CN115799689A

CN115799689A - Blade battery with pressure sensing function

Info

Publication number: CN115799689A
Application number: CN202211427040.5A
Authority: CN
Inventors: 许克宇; 武斌; 许宙; 赵俊
Original assignee: Shenzhen Meisi Xianrui Electronic Co ltd
Current assignee: Shenzhen Meisi Xianrui Electronic Co ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-03-14

Abstract

The invention discloses a blade battery with a pressure sensing function, which comprises a shell and a battery cell group, wherein the battery cell group is arranged in the shell; the electric core group comprises a first pressure sensor, a second pressure sensor, a third pressure sensor, a first electric core, a second electric core and a third electric core, and the electric core group is stacked according to the sequence of the first pressure sensor, the first electric core, the second pressure sensor, the second electric core, the third electric core and the third pressure sensor. Compared with the prior art, the blade battery with the pressure sensing function has the advantages that the structural structure of the blade battery is improved, the thin film pressure sensors are arranged inside and on the surface of the blade battery pole core group, and when a single electric core goes wrong, the alarm signal can be rapidly provided.

Description

Blade battery with pressure sensing function

Technical Field

The invention relates to the technical field of batteries, in particular to a blade battery with a pressure sensing function.

Background

With the popularization of new energy automobiles, batteries are more and more widely applied, wherein lithium ion batteries have the characteristic of high energy density, but the electrode potential is the most negative, and lithium has the strongest metal activity in known elements including radioactive elements, so the lithium ion batteries have incomparable advantages compared with other batteries due to the physical and chemical properties of the lithium ion batteries, and meanwhile, the lithium ion batteries also have small potential safety hazards. During the use process, the occurrence of thermal runaway phenomenon needs to be prevented. The thermal runaway phenomenon, and its intensity, is related to the size, configuration, and number of battery cells of the battery. The cause may be overcharge, overdischarge, short circuit, high temperature, extrusion, collision, etc. The propagation process is extremely rapid, and the battery pack which is extremely easy to cause thermal runaway is easily ignited, even explodes and is natural, so that the life safety of personnel is directly threatened. On 1 month and 1 day of 2021, three mandatory national standards GB 18384-2020 electric vehicle safety requirements, GB 38032-2020 electric bus safety requirements and GB 38031-2020 power storage battery safety requirements for electric vehicles are officially implemented in China to further standardize the safety standards of electric vehicles. The thermal event alarm signal of the battery system and the standard of the thermal diffusion test of the battery system are increased, and the battery system does not fire or explode within 5 minutes after the thermal runaway of the battery monomer is required, so that the safe escape time is reserved for passengers.

The current common monitoring modes comprise voltage, smoke, temperature, pressure and expansion force. Wherein, the pressure monitoring mode is relatively mature. Since the pressure signature is very distinct during thermal runaway. When a single battery is out of control due to heat, the temperature is increased along with the temperature, the pressure in the whole battery pack can be rapidly increased, when the pressure in the battery pack is greater than the external pressure to a certain value, the explosion-proof valve of the battery pack can be opened instantly to release the internal pressure, and serious explosion accidents are prevented. However, in the existing scheme, the pressure sensors are all arranged near the explosion-proof valve of the battery pack, when the thermal runaway of the battery core occurs, the battery core which is at the beginning to generate the thermal runaway is random, the arranged sensors are too far away, the monitoring speed is influenced, the error is large, and the precision is not high.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention provides the blade battery with the pressure sensing function, and the film pressure sensors are arranged inside and on the surface of the blade battery pole core group by improving the structural structure of the blade battery with the pressure sensing function, so that when a single battery core has a problem, an alarm signal is rapidly provided.

The technical scheme adopted by the invention is as follows:

a blade battery with a pressure sensing function comprises a shell and a battery cell group, wherein the battery cell group is arranged in the shell; the electric core group comprises a first pressure sensor, a second pressure sensor, a third pressure sensor, a first electric core, a second electric core and a third electric core, and the electric core group is stacked according to the first pressure sensor, the first electric core, the second pressure sensor, the second electric core, the third electric core and the third pressure sensor.

In some embodiments, a first tab is disposed on one end of the housing.

In some embodiments, a second tab is disposed on one end of the housing, and the first tab and the second tab are disposed on different ends or the same end of the housing.

In some embodiments, a first interface is disposed on the housing.

