Battery monomer, battery module and battery pack

Abstract

The utility model discloses a battery monomer, a battery module and a battery pack, the battery monomer is used for a battery, the battery comprises a BMS, the battery monomer comprises a shell, a pressure detection piece and a switch piece, the shell is internally provided with an accommodating cavity, the shell is provided with a first mounting hole communicated with the accommodating cavity, and the BMS is positioned on the outer side of the shell; the pressure detection piece is located on the inner side of the shell and electrically connected with the BMS, and the pressure detection piece is used for detecting the air pressure in the containing cavity; the switch piece is located at the first mounting hole and electrically connected with the BMS, and the BMS is used for controlling the switch piece to be turned on or turned off. According to the single battery disclosed by the utility model, the switch piece is positioned at the first mounting hole, the BMS is used for controlling the switch piece to be opened or closed, and when the switch piece is opened, gas in the accommodating cavity can be exhausted through the first mounting hole, so that further expansion of the single battery can be reduced, and the effects of prolonging the service life of a battery pack and improving the use safety are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a battery monomer, battery module and battery package. BACKGROUND

[0002] In the related art, the battery monomer produces trace carbon dioxide, carbon monoxide and methane and other gases in the use process, and with the increase of cycle number, the amount of gas also gradually increases.These gases continuously gather in the battery monomer, make the inflation force in the battery cell more and more big, eventually lead to the serious bulging phenomenon of battery monomer. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art is solved, for this, one purpose of the utility model is to propose a battery monomer, the gas in the battery monomer can be discharged through the first installation hole, can reduce the further expansion of battery monomer, thereby play the role of prolonging the service life and use safety of battery package.

[0004] The utility model discloses still propose a battery module with above-mentioned battery monomer.

[0005] The utility model discloses still propose a battery with above-mentioned battery module.

[0006] According to the battery monomer of the first aspect embodiment of the utility model, for battery, the battery includes BMS, the battery monomer includes: shell, the shell has the accommodation cavity in, the shell has the first installation hole with the accommodation cavity intercommunication, the BMS is located the outside of the shell, pressure detection piece, the pressure detection piece is located the inside of the shell and is connected with the BMS electricity, and the pressure detection piece is used to detect the air pressure in the accommodation cavity, switch piece, the switch piece is located the first installation hole and is connected with the BMS electricity, and the BMS is used to control the opening or closing of the switch piece.

[0007] According to the battery monomer of the utility model embodiment, the switch piece is located the first installation hole, and the BMS is used to control the opening or closing of the switch piece, when the opening of the switch piece, the gas in the accommodation cavity can be discharged through the first installation hole, can reduce the further expansion of battery monomer, thereby play the role of prolonging the service life and use safety of battery package.

[0008] According to some embodiments of the utility model, the switch piece includes a ball valve.

[0009] According to some embodiments of the utility model, the switch piece includes a drive motor, the drive motor is connected to the BMS, and the drive motor is in transmission connection with the ball valve.

[0010] According to some embodiments of the present application, a transmission member is arranged between the ball valve and the driving motor, and the transmission member comprises a first gear and a second gear which are engaged with each other.

[0011] According to some embodiments of the present application, the shell further has a second mounting hole which is in communication with the accommodating cavity, the second mounting hole is spaced apart from the first mounting hole, and the pressure detection member comprises a connecting lead wire which is arranged in the second mounting hole and connected with the BMS.

[0012] According to some embodiments of the present application, the pressure detection member comprises a pressure sensor.

[0013] According to some embodiments of the present application, the shell is provided with a groove on a side facing the accommodating cavity, and the groove is used for accommodating the pressure sensor.

[0014] According to some embodiments of the present application, the pressure detection member is provided with a shielding film on a side facing the accommodating cavity.

[0015] According to the battery module of the second aspect of the present application, the battery module comprises at least one battery cell according to the first aspect of the present application.

[0016] According to the battery module of the present application, when the opening member is opened, the gas in the accommodating cavity can be discharged through the first mounting hole, and the further expansion of the battery cell can be reduced, thereby prolonging the service life and use safety of the battery pack.

[0017] According to the battery pack of the third aspect of the present application, the battery pack comprises the battery module according to the second aspect of the present application.

[0018] According to the battery pack of the present application, by arranging the above-mentioned battery module, the further expansion of the battery cell can be reduced, thereby prolonging the service life and use safety of the battery pack.

[0019] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, with reference to the following figures, in which:

[0021] Figure 1 is a partial schematic view of a battery cell according to some embodiments of the present application.

