes two positive and two negative tabs. The two positive terminals and the two positive and two negative tabs are connected in a one-to-one correspondence, and the two negative terminals and the two negative tabs are connected in a one-to-one correspondence.

[0012] According to some embodiments of this application, the detection device covers the side of the cover opposite to the battery cell, and the detection device covers one end of the positive terminal and the negative terminal.

[0013] According to some embodiments of this application, the positive terminal and the negative terminal are spaced apart along the length direction of the current collector on the battery cell.

[0014] According to some embodiments of this application, a groove is provided on the side of the cover facing away from the battery cell, and the detection device is disposed in the groove.

[0015] According to some embodiments of this application, a through hole is provided at the bottom of the groove, and the two positive terminals and the two negative terminals are respectively disposed in different through holes.

[0016] According to some embodiments of this application, both the positive terminal and the negative terminal include a conductor and an insulating sleeve. The insulating sleeve is fitted around the outer periphery of the conductor to insulate the conductor from the cover. One end of the conductor exposed in the groove is connected to the detection device, and the end of the conductor near the battery cell is electrically connected to the battery cell.

[0017] According to some embodiments of this application, a metal foil is further provided at one end of the conductor near the battery cell, the metal foil on the positive terminal post is connected to the positive and negative terminals, and the metal foil on the negative terminal post is connected to the negative and negative terminals.

[0018] According to some embodiments of this application, the foil on the positive electrode post is an aluminum foil, and the foil on the negative electrode post is a copper foil.

[0019] According to some embodiments of this application, the cover is further provided with a detection hole penetrating the cover. The detection device includes a pressure sensor and a temperature sensor, which are disposed in the detection hole. The pressure sensor is used to measure the pressure inside the cavity, and the temperature sensor is used to measure the temperature inside the cavity. The detection device covers the end of the detection hole away from the battery cell, and a sealing ring is provided on the detection hole to seal between the detection hole and the cover.

[0020] According to some embodiments of this application, the detection device includes a circuit board and a chip, the circuit board covering the cover, and the chip disposed on the side of the circuit board away from the battery cell.

[0021] The battery pack according to a second aspect of this application includes the single battery cells described in any of the above embodiments.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0023] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 is a schematic diagram of the structure of a single battery cell in one embodiment of this application;

[0025] Figure 2 is an explosion diagram of a single cell in one embodiment of this application;

[0026] Figure 3 is an enlarged schematic diagram of the detection device area in Figure 2;

[0027] Figure 4 is a schematic diagram of the pole structure in some embodiments of this application.

[0028] Reference numerals: 1. Battery cell; 11. Body; 12. Positive main electrode; 13. Negative main electrode; 14. First positive secondary electrode; 15. Second positive secondary electrode; 16. First negative secondary electrode; 17. Second negative secondary electrode; 2. Top cover; 21. Cover body; 211. Groove; 212. Through hole; 213. Detection hole; 22. Positive terminal; 23. Negative terminal; 24. First positive secondary electrode post; 241. Conductor; 242. Insulating sleeve; 243. Metal foil; 25. Second positive secondary electrode post; 26. First negative secondary electrode post; 27. Second negative secondary electrode post; 28. Detection device; 281. Circuit board; 282. Chip; 3. Housing; 4. Sealing ring. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0030] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0031] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0033] Referring to Figures 1, 2, and 3, a single-cell battery according to a first aspect embodiment of this application includes: a cell 1 and a top cover 2. The cell 1 includes a main body, on which are connected a positive main electrode 12, a negative main electrode 13, a first positive secondary electrode 14, a second positive secondary electrode 15, a first negative secondary electrode 16, and a second negative secondary electrode 17. The top cover 2 includes a cover body 21 and positive terminals 22 and 23, a first positive secondary electrode post 24, a second positive secondary electrode post 25, a first negative secondary electrode post 26, and a second negative secondary electrode post 27 extending through both sides of the cover body 21. 7 and the detection device 28, the first positive sub-terminal 24, the second positive sub-terminal 25, the first negative sub-terminal 26 and the second negative sub-terminal 27 are all connected to the detection device 28; the positive main electrode tab 12 is connected to the positive terminal 22; the negative main electrode tab 13 is connected to the negative terminal 23; the first positive sub-terminal tab 14 is connected to the first positive sub-terminal 24; the second positive sub-terminal tab 15 is connected to the second positive sub-terminal 25; the first negative sub-terminal tab 16 is connected to the first negative sub-terminal 26; the second negative sub-terminal tab 17 is connected to the second negative sub-terminal 27. Among them, the positive main electrode tab 12 is connected to the positive terminal 22, and the negative main electrode tab 13 is connected to the negative terminal 23. The positive terminal 22 and the negative terminal 23 are exposed on the side of the cover 21 facing away from the cell 1, forming the positive and negative terminals of the battery.