In some embodiments, the housing is further provided with a second interface, and the first interface and the second interface are arranged at different ends or the same end of the housing.

In some embodiments, an explosion-proof valve is disposed on the housing.

In some embodiments, the first pressure sensor, the second pressure sensor, and the third pressure sensor are thin film piezoresistive pressure sensors and thin film capacitive pressure sensors.

In some embodiments, the housing is a square or cylinder in overall shape.

Compared with the prior art, the blade battery with the pressure sensing function, disclosed by the invention, has the advantages that the structural structure of the blade battery is improved, the film pressure sensors are arranged in the electrode core group and on the surface of the blade battery, and when a single battery core has a problem, an alarm signal can be rapidly provided.

Drawings

In order to more clearly explain the technical solution in the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be described below.

Fig. 1 is a schematic structural diagram of a blade battery with a pressure sensing function according to an embodiment of the present invention;

FIG. 2 is another schematic structural diagram of a blade battery with a pressure sensing function according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional structural view of a blade battery with a pressure sensing function according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a CTC battery system according to an embodiment of the present invention.

Reference numerals:

1. a blade battery; 101. a housing; 102. a first tab; 103. a first interface; 104. a second interface; 105. an explosion-proof valve; 106. a second tab; 2. the electric core group; 201. a first pressure sensor; 202. a first cell; 203. a second pressure sensor; 204. a second cell; 205. a third cell; 206. a third pressure sensor; 3. a CTP battery system.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The terms "first", "second", and the like in the embodiments of the present invention are only used for distinguishing related technical features, and do not indicate a sequential order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the present application, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used in other meanings besides orientation or positional relationship, for example, the term "upper" may also be used in some cases to indicate a certain attaching or connecting relationship. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components.

Electric motor car battery package takes place thermal runaway, and inside a large amount of heats and the gas of producing of its single electric core, in sealed battery package space, along with heat and the gaseous continuous accumulation of a large amount of effusions, internal pressure constantly increases thereupon, finally leads to the battery package shell to break, and a large amount of heats and gas are followed and erupt out, and adjacent electric core also can be infected rapidly, the thermal runaway appears in succession. The propagation process is extremely rapid, and the battery pack is extremely easy to fire or even explode caused by thermal runaway, so that the life safety of personnel is directly threatened. The safety problem of lithium cell is solved, can have very big promotion to the security of car, ensures to provide reliable alarm signal before dangerous the emergence. The common monitoring modes include voltage, smoke, temperature and pressure. Wherein, the pressure monitoring mode is relatively mature. Since the pressure signature is very distinct during thermal runaway. When a single battery is out of control due to heat, along with temperature rise and gas eruption, the pressure in the whole battery pack can be rapidly increased, and when the pressure in the battery pack is greater than the external pressure to a certain value, the explosion-proof valve of the battery pack can be opened instantly to release the internal pressure, so that serious explosion accidents are prevented.

The existing monitoring modes comprise voltage, smoke, temperature, pressure and expansive force. Wherein, the pressure monitoring mode is relatively mature. Since the pressure signature is very distinct during thermal runaway. When a single battery is out of control due to heat, along with temperature rise and gas eruption, the pressure in the whole battery pack can be rapidly increased, and when the pressure in the battery pack is greater than the external pressure to a certain value, the explosion-proof valve of the battery pack can be opened instantly to release the internal pressure, so that serious explosion accidents are prevented. However, in the existing scheme, the pressure sensors are all arranged near the explosion-proof valve of the battery pack, when the thermal runaway of the battery core occurs, the battery core in which the thermal runaway occurs at the beginning is random, the arranged sensors are too far away, the monitoring speed is influenced, the error is large, and the precision is not high.

Embodiments of the present invention aim to address one or more of the above problems. Through the blade battery of the sandwich-like structure of design, arrange film pressure sensor at blade battery utmost point core group inside and surface, when single electric core goes wrong, can be quick provide alarm signal.

Examples

The embodiment of the invention provides a blade battery with a pressure sensing function, and as shown in fig. 1-3, the blade battery 1 comprises a shell 101 and a battery cell group 2, wherein the battery cell group 2 is arranged in the shell 101; the electric core group 2 comprises a first pressure sensor 201, a second pressure sensor 203, a third pressure sensor 206, a first electric core 202, a second electric core 204 and a third electric core 205, and the electric core group 2 is stacked in sequence according to the first pressure sensor 201, the first electric core 202, the second pressure sensor 203, the second electric core 204, the third electric core 205 and the third pressure sensor 206. The housing 101 serves primarily to protect the internal structure of the sensor and at the same time matches the type of the electrical core used. For example, the overall shape of the casing 101 may be a square or a cylinder, etc. matching the cell type used. The size of the housing 101 is not limited to a single size and may be varied to other size configurations.