[0022] LIST OF REFERENCE NUMERALS

[0023] 10, housing; 11, first mounting hole; 12, second mounting hole;

[0024] 21, pressure sensor; 22, ball valve; 23, driving motor; 24, first gear; 25, second gear. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only for explaining the present application, and should not be understood as a limitation of the present application.

[0026] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as a limitation of the present application. In addition, the terms "first", "second" are only for the purpose of description, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0027] In the description of the present application, it should be noted that, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] The following description will be made with reference to the drawings Figure 1 The battery cell according to the embodiments of the present application is described.

[0029] The battery monomer is used for a battery, the battery comprises a BMS, the BMS is a battery management system (Battery Management System), in the field of electric vehicles, energy storage systems and the like, the BMS is a system for monitoring and managing the state of the battery pack, including temperature, voltage, current and the like, to ensure that the battery can work safely and efficiently.

[0030] The battery monomer comprises a shell 10 and a pressure detection piece, the shell 10 has a containing cavity inside, the pole group of the battery monomer is located in the containing cavity, and a cover plate is arranged at the opening of the shell 10 and used for closing the containing cavity. The BMS is located on the outer side of the shell 10, the outer side of the shell 10 is a side away from the center of the shell 10, and a plurality of battery monomers can share one BMS. The pressure detection piece is located on the inner side of the shell 10, the inner side of the shell 10 is a side close to the center of the shell 10, and the pressure detection piece is electrically connected with the BMS.

[0031] The battery monomer comprises a switch piece, the shell 10 has a first mounting hole 11 in communication with the containing cavity, the switch piece is located at the first mounting hole 11, and the switch piece is electrically connected with the BMS. When the BMS obtains the value of the gas pressure detected by the pressure detection piece and learns through analysis that the value in the containing cavity is higher than the highest gas pressure threshold of the containing cavity, the BMS controls the switch piece to be opened, so that the containing cavity is in communication with the outside through the first mounting hole 11, and the gas in the containing cavity can be discharged through the first mounting hole 11. When the BMS obtains the value of the gas pressure detected by the pressure detection piece after a certain time of discharge, and learns through analysis that the value in the containing cavity is lower than the lowest gas pressure threshold of the containing cavity, the BMS controls the switch piece to be closed, so that the first mounting hole 11 is closed, and the gas in the containing cavity cannot be discharged through the first mounting hole 11.

[0032] For example, the switch piece can comprise a driving motor 23 and a plate body, the plate body is arranged on the first mounting hole 11, when it is needed to open the first mounting hole 11, the driving motor 23 drives the plate body to move, and when it is needed to close the first mounting hole 11, the driving motor 23 drives the plate body to reset.

[0033] In one specific example, the value of the air pressure detected by the pressure detection member is transmitted to the BMS, and the BMS learns through analysis that the value in the containing cavity is higher than the highest air pressure threshold of the containing cavity, and on the basis of opening the switch member, the upper limit window of the SOC used by the battery pack (the upper limit window of the SOC used by the battery pack is the maximum allowable charging level of the battery, that is, a limit that the state of charge of the battery should not exceed) can also be adjusted to reduce the upper limit window of the SOC used by the battery pack, so as to slow down the further gas production of the battery monomer, so as to prolong the service life of the battery pack and improve the safety of the battery pack.

[0034] According to the battery monomer provided in the embodiment of the utility model, the switch member is located at the first mounting hole 11, and the BMS is used for controlling the opening or closing of the switch member, when the switch member is opened, the gas in the containing cavity can be discharged through the first mounting hole 11, and the further expansion of the battery monomer can be reduced, thereby prolonging the service life and safety of the battery pack.

[0035] According to some embodiments of the utility model, referring to Figure 1 The switch member includes a ball valve 22, and the ball valve 22 is arranged at the first mounting hole 11, when the through hole in the ball valve 22 is communicated with the first mounting hole 11, the gas in the containing cavity can be discharged through the ball valve 22. The ball valve 22 has the advantages of simple structure, convenient operation and sealing performance, and when exhaust is not needed, the ball valve 22 can be sealed at the first mounting hole 11 to prevent gas leakage through the first mounting hole 11.

