A multi-pole core battery

Abstract

This utility model discloses a multi-core battery, comprising: a casing with an opening; a cover plate disposed at one end of the opening, sealing the opening, the cover plate having a positive terminal, a negative terminal, and a sensor interface; a core assembly disposed within the casing, the core assembly having a positive tab and a negative tab connected to the positive terminal and the negative terminal respectively, the core assembly being composed of multiple connected cores; a temperature and pressure measuring device disposed between the cores; and a signal transmission module connected to the temperature and pressure measuring device through the sensor interface. The structure is simple and can accurately monitor the expansion force and temperature of the cores in real time.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically to a multi-cell battery. Background Technology

[0002] Currently, existing battery technologies all use individual battery cells as the basic unit, combining them into modules or battery packs to achieve cell integration. Existing batteries require a series of components such as connectors, end plates, and side plates to ensure cell integration; the large number of parts and complex structure lead to high battery costs.

[0003] Furthermore, the temperature and expansion force exhibited by a battery cell are initially generated by the internal electrode core and then conducted or transferred to the cell casing. However, existing batteries, after cell assembly, can only monitor the temperature of the cell casing, failing to accurately detect the internal temperature of the cell. During use, if the internal temperature of the cell cannot be monitored in a timely manner, it can easily exceed the cell's permissible operating temperature or even lead to thermal runaway. Moreover, the inability to monitor the internal expansion force of the cell in real time introduces errors and lag. When the expansion force is excessive, the cell may swell or even short-circuit and explode, compromising cell safety and effective battery management.

[0004] Therefore, how to provide a battery with a simple structure that can accurately monitor the expansion force and temperature of the electrode core in real time is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides a multi-core battery with a simple structure that can monitor the expansion force and temperature of the core in real time and accurately.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A multi-cell battery, comprising:

[0008] The casing has an opening;

[0009] A cover plate is disposed at one end of the opening to enclose the opening. The cover plate is provided with a positive terminal, a negative terminal, and a sensor interface.

[0010] A core assembly is disposed within the housing. The core assembly has a positive tab and a negative tab that are respectively connected to the positive terminal and the negative terminal. The core assembly is composed of multiple battery cores connected together.

[0011] A temperature and pressure measuring device is installed between the electrode cores of the battery cell;

[0012] The signal transmission module is connected to the temperature and pressure measuring device through the sensor interface.

[0013] Preferably, the cover plate is also provided with a cell explosion-proof valve.

[0014] Preferably, the battery cell has a positive electrode and a negative electrode.

[0015] Preferably, the individual battery cells in the electrode group are connected in series sequentially;

[0016] The positive electrode plate of the first battery cell serves as the positive electrode tab;

[0017] The negative electrode of the first battery cell is connected to the positive electrode of the second battery cell.

[0018] The negative electrode of the second battery cell is connected to the positive electrode of the third battery cell, and so on, with the negative electrode of the last battery cell serving as the negative electrode tab.

[0019] Preferably, the multiple battery cells in the electrode group are connected in parallel in sequence to form a battery cell unit;

[0020] The positive electrode plates of multiple battery cell cores are interconnected to serve as the positive electrode of the battery cell unit;

[0021] The negative electrode plates of multiple battery cell cores are interconnected to serve as the negative electrode of the battery cell unit;

[0022] The positive electrode of the battery cell unit serves as the positive electrode tab;

[0023] The negative terminal of the battery cell unit serves as the negative electrode tab.

[0024] Preferably, the electrode core assembly is composed of multiple battery cell units connected in series.

[0025] The positive terminal of the first battery cell unit serves as the positive electrode tab;

[0026] The negative terminal of the last battery cell unit serves as the negative electrode tab.

[0027] Preferably, the temperature and pressure measuring device is provided between the electrode core assembly and the housing.

[0028] Preferably, the temperature and pressure measuring device employs a thin-film sensor, comprising: a sensing unit, internal circuitry, and an encapsulation film;

[0029] The internal circuitry is connected to the sensing unit;

[0030] The encapsulation film encapsulates the internal circuitry and the sensing unit.

[0031] Preferably, the sensing unit includes a temperature sensing unit and a pressure sensing unit.

[0032] Preferably, the encapsulation film is an insulating film.