[0034] The first positive secondary terminal 24 and the second positive secondary terminal 25 are both positive terminals, and the first negative secondary terminal 26 and the second negative secondary terminal 27 are both negative terminals. When the detection device 28 detects the voltage and current of the battery cell 1, it requires a pair of pins; therefore, only one positive terminal and one negative terminal can be provided, along with one positive and one negative tab. When detecting the impedance of the battery cell 1, four pins are required: two positive terminals and two negative terminals, namely the first positive secondary terminal 24, the second positive secondary terminal 25, the first negative secondary terminal 26, the second negative secondary terminal 27, and the detection device 28. Correspondingly, two positive and two negative tabs are provided: the first positive secondary tab 14, the second positive secondary tab 15, the first negative secondary tab 16, and the second negative secondary tab 17.

[0035] When setting the top cover, the positive and negative terminals can be omitted, and the positive and negative terminals on the battery cell 1 can be directly connected to the detection device 28. However, directly connecting the positive and negative terminals to the detection device 28 results in an inefficient structure and makes operation difficult. Therefore, the positive and negative terminals are set on the cover 21 to facilitate the connection between the detection device 28 and the battery cell 1.

[0036] In related technologies, the detection device 28 on the cover plate is connected to the positive terminal 22 and the negative terminal 23 via wires. This wire arrangement not only complicates the overall battery structure but also occupies a significant amount of battery space, reducing energy density. In these technologies, the positive terminal 22 and the negative terminal 23 are the ports through which the battery supplies power to the outside. When positioning the positive and negative terminals, they are typically placed far apart. This distance between the positive and negative terminals is primarily for safety and performance considerations. First, from a safety perspective, this distance prevents internal short circuits. If the positive and negative terminals are too close, during battery use, especially under high load or high temperature conditions, the internal materials may come into contact due to thermal expansion or chemical reactions, leading to short circuits and thermal runaway, potentially causing a fire or explosion. Second, from a performance perspective, this distance increases the battery's energy density and power density. A battery's energy density and power density determine the amount of energy it can store and release, as well as the rate of energy release. If the positive and negative electrodes are too close, the battery's size and weight will be limited, thus restricting its energy and power density. Placing the positive and negative electrodes further apart allows for increased size and weight while maintaining battery safety, thereby improving energy and power density. Finally, placing the positive and negative electrodes further apart also helps extend battery life. If the positive and negative electrodes are too close, the internal chemical reactions may be too vigorous, shortening the battery's lifespan. Placing them further apart slows down the rate of these internal chemical reactions, thus extending battery life. In conclusion, placing the positive and negative electrodes further apart ensures battery safety, improves battery performance, and extends battery life.

[0037] In this design, two positive and two negative tabs are re-leading out from the body 11 of the battery cell 1, namely, the first positive tab 14, the second positive tab 15, the first negative tab 16, and the second negative tab 17. The repositioning of the first positive tab 14, the second positive tab 15, the first negative tab 16, and the second negative tab 17 offers great flexibility. Their positions on the battery cell 1 can correspond to the positions of the pins of the electrical connection of the detection device 28, thus eliminating the need for lead wires. Only new terminals penetrating both sides of the cover 21 are required, namely, the first positive tab 24, the second positive tab 25, the first negative tab 26, and the second negative tab 27. The positions of the first positive auxiliary terminal 24, the second positive auxiliary terminal 25, the first negative auxiliary terminal 26, and the second negative auxiliary terminal 27 on the cover 21 correspond to the positions of the pins on the detection device 28, thus greatly shortening the connection distance with the detection device 28. The positions of the first positive auxiliary terminal tab 14, the second positive auxiliary terminal tab 15, the first negative auxiliary terminal tab 16, and the second negative auxiliary terminal tab 17 on the cell 1 are also set according to the positions of the first positive auxiliary terminal 24, the second positive auxiliary terminal 25, the first negative auxiliary terminal 26, and the second negative auxiliary terminal 27, allowing one end of the four newly set terminals to be directly connected to the tabs on the cell 1, and the other end to be directly connected to the detection device 28. This not only eliminates the redundant wire structure in the battery structure but also reduces the space occupied by the connection between the detection device 28 and the cell 1, thereby improving the energy density of the battery.

