Battery structure and system

Abstract

The invention provides a battery structure and system, the battery structure comprises a shell, the interior of the shell is provided with an inner cavity; a plurality of battery cells are arranged in an inner cavity formed in the shell; each pressure sensor is located between every two adjacent battery cells, and the pressure sensors are used for monitoring information in the battery structure; and the chip is arranged in the inner cavity of the shell, and the chip is electrically connected with the pressure sensor. According to the invention, the pressure sensor is assembled between the battery cells and is connected with the PLC chip arranged between the battery cells and the cover plate, and pressure signal transmission is carried out through positive and negative electrodes of the battery by adopting a PLC technology, so that monitoring of internal information of the battery and temperature management are realized; the design of the thin film pressure sensor achieves the purposes that the thickness of the sensor is small, the battery can be implanted in a lossless mode and the like, and the battery can be conveniently implanted and packaged in the battery production process.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and particularly relates to a battery structure and system. Background Art

[0002] With the global emphasis on clean energy and the adjustment of the social energy structure, lithium-ion batteries are widely used in energy storage, electric vehicles, consumer electronics, and transportation fields due to their high energy density, high Coulomb efficiency, long cycle life, and other advantages. Currently, lithium batteries face problems such as inaccurate battery monitoring, inaccurate detection of life and battery capacity, and rapid attenuation in the on-vehicle and energy storage fields.

[0003] At present, due to their complex structure, implantable sensors have a greater impact on battery performance, and problems such as the need to lead the power line and signal line out of the battery from the inside, resulting in a decrease in battery sealing performance. During the charging and discharging process of the battery, the volume of the battery electrode plate will change, causing periodic fluctuations in the stacking pressure of the electrode plates, and the aging and abnormal mechanical impact of the battery will also have a significant impact on the stress distribution inside the battery. Therefore, accurately obtaining internal battery information in real time for monitoring and management without affecting battery performance is the current focus of the development of power batteries. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problems such as the difficulty in obtaining internal information of traditional lithium-ion batteries, the complex external wiring after sensor implantation, and the obvious impact of improper implantation of components on battery performance.

[0005] The invention provides the following technical solutions: A battery structure, comprising: A housing, the interior of the housing has an inner cavity; Battery cores, a plurality of battery cores are arranged in the inner cavity formed inside the housing; A pressure sensor, the pressure sensor is located between two adjacent battery cores, and the pressure sensor is used for monitoring the information inside the battery structure; A chip, the chip is arranged in the inner cavity of the housing, and the chip is electrically connected to the pressure sensor; the chip is used to obtain the information monitored by the pressure sensor and transmit the information to the outside; Terminal posts, two terminal posts are arranged on the housing, the two terminal posts are respectively electrically connected to the two electrode ends of the battery core, and the chip is also electrically connected to the two terminal posts, and the information obtained by the chip from the pressure sensor is transmitted to the outside through the terminal posts.

[0006] Further, the housing includes an outer shell having a bottom wall and side walls, and a top cover arranged at the opening of the outer shell, and the top cover and the outer shell enclose to form the inner cavity.

[0007] Further, the battery core is made by using a manufacturing process of winding core assembly.

[0008] Further, the pressure sensor is divided into three layers in total. The internal main structure is composed of a piezoelectric sensor array, and the external part is composed of two layers of polyimide films.

[0009] Further, the chip is an LPC chip with an operating voltage between 3.0V and 5.0V. The VCC pin and GND pin of the LPC chip are respectively connected to the two pole columns.

[0010] Further, one end of the pole column extends into the interior of the housing and is electrically connected to the electrode end of the battery core, and the other end is exposed outside the housing.

[0011] Further, the overall structure of the battery is square.

[0012] Further, the LPC chip includes a signal module. The signal module is composed of a frame header and a frame response. The frame header is used to achieve signal synchronization and signal source identification. Data transmission and verification are carried out in the frame response. After the chip obtains pressure information from the pressure sensor, it can add a preset digital sequence before and after the data information segment in the frame response, so as to achieve the encryption function during the transmission of the pressure signal, and then use the PLC technology to directly output the pressure information through the pole column.

[0013] A battery system includes a plurality of the above-mentioned battery structures, a demodulator, and a host computer. The plurality of battery structures are connected in series. The signals detected by the pressure sensor are transmitted through the pole column to the demodulator by the chip for demodulation, and then the demodulated data is transmitted to the host computer to obtain the real-time pressure information inside the battery structure.