[0033] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a multi-core battery. By connecting multiple cores in series or parallel, batteries with different voltages and capacities can be formed, avoiding the repeated development of cells with different capacities and reducing R&D waste. A cell composed of multiple cores is a module, reducing the number of components that make up the core module, simplifying the structure, simplifying the battery pack integration scheme, and thus reducing costs. Compared with large cells formed by a single large core with high capacity, which have risks such as large volume, internal heat dissipation, and uneven stress, this utility model's multi-core battery can effectively avoid the risks of internal heat dissipation and uneven stress. Through thin-film sensors, the expansion force and temperature data of the cores can be monitored in real time and accurately. Combined with the internal short circuit status of the thin-film sensors, it can monitor whether lithium plating occurs in the cell, which helps to comprehensively detect and manage the health status of the battery. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a multi-cell battery structure provided by this utility model.

[0036] Figure 2 This utility model provides a schematic diagram of a multi-core battery structure with the cores connected in series.

[0037] Figure 3 This is a schematic diagram of the series connection of the battery cell electrodes provided by this utility model.

[0038] Figure 4 A schematic diagram of the temperature and pressure measuring device 7 provided by this utility model.

[0039] Figure 5 A schematic diagram of another multi-core battery structure with parallel cell electrodes provided by this utility model.

[0040] Figure 6 A schematic diagram of the parallel connection of the battery cell electrodes provided by this utility model.

[0041] 1—Housing, 2—Cover plate, 3—Positive terminal, 4—Negative terminal, 5—Sensor interface, 6—Electrode core assembly, 61—Positive tab, 62—Negative tab, 63—Cell electrode core, 64—Cell unit, 7—Temperature and pressure measuring device, 71—Sensing unit, 72—Internal circuit, 73—Encapsulation film, 8—Signal transmission module, 9—Cell explosion-proof valve. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Example 1

[0044] like Figure 1 As shown, this utility model embodiment discloses a multi-cell battery, comprising:

[0045] Housing 1, having an opening;

[0046] Cover plate 2 is set at one end of the opening to seal the opening. Cover plate 2 is provided with positive terminal 3, negative terminal 4 and sensor interface 5.

[0047] The electrode assembly 6 is disposed inside the housing 1. The electrode assembly 6 has a positive electrode tab 61 and a negative electrode tab 62 that are respectively connected to the positive electrode post 3 and the negative electrode post 4. The electrode assembly 6 is composed of multiple battery cell electrode 63 connected together.

[0048] Temperature and pressure measuring device 7 is installed between the battery cell electrodes 63;

[0049] The signal transmission module 8 is connected to the temperature and pressure measuring device 7 through the sensor interface 5.

[0050] Example 2

[0051] like Figures 2-3 As shown in the figure, this utility model embodiment discloses a multi-cell battery with cells connected in series, comprising:

[0052] The housing 1 has an opening.

[0053] Cover plate 2 is located at one end of the opening to seal the opening. Cover plate 2 is provided with positive terminal 3, negative terminal 4 and sensor interface 5.

[0054] Preferably, the cover plate 2 is also equipped with a cell explosion-proof valve 9.

[0055] The electrode core group 6 is disposed inside the housing 1. The electrode core group 6 has a positive electrode tab 61 and a negative electrode tab 62 that are respectively connected to the positive electrode post 3 and the negative electrode post 4. The electrode core group 6 is composed of multiple battery cell electrode cores 63 connected together.

[0056] Preferably, the battery cell core 63 has a positive electrode and a negative electrode.

[0057] Preferably, the individual battery cells 63 in the electrode group 6 are connected in series.

[0058] The positive electrode plate of the first cell core 63 serves as the positive electrode tab 61;

[0059] The negative electrode of the first cell core 63 is connected to the positive electrode of the second cell core 63;

[0060] The negative electrode of the second cell core 63 is connected to the positive electrode of the third cell core 63, and so on, with the negative electrode of the last cell core 63 serving as the negative electrode tab 62.

[0061] Temperature and pressure measuring device 7 is installed between the battery cell electrodes 63.

[0062] Preferably, in this embodiment, a temperature and pressure measuring device 7 is provided between the two battery cell electrodes 63 in the middle position, or a temperature and pressure measuring device 7 is provided between any two battery cell electrodes 63. The number of temperature and pressure measuring devices 7 is not limited in this utility model and can be set according to actual needs.

[0063] Preferably, a temperature and pressure measuring device 7 is provided between the core assembly 6 and the housing 1.