[0038] When the detection device 28 tests the impedance of cell 1, it requires four pins: the first positive sub-terminal 24, the second positive sub-terminal 25, the first negative sub-terminal 26, and the second negative sub-terminal 27. In related technologies, connecting these four pins involves the use of connectors such as nickel strips, which reduces the detection accuracy of the detection device 28. In this solution, the pins are directly connected to the tabs on cell 1, reducing the need for intermediate connectors and improving the accuracy of impedance detection for cell 1.

[0039] Furthermore, the detection device 28 covers the side of the cover 21 facing away from the battery cell 1, and covers one end of the first positive sub-terminal 24, the second positive sub-terminal 25, the first negative sub-terminal 26, and the second negative sub-terminal 27. By directly covering the first positive sub-terminal 24, the second positive sub-terminal 25, the first negative sub-terminal 26, and the second negative sub-terminal 27 with the detection device 28, the first positive sub-terminal 24, the second positive sub-terminal 25, the first negative sub-terminal 26, and the second negative sub-terminal 27 can be directly connected to the corresponding pins on the detection device 28 after extending from the cover 21, without the need for further connection via leads. Simultaneously, the detection device 28 presses against one end of the first positive sub-terminal 24, the second positive sub-terminal 25, the first negative sub-terminal 26, and the second negative sub-terminal 27, allowing one end of each terminal to abut against the corresponding pin without requiring welding or other fixing connections. This simplifies the manufacturing process and the structure of the top cover 2. It also makes the detection device 28 easier to install and remove, while simultaneously improving the battery's energy density.

[0040] Furthermore, when setting the positive and negative terminals, they are spaced apart along the length of the current collector on cell 1. This prevents the tabs of cell 1 from contacting each other after bending and connecting to the terminals, thus avoiding short circuits. By spacing them along the length of the current collector, the arrangement direction of the positive and negative terminals is perpendicular to the bending direction of the tabs, preventing interference between the tabs.

[0041] A groove 211 is provided on the side of the cover 21 facing away from the battery cell 1, and the detection device 28 is disposed within the groove 211. The groove 211 allows for better positioning of the detection device 28, making its connection to the cover 21 more secure. The detection device 28 can be fixedly connected to the groove 211 by snap-fit, or by applying adhesive or other means to further secure it. The groove 211 reduces the protrusion height of the detection device 28, bringing it closer to the battery cell 1 and shortening the connection length between them, thus further improving the battery's energy density. Furthermore, the side of the detection device 28 facing away from the battery cell 1 is flush with the side of the cover 21 facing away from the battery cell 1, meaning the thickness of the detection device 28 is equal to the depth of the groove 211. This makes the side of the top cover 2 facing away from the battery cell 1 even flatter.

[0042] At least four through holes 212 are provided at the bottom of the groove 211. The first positive sub-terminal 24, the second positive sub-terminal 25, the first negative sub-terminal 26, and the second negative sub-terminal 27 are respectively disposed in the through holes 212. By placing the first positive sub-terminal 24, the second positive sub-terminal 25, the first negative sub-terminal 26, and the second negative sub-terminal 27 at the position of the groove 211, since the groove 211 is the thinnest part of the cover 21, the length of the first positive sub-terminal 24, the second positive sub-terminal 25, the first negative sub-terminal 26, and the second negative sub-terminal 27 can be shortened, thereby further improving the energy density of the battery.