[0014] The beneficial effects of the invention are as follows: By assembling the pressure sensor between the battery cores and connecting it to the PLC chip placed between the battery core and the cover plate, and using the PLC technology to transmit the pressure signal through the positive and negative electrodes of the battery, the monitoring of the internal information of the battery and the temperature management are realized. The design of the thin-film pressure sensor achieves the purposes of a thinner sensor thickness and non-destructive implantation into the battery, etc., and can be conveniently implanted and encapsulated during the battery production process.

[0015] By directly connecting the PLC chip to the two pole columns to obtain electric energy, self-power supply is realized, and the costs of wire harnesses and connectors are saved, making the internal structure simple and clear, facilitating battery sealing, and using the PLC technology for signal transmission. After obtaining the pressure signal, the chip can add a preset digital sequence before and after the data information segment in the frame response to achieve the signal encryption function and ensure the stability and security of signal transmission.

[0016] By making the pressure sensor insulative and corrosion-resistant, when it is implanted into the battery, it can ensure the working stability without causing short circuit inside the battery. At the same time, the PVDF thin film pressure sensor has the advantages of simple structure, high sensitivity, wide bandwidth and good dynamic characteristics, and is very suitable for the pressure monitoring of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the structural diagram of the battery of the present invention; Figure 2 is the structural diagram of the pressure sensor of the present invention; Figure 3 is the schematic diagram of the signal encryption principle of the present invention; Figure 4 is the schematic diagram of the actual application of the battery system of the present invention; Figure 5 is the schematic diagram of the self-powered encrypted coding battery system of the present invention.

[0018] The reference signs in the drawings are: 1 - housing, 2 - inner cavity, 3 - top cover, 4 - winding core, 5 - pressure sensor, 6 - pole column, 7 - chip, 8 - lead wire, 9 - polyimide film, 10 - piezoelectric sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0020] It should be noted that when an element is referred to as being "fixedly provided on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] A battery structure, the overall shape of the battery structure is square, including: a housing 1, a battery core, a pressure sensor 5, a chip 7 and a pole column 6; As shown Figure 1 in Figure 1 , the housing 1 specifically includes a casing having a bottom wall and side walls, and a top cover 3 provided at an opening of the casing. The top cover 3 and the casing enclose to form the inner cavity 2; As shown Figure 1 in Figure 1 , a plurality of battery cores are provided in the inner cavity 2 formed inside the housing 1. In this embodiment, two battery cores are provided. The battery cores are made by using the manufacturing process of winding the core 4. By the winding method, the positive electrode plate, the negative electrode plate, and the separator are made into the winding core 4 in a certain order.

[0023] As shown Figure 1 and Figure 2 in Figure 1 and Figure 2 , a pressure sensor 5 is provided between two adjacent battery cores. The pressure sensor 5 is used to monitor the information inside the battery structure. The pressure sensor 5 is a PVDF thin film type pressure sensor 5. It is encapsulated by using a PDMS thin film, and the entire pressure sensor 5 is encapsulated by using polyimide. The circuit leads 8 of the pressure sensor 5 are respectively on both sides of the interface circuit. This design ensures the adaptability and sealing performance of the pressure sensor 5 to the square shell battery, avoids the electrode damage and the corrosion problem of the pressure sensor 5 caused by the implantation of the pressure sensor 5, and effectively realizes the pressure monitoring of the battery. Specifically, the pressure sensor 5 is assembled between two winding cores 4 and is encapsulated by polyimide, effectively avoiding the complex process problem caused by the implantation of the sensor in the actual battery production process. The thin film pressure sensor 5 is divided into three layers in total. The internal main structure is composed of a piezoelectric sensor 10 array, and the external is composed of two layers of polyimide films 9. The pressure sensor 5 is placed between two winding cores 4 of the square shell battery. The lead 8 of the pressure sensor 5 and the PLC chip 7 are assembled together between the battery winding core 4 and the end cover. The pressure sensor 5 has conductive insulation and can avoid the corrosion of the electrolyte to the components, ensuring that the battery does not have an internal short circuit during operation. At the same time, since the pressure sensor 5 is arranged in the middle of two battery cores, its implantation between the battery cores does not affect the normal operation of the lithium battery electrode plate and will not cause problems such as the deformation of the electrode plate. And the pressure sensing monitoring adopts a multiplexed column common line design, effectively simplifying the circuit design complexity and the signal processing amount, and having the advantages of high reliability, strong accuracy, compact structure, high integration, and low cost.