[0064] like Figure 4 As shown, the temperature and pressure measuring device 7 uses a thin-film sensor, including: a sensing unit 71, an internal circuit 72, and an encapsulation film 73;

[0065] Internal circuit 72 is connected to sensing unit 71;

[0066] The encapsulation film 73 encapsulates the internal circuitry 72 and the sensing unit 71.

[0067] Preferably, the sensing unit 71 includes a temperature sensing unit and a pressure sensing unit.

[0068] Preferably, in this embodiment, the temperature sensing unit uses a resistance R of 10KΩ @ 25℃, and the B constant is generally 3470K. The higher the B constant, the more sensitive and accurate the temperature sensing unit.

[0069] Preferably, in this embodiment, the temperature sensing unit uses a thermistor or other more precise temperature sensing element.

[0070] Preferably, in this embodiment, the pressure sensing unit uses a pressure sensing element with a pressure range of 0 to 10 bar and an accuracy of ±1%FS.

[0071] Preferably, in this embodiment, the pressure sensing unit uses a pressure-sensitive resistor or other more precise pressure sensing element.

[0072] Preferably, the encapsulation film 73 encapsulates the internal circuitry 72 and the sensing unit 71 through an encapsulation process, ensuring the insulation safety between the internal circuitry 72 of the thin-film sensor and the battery cell core 63.

[0073] Preferably, the encapsulation film 73 is an insulating film, and in this embodiment, a PET film or a PI film is used.

[0074] The signal transmission module 8 is connected to the temperature and pressure measuring device 7 through the sensor interface 5.

[0075] Preferably, the temperature and pressure data measured by the temperature and pressure measuring device 7 are acquired by the signal transmission module 8 and transmitted to other device terminals.

[0076] Example 3

[0077] This utility model embodiment discloses a multi-core battery with parallel cell electrode connections. The other structures of the battery are the same as those in embodiment 2 above, except that the connection relationship of the cell electrodes within the electrode group 6 is different:

[0078] Preferably, multiple battery cell electrodes 63 in electrode group 6 are connected in parallel in sequence to form battery cell unit 64;

[0079] The positive electrode plates of multiple battery cell cores 63 are interconnected to serve as the positive electrode of the battery cell unit 64;

[0080] The negative electrode plates of multiple battery cell cores 63 are interconnected to serve as the negative electrode of battery cell unit 64;

[0081] The positive terminal of the battery cell 64 serves as the positive electrode tab 61;

[0082] The negative terminal of the battery cell 64 serves as the negative electrode ear 62.

[0083] In this embodiment, multiple battery cell poles 63 are connected in parallel to form a battery cell unit 64, and one battery cell unit 64 is used as a pole group 6.

[0084] Example 4

[0085] like Figures 5-6 As shown, taking two battery cells 63 connected in parallel to form a battery cell unit 64 as an example, this utility model embodiment discloses another multi-cell battery with battery cells connected in parallel. The other structures of the battery are the same as those in embodiment 2 above, except that the connection relationship of the battery cells inside the core group 6 is different:

[0086] Preferably, in this embodiment, multiple battery cell electrodes 63 in the electrode group 6 are connected in parallel in sequence to form a battery cell unit 64;

[0087] The positive electrode plates of multiple battery cell cores 63 are connected to each other by welding to serve as the positive electrode of the battery cell unit 64;

[0088] The negative electrode plates of multiple battery cell cores 63 are connected to each other by welding to serve as the negative electrode of battery cell unit 64.

[0089] Preferably, the electrode core group 6 is composed of multiple battery cell units 64 connected in series;

[0090] The positive terminal of the first battery cell 64 serves as the positive electrode tab 61;

[0091] The negative terminal of the last cell unit 64 serves as the negative electrode ear 62.

[0092] Preferably, in this embodiment, multiple battery cell poles 63 are connected in parallel to form a battery cell unit 64, and then multiple battery cell units 64 are connected in series to form a pole group 6.

[0093] Preferably, the connection between each cell electrode 63 is a welded connection.

[0094] Based on the above embodiments, this utility model forms batteries with different voltages and capacities by connecting multiple battery cells in series or in parallel, avoiding the repeated research and development of battery cells with different capacities and reducing research and development waste.