[0043] Referring to Figure 4, the first positive sub-terminal 24, the second positive sub-terminal 25, the first negative sub-terminal 26, and the second negative sub-terminal 27 each include a conductor 241 and an insulating sleeve 242. The insulating sleeve 242 is fitted onto the conductor 241 so that the conductor 241 penetrates the cover 21 and is insulated from the cover 21. One end of the conductor 241 exposed in the groove 211 is connected to the detection device 28, and the end of the conductor 241 near the battery cell 1 is connected to the battery cell 1. The insulating sleeve 242 is first fitted onto the conductor 241, and then both are placed together in the through hole 212, which provides better insulation between the conductor 241 and the cover.

[0044] A metal foil 243 is also provided at the end of conductor 241 near cell 1. By providing the metal foil 243 at the end of conductor 241 near cell 1, it is possible to better connect with the tabs on cell 1. When the top cover 2 is not soldered to cell 1, conductor 241 can be more easily and firmly connected to the metal foil 243. However, it is more difficult to solder conductor 241 to the tabs on cell 1 after the top cover 2 is placed on top of cell 1. Therefore, when the metal foil 243 is soldered to conductor 241 first, and then the top cover 2 is placed on cell 1 for soldering, the metal foil 243 and the tabs of cell 1 have a larger contact area, which makes it easier to fix and connect them. The metal foil 243 can even be directly attached to the first positive sub-tab 14, the second positive sub-tab 15, the first negative sub-tab 16, or the second negative sub-tab 17.

[0045] The foils on the first positive electrode sub-post 24 and the second positive electrode sub-post 25 are aluminum foils, while the foils on the first negative electrode sub-post 26 and the second negative electrode sub-post 27 are copper foils. In the battery cell 1, to reduce the internal resistance of the battery cell 1, the current collector of the positive electrode of the battery cell 1 is usually made of aluminum foil, while the current collector of the negative electrode of the battery cell 1 is made of copper foil. In the battery cell 1, the resistance of the negative electrode has a greater impact on the internal resistance of the battery cell 1, so copper foil with better conductivity is used for the negative electrode. In order to improve the welding effect, that is, to have a better welding effect between copper foils and between aluminum foils, the foils on the first negative electrode sub-post 26 and the second negative electrode sub-post 27 are made of copper foils, and the foils on the first positive electrode sub-post 24 and the second positive electrode sub-post 25 are made of aluminum foils.

[0046] The single battery also includes a casing 3, a cover 21 fixedly connected to the casing 3 and constraining a sealed cavity, and a battery cell 1 disposed within the sealed cavity. During the battery manufacturing process, the battery cell 1 is first installed inside the casing 3, and then the various terminals on the top cover 2 are welded to the various tabs on the battery cell 1. After the welding is completed, the cover 21 of the top cover 2 is then sealed and welded to the casing 3 to provide a sealed environment for the battery cell 1.

[0047] A detection hole 213 is also provided through the cover 21. A detection device 28 is placed on the end of the detection device 28 away from the battery cell 1 and is used to measure the air pressure and temperature inside the sealed cavity. A sealing ring 4 is provided between the cover 21 and the detection device 28, and the end of the detection hole 213 away from the battery cell 1 is located inside the sealing ring 4. By providing a detection hole 213 on the cover 21, the sensor for measuring air pressure and temperature in the detection device 28 is placed inside the detection hole 213 to measure the air pressure and temperature of the battery. In related technologies, placing the sensor for measuring air pressure and temperature inside the housing 3 not only occupies a large space, but also requires a wire hole to transmit the information measured by the sensor, which not only occupies more space and reduces the energy density of the battery, but also requires a lead wire, making the structure of the top cover 2 more complex. In order to avoid affecting the sealing performance of the battery by opening the detection hole 213, a sealing ring 4 is provided on the detection hole 213, and the sealing ring 4 is pressed tightly by the detection device 28 to ensure the sealing performance of the battery. Specifically, the detection device 28 includes a circuit board 281 and a chip 282. The circuit board 281 covers the cover 21, and the chip 282 is located on the side of the circuit board 281 away from the cover 21. The circuit board 281 presses against the sealing ring 4 to ensure a sealing effect at the detection hole 213.