[0024] The manufacturing process of the pressure sensor 5 can be referred to as follows: Dissolve PVDF resin in a dimethylacetamide solution at a ratio of 20%, pour it on a smooth and flat aluminum plate, place it in an incubator at 200 - 300 °C for drying, take it out and cool it in water to form a PVDF film with a thickness of 50 μm - 80 μm. Immediately, perform high-voltage polarization treatment on the PVDF film to make the PVDF film obtain higher piezoelectric sensitivity. Use the method of magnetron sputtering to prepare electrodes on the PVDF film. For the electrode array, each column of electrodes shares a wire to connect to the external interface circuit to improve the signal detection speed. Then put the processed PVDF film into a vacuum drying oven and dry and cure it at a set temperature. Finally, coat the outside of the thin film sensor with a polyimide film 9 to prevent electrolyte corrosion.

[0025] As Figure 1 shown, there is a chip 7, the chip 7 is arranged in the inner cavity 2 of the housing 1, and the chip 7 is electrically connected to the pressure sensor 5, which can supply electrical energy to the pressure sensor 5 and acquire pressure signals; the chip 7 is used to acquire the information monitored by the pressure sensor 5 and transmit the information to the outside; wherein: the chip 7 is an LPC chip 7, and its operating voltage is between 3.0V - 5.0V. The VCC pin and GND pin of the LPC chip 7 are respectively connected to the two pole columns 6, so that the LPC chip 7 directly obtains electrical energy from the battery core to supply power to the chip 7, and transmits the acquired information to the outside through the pole column 6; the LPC chip 7 is arranged between two battery cores and the cover plate. Further, as Figure 3 shown, the LPC chip 7 includes a signal module, the signal module is composed of a frame header and a frame response. The frame header is used to achieve signal synchronization and signal source identification, and data transmission and verification are performed in the frame response. After the chip 7 obtains pressure information from the pressure sensor 5, it can add a preset digital sequence before and after the data information segment in the frame response to achieve the encryption function during the transmission of pressure signals, and then directly output the pressure information through the pole column 6 using PLC technology.

[0026] As Figure 1 shown, there are pole columns 6. Two pole columns 6 are arranged on the housing 1, and the two pole columns 6 are respectively electrically connected to the two electrode ends of the battery core, and the chip 7 is also electrically connected to the two pole columns 6. The information monitored by the pressure sensor 5 acquired by the chip 7 is transmitted to the outside through the pole column 6; the two pole columns 6 are respectively connected to the positive electrode and the negative electrode end of the battery core; further, one end of the pole column 6 extends into the housing 1 and is electrically connected to the electrode end of the battery core, and the other end is exposed outside the housing 1.

[0027] The working process of the present invention is as follows: The pressure sensor 5 acquires the pressure change data between the two cores 4 and transmits it to the chip 7. After the chip 7 acquires and processes the pressure change data, it transmits the carrier signal to the external system through the terminal post 6. Thus, no additional sampling and communication wire harnesses are required, and the self-power supply function is achieved. After acquiring the pressure signal, the chip 7 can add a preset digital sequence before and after the data information segment in the frame response to achieve the signal encryption function, and at the same time, the stable transmission of data can be realized. The internal pressure change of the battery can be acquired in real time to realize the all-weather operation of monitoring the battery.

[0028] In summary, by assembling the pressure sensor 5 between the battery cores and connecting it to the PLC chip 7 placed between the battery core and the cover plate, and using the PLC technology to transmit the pressure signal through the positive and negative electrodes of the battery, the monitoring of the internal information of the battery and the temperature management are realized. The design of the thin-film pressure sensor 5 achieves the purposes of a thinner sensor thickness and non-destructive implantation into the battery, and can be conveniently implanted and encapsulated during the battery production process.

[0029] By directly connecting the PLC chip 7 to the two terminal posts 6 to obtain electric energy, the self-power supply is realized, and the cost of wire harnesses and connectors is saved, making the internal structure simple and clear, which is beneficial to the battery sealing. Moreover, using the PLC technology for signal transmission, after acquiring the pressure signal, the chip 7 can add a preset digital sequence before and after the data information segment in the frame response to achieve the signal encryption function, and ensure the stability and security of signal transmission.