[0095] Example 5

[0096] The working principle of this utility model:

[0097] Temperature and pressure measuring devices 7, which are installed between the cell electrodes 63 and / or between the cell electrodes 63 and the housing 1, collect temperature and pressure data at different locations of the cell electrodes 63 in real time. When the cell electrodes 63 expand during charging and discharging, they will squeeze the temperature and pressure measuring devices 7. The temperature and pressure measuring devices 7 collect pressure data and output it as an electrical signal to the battery management system or other device terminals through the sensor interface 5 and the signal transmission module 8. At the same time, the temperature of the cell electrodes collected in real time is output as an electrical signal to the battery management system or other device terminals through the sensor interface 5 and the signal transmission module 8.

[0098] The collected temperature and pressure data are compared with the corresponding normal ranges to determine whether the battery is malfunctioning. At the same time, the lithium plating of the cell electrode 63 is judged based on whether the temperature and pressure measuring device 7 can collect data normally. Since the temperature and pressure measuring device 7 has a dense circuit inside, when lithium plating occurs between the cell electrode 63, it punctures the encapsulation film 73 of the temperature and pressure measuring device 7, causing a short circuit in the internal circuit 72 and generating a current signal. At this time, it is determined that lithium plating has occurred in the cell electrode 63 inside the electrode group 6.

[0099] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a multi-core battery. By connecting multiple cores in series or parallel, batteries with different voltages and capacities can be formed, avoiding the repeated development of cells with different capacities and reducing R&D waste. A cell composed of multiple cores is a module, reducing the number of components that make up the core module, simplifying the structure, simplifying the battery pack integration scheme, and thus reducing costs. Compared with large cells formed by a single large core with high capacity, which have risks such as large volume, internal heat dissipation, and uneven stress, this utility model's multi-core battery can effectively avoid the risks of internal heat dissipation and uneven stress. Through thin-film sensors, the expansion force and temperature data of the cores can be monitored in real time and accurately. Combined with the internal short circuit status of the thin-film sensors, it can monitor whether lithium plating occurs in the cell, which helps to comprehensively detect and manage the health status of the battery.

[0100] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0101] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-cell battery, characterized in that, include: The casing has an opening; A cover plate is disposed at one end of the opening to enclose the opening. The cover plate is provided with a positive terminal, a negative terminal, and a sensor interface. A core assembly is disposed within the housing. The core assembly has a positive tab and a negative tab that are respectively connected to the positive terminal and the negative terminal. The core assembly is composed of multiple battery cores connected together. A temperature and pressure measuring device is installed between the electrode cores of the battery cell; The signal transmission module is connected to the temperature and pressure measuring device through the sensor interface.

2. A multi-cell battery according to claim 1, characterized in that, The cover plate is also equipped with a cell explosion-proof valve.

3. A multi-cell battery according to claim 1, characterized in that, The battery cell has a positive electrode and a negative electrode.

4. A multi-cell battery according to claim 3, characterized in that, Each of the battery cells in the electrode group is connected in series in sequence. The positive electrode plate of the first battery cell serves as the positive electrode tab; The negative electrode of the first battery cell is connected to the positive electrode of the second battery cell. The negative electrode of the second battery cell is connected to the positive electrode of the third battery cell, and so on, with the negative electrode of the last battery cell serving as the negative electrode tab.

5. A multi-cell battery according to claim 3, characterized in that, The multiple battery cell electrodes in the electrode group are connected in parallel in sequence to form a battery cell unit; The positive electrode plates of multiple battery cell cores are interconnected to serve as the positive electrode of the battery cell unit; The negative electrode plates of multiple battery cell cores are interconnected to serve as the negative electrode of the battery cell unit; The positive electrode of the battery cell unit serves as the positive electrode tab; The negative terminal of the battery cell unit serves as the negative electrode tab.

6. A multi-cell battery according to claim 5, characterized in that, The electrode core assembly is composed of multiple battery cell units connected in series. The positive terminal of the first battery cell unit serves as the positive electrode tab; The negative terminal of the last battery cell unit serves as the negative electrode tab.

7. A multi-cell battery according to claim 1, characterized in that, The temperature and pressure measuring device is provided between the electrode core assembly and the housing.

8. A multi-cell battery according to claim 1 or 7, characterized in that, The temperature and pressure measuring device uses a thin-film sensor, including: a sensing unit, internal circuitry, and an encapsulation film; The internal circuitry is connected to the sensing unit; The encapsulation film encapsulates the internal circuitry and the sensing unit.

9. A multi-cell battery according to claim 8, characterized in that, The sensing unit includes a temperature sensing unit and a pressure sensing unit.

10. A multi-cell battery according to claim 8, characterized in that, The encapsulation film is an insulating film.

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