The electric core group 2 can monitor the expansion change condition in the electric core group 2 through a film pressure sensor, transmit the change data to an external BMS (Battery Management System, chinese: battery Management System) through an interface, and give an alarm signal depending on the internal judgment condition of the BMS. The pressure sensor principle structure in the pressure sensor module has diversity, and can be a film piezoresistive pressure sensor, a film capacitive pressure sensor and the like. The stack structure formed by combining the film pressure sensor and each layer of battery cell is not unique, and can be formed by arranging each layer of battery or arranging the battery on the upper layer and the lower layer.

In this embodiment, a first tab 102 is disposed on one end of the casing 101, a second tab 106 is disposed on one end of the casing 101, and the first tab 102 and the second tab 106 are disposed on different ends or the same end of the casing 101. And the lug realizes the output of the corresponding positive and negative power supplies.

In the present embodiment, the first interface 103 is provided on the housing 101.

In this embodiment, the housing 101 is further provided with a second interface 104, and the first interface 103 and the second interface 104 are disposed at different ends or the same end of the housing 101. The interface is used for transmitting the cell pressure change data.

In the present embodiment, the explosion-proof valve 105 is provided on the housing 101.

In the present embodiment, the first pressure sensor 201, the second pressure sensor 203, and the third pressure sensor 206 are a thin film piezoresistive pressure sensor or a thin film capacitive pressure sensor.

When taking place thermal runaway, the inside gaseous loss that takes place of electric core, lead to electric core internal pressure can sharply increase, blade electricity core can swell, multilayer film pressure sensor and multiunit blade electricity core become to pile up and arrange, constitute a class sandwich structure, it changes to take place the swell when certain one deck electricity core, the film pressure sensor of upper and lower floor can produce corresponding physical signal and change, through the inflation situation of change in the film pressure sensor monitoring electricity core group, change data transmission for outside BMS system through signal interface, rely on the BMS to embed the judgement condition and give alarm signal, rely on inside algorithm to judge whether take place thermal runaway, carry out timely effectual control to blade battery thermal runaway.

Meanwhile, a plurality of blade batteries 1 form a battery array group, namely a CTP battery system 3, by means of a CTP integration technology, as shown in FIG. 4, the whole safety of the lithium battery of the electric vehicle is greatly improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The blade battery with the pressure sensing function is characterized by comprising a shell (101) and a battery cell group (2), wherein the battery cell group (2) is arranged in the shell (101);

the electric core group (2) comprises a first pressure sensor (201), a second pressure sensor (203), a third pressure sensor (206), a first electric core (202), a second electric core (204) and a third electric core (205), and the electric core group (2) is stacked according to the first pressure sensor (201), the first electric core (202), the second pressure sensor (203), the second electric core (204), the third electric core (205) and the third pressure sensor (206) in sequence.

2. The pressure sensing bladed battery of claim 1, characterized in that the housing (101) has a first tab (102) provided on one end thereof.

3. The blade battery with the pressure sensing function according to claim 2, wherein a second tab (106) is arranged on one end of the housing (101), and the first tab (102) and the second tab (106) are arranged on different ends or the same end of the housing (101).

4. A blade battery with pressure sensing function according to any of claims 1-3, characterized in that the housing (101) is provided with a first interface (103).

5. The blade battery with the pressure sensing function according to claim 4, wherein a second interface (104) is further arranged on the housing (101), and the first interface (103) and the second interface (104) are arranged at different ends or the same end of the housing (101).

6. A blade battery with pressure sensing function according to any of claims 1-3, characterized in that the housing (101) is provided with an explosion-proof valve (105).

7. The blade battery with the pressure sensing function according to any one of claims 1 to 3, wherein the first pressure sensor (201), the second pressure sensor (203) and the third pressure sensor (206) are a thin film piezoresistive pressure sensor and a thin film capacitive pressure sensor.

8. A blade battery with pressure sensing function according to any one of claims 1-3, characterized in that the housing (101) has the overall shape of a square or a cylinder.