[0048] The battery pack according to a second aspect embodiment of this application includes individual cells as described in any of the above embodiments, wherein the individual cells are electrically connected to each other. Specifically, adjacent positive or negative terminals on the individual cells are connected via conductive connectors. However, some testing devices on the battery pack draw power from the connectors that connect the individual cells via wires, making the overall structure of the battery pack more complex, especially with longer wires, which further complicates assembly. By using the individual cells as described in any embodiment of this application, the testing devices can draw power directly from the cells, resulting in a simpler battery pack structure and higher energy density.

[0049] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A single cell, including: case; A top cover, the top cover comprising a cover body, a positive terminal and a negative terminal, the positive terminal and the negative terminal being connected to the cover body, the cover body being connected to the housing and defining a cavity; A battery cell is disposed in the cavity. The battery cell includes a positive main electrode, a negative main electrode, a positive secondary electrode, and a negative secondary electrode. The positive main electrode is electrically connected to the positive terminal, and the negative main electrode is electrically connected to the negative terminal. A detection device is connected to the cover, and both the positive and negative electrodes are electrically connected to the detection device.

2. The single-cell battery according to claim 1, wherein, The top cover also includes a positive terminal and a negative terminal, both of which penetrate the cover body. The end of the positive terminal away from the battery cell is connected to the detection device, and the end of the positive terminal close to the battery cell is connected to the positive and negative tabs. The end of the negative terminal away from the battery cell is connected to the detection device, and the end of the negative terminal close to the battery cell is connected to the negative and negative tabs.

3. The single-cell battery according to claim 2, wherein, The top cover includes two positive terminals and two negative terminals, and the battery cell includes two positive and two negative tabs. The two positive terminals and the two positive and two negative tabs are connected in a one-to-one correspondence, and the two negative terminals and the two negative tabs are connected in a one-to-one correspondence.

4. The single-cell battery according to claim 2, wherein, The detection device covers the side of the cover opposite to the battery cell, and the detection device covers one end of the positive terminal and the negative terminal.

5. The single-cell battery according to claim 2, wherein, The positive and negative terminals are spaced apart along the length of the current collector on the battery cell.

6. The single-cell battery according to claim 2, wherein, The cover has a groove on the side facing away from the battery cell, and the detection device is disposed in the groove.

7. The single-cell battery according to claim 3, wherein, The bottom of the groove has a through hole, and the two positive terminals and the two negative terminals are respectively arranged in different through holes.

8. The single-cell battery according to claim 2, wherein, Both the positive terminal and the negative terminal include a conductor and an insulating sleeve. The insulating sleeve is fitted around the outer periphery of the conductor to insulate the conductor from the cover. One end of the conductor exposed in the groove is connected to the detection device, and the end of the conductor near the battery cell is electrically connected to the battery cell.

9. The single-cell battery according to claim 8, wherein, A metal foil is also provided at one end of the conductor near the battery cell. The metal foil on the positive terminal is connected to the positive and negative terminals, and the metal foil on the negative terminal is connected to the negative and negative terminals.

10. The single-cell battery according to claim 9, wherein, The foil on the positive electrode post is an aluminum foil, and the foil on the negative electrode post is a copper foil.

11. The single-cell battery according to claim 1, wherein, The cover is also provided with a detection hole that penetrates the cover. The detection device includes a pressure sensor and a temperature sensor. The pressure sensor and the temperature sensor are disposed in the detection hole. The pressure sensor is used to measure the pressure inside the cavity, and the temperature sensor is used to measure the temperature inside the cavity. The detection device covers the end of the detection hole away from the battery cell. A sealing ring is provided on the detection hole to seal between the detection hole and the cover.

12. The single-cell battery according to claim 1, wherein, The detection device includes a circuit board and a chip. The circuit board covers the cover, and the chip is disposed on the side of the circuit board away from the battery cell.

13. The single-cell battery according to claim 1, wherein, The positive and negative terminals are exposed on the side of the cover opposite to the cell, forming the positive and negative electrodes of the single cell.

14. The single-cell battery according to claim 1, wherein, The detection device is provided with pins, and the positions of the positive and negative electrodes on the battery cell correspond to the positions of the pins.

15. A battery pack comprising the single cell of any one of claims 1-14.

Images