[0030] By making the pressure sensor 5 have insulation and corrosion resistance, when it is implanted into the battery, it can ensure the working stability without causing a short circuit inside the battery. At the same time, the PVDF thin-film pressure sensor 5 has the advantages of simple structure, high sensitivity, wide bandwidth, and good dynamic characteristics, and is very suitable for the pressure monitoring of square shell batteries.

[0031] Furthermore, the pressure sensor 5 in the present invention is designed with the advantages of low cost, clear structure, mature preparation process, good encapsulation performance, and miniaturization. It has the advantages of simplicity and high efficiency in aspects such as signal acquisition, signal transmission, and sensor fixation, and is very suitable for practical applications.

[0032] The present invention also provides a second embodiment, which provides a battery system, as Figure 4 and Figure 5 shown. The battery system includes a plurality of the battery structures in the first embodiment, a demodulator, and a host computer. The plurality of battery structures are connected in series. The signal detected by the pressure sensor 5 is transmitted to the demodulator through the terminal post 6 by the chip 7 for demodulation, and then the demodulated data is transmitted to the host computer to realize the acquisition of the real-time pressure information inside the battery structure.

[0033] Specifically, the power line carrier signals of each single battery structure can be input into the demodulator in parallel for signal demodulation, so as to realize the real-time monitoring of the internal pressure of the single battery structure in the battery system. Therefore, by adopting the battery structure of the present invention in the battery system, it is possible to monitor the charging and discharging of single cells in the battery system, evaluate the attenuation of battery capacity, monitor the aging state, abnormal deformation of the battery, thermal runaway and mechanical shock, which has great practical value for actual vehicle-mounted applications and energy storage equipment.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The above-described embodiments merely represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A battery structure, characterized in that, Comprising: A housing having an inner cavity inside; Battery cores, with a plurality of battery cores arranged inside the inner cavity formed within the housing; A pressure sensor located between two adjacent battery cores, and the pressure sensor is used for monitoring information inside the battery structure; A chip disposed inside the inner cavity of the housing, and the chip is electrically connected to the pressure sensor; the chip is used for acquiring the information monitored by the pressure sensor and transmitting the information to the outside; Terminal posts, with two terminal posts provided on the housing, the two terminal posts being electrically connected to two electrode ends of the battery cores respectively, and the chip is also electrically connected to the two terminal posts, and the information acquired by the chip from the pressure sensor is transmitted to the outside through the terminal posts.

2. The battery structure according to claim 1, wherein The housing includes an outer shell having a bottom wall and side walls, and a top cover provided at the opening of the outer shell, and the top cover and the outer shell enclose to form the inner cavity.

3. The battery structure according to claim 1, characterized in that, The battery cores are made by using a manufacturing process of winding core assembly.

4. The battery structure according to claim 1, wherein, The pressure sensor is divided into three layers in total, with the internal main structure composed of a piezoelectric sensor array and the outside composed of two layers of polyimide films.

5. The battery structure according to claim 1, wherein The chip is an LPC chip with an operating voltage between 3.0V - 5.0V, and the VCC pin and GND pin of the LPC chip are respectively connected to the two terminal posts.

6. The battery structure according to claim 1, characterized in that One end of the terminal post extends into the housing and is electrically connected to the electrode end of the battery core, and the other end is exposed outside the housing.

7. The battery structure according to claim 1, wherein, The overall shape of the battery structure is square.

8. The battery structure according to claim 5, characterized in that, The LPC chip includes a signal module, and the signal module is composed of a frame header and a frame response. The frame header is used for signal synchronization and signal source identification, and data transmission and verification are carried out in the frame response. After the chip obtains the pressure information from the pressure sensor, it can add a preset digital sequence before and after the data information segment in the frame response to achieve the encryption function during the transmission of the pressure signal, and then directly outputs the pressure information through the terminal post by using PLC technology.

9. A battery system, characterized in that, The battery system includes a plurality of the battery structures according to any one of claims 1 - 8, a demodulator, and a host computer. A plurality of the battery structures are connected in series, and the signals detected by the pressure sensors by the chips are transmitted to the demodulator through the terminal posts for demodulation, and then the demodulated data is transmitted to the host computer to realize the acquisition of the real-time pressure information inside the battery structure.

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