[0036] According to some embodiments of the utility model, referring to Figure 1 The switch member includes a driving motor 23, and the driving motor 23 is connected to the BMS, and the driving motor 23 is in transmission connection with the ball valve 22. When exhaust is needed, the BMS controls the driving motor 23 to work, the handle of the driving motor 23 drives the ball valve 22 to rotate when the driving motor 23 works, and then the ball valve 22 is driven to rotate, so that the through hole of the ball valve 22 is communicated with the first mounting hole 11, thereby performing exhaust. By driving the ball valve 22 to open or close the first mounting hole 11 through the driving motor 23, the automation of opening or closing the first mounting hole 11 can be realized.

[0037] According to some embodiments of the utility model, referring to Figure 1 A transmission member is arranged between the ball valve 22 and the driving motor 23, the transmission member includes a first gear 24 and a second gear 25 that are in meshing relationship, the first gear 24 is coaxially driven with the driving shaft of the driving motor 23, the second gear 25 is coaxially rotated with the handle of the ball valve 22, and the first gear 24 is in meshing relationship with the second gear 25, and the driving motor 23 can be arranged to the radial side of the handle of the ball valve 22, so that the space outside the shell 10 can be reasonably utilized.

[0038] According to some embodiments of the utility model, referring to Figure 1The shell 10 further has a second mounting hole 12 in communication with the accommodating cavity, the second mounting hole 12 is spaced apart from the first mounting hole 11, and the pressure detection member comprises a connecting lead wire which is arranged in the second mounting hole 12 and connected with the BMS, so that the signal transmitted from the pressure detection member to the BMS can be ensured to be stable and reliable.

[0039] For example, the connecting lead wire is sleeved with a sealing ring on the outer circumferential side, the sealing ring is located in the second mounting hole 12, and is used for sealing the gap between the connecting lead wire and the shell 10 to prevent gas from leaking from the gap.

[0040] According to some embodiments of the utility model, referring to Figure 1 The pressure detection member comprises a pressure sensor 21, the pressure sensor 21 can measure the pressure of the gas and convert the pressure change into readable electrical signals transmitted to the BMS, and the pressure sensor 21 has the advantages of simple structure, low cost and stable and reliable pressure measurement.

[0041] For example, the pressure sensor 21 can comprise a strain gauge pressure sensor, a piezoresistive pressure sensor or a capacitive pressure sensor.

[0042] According to some embodiments of the utility model, referring to Figure 1 The shell 10 is provided with a groove on the side facing the accommodating cavity, the groove is used for accommodating the pressure sensor 21, and the surface of the pressure sensor 21 can be coplanar with the surface of the shell 10, so that the pole group in the accommodating cavity can be prevented from colliding with the pressure sensor 21.

[0043] According to some embodiments of the utility model, referring to Figure 1 The pressure detection member is provided with a shielding film on the side facing the accommodating cavity, the accommodating cavity stores electrolyte, and the shielding film can prevent the electrolyte from corroding the pressure detection member, so that the service life of the pressure detection member can be improved.

[0044] For example, the shielding film can be pasted on the pressure detection member by means of adhesion, and the material of the shielding film can be one of polyimide, PET plastic, polyether ether ketone, aramid or aromatic polyamide, epoxy resin, silicone rubber and epoxy resin.

[0045] The battery module according to the second aspect of the utility model comprises at least one battery monomer according to the first aspect of the utility model, one battery module can be provided with one battery monomer of the application, or can be provided with a plurality of battery monomers of the application.

[0046] The battery module comprises a plurality of battery monomers, wherein the battery monomer of the application can be provided with one in the middle of the battery module; the battery monomer of the application can be provided with two in the battery module, and the two battery monomers of the application can be respectively located at two ends of the battery module; the battery monomer of the application can be provided with three in the battery module, wherein two battery monomers of the application can be respectively located at two ends of the battery module, and the other battery monomer of the application is located in the middle of the battery module.

[0047] According to the battery module of the embodiment of the application, when the switch is opened, the gas in the accommodating cavity can be discharged through the first mounting hole 11, and the further expansion of the battery monomer can be reduced, thereby prolonging the service life and use safety of the battery pack.

[0048] According to the battery pack of the third aspect of the embodiment of the application, the battery module of the second aspect of the embodiment of the application is provided.

[0049] According to the battery pack of the embodiment of the application, the further expansion of the battery monomer can be reduced by providing the above battery module, thereby prolonging the service life and use safety of the battery pack.

[0050] In the description of the present application, the description of the terms "some embodiments", "optionally", "further", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiments or examples are contained in at least one embodiment or example of the application. In the present application, the illustrative description of the above terms does 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.

[0051] Although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. A battery cell for use in a battery, characterized by The battery comprises a BMS, and the battery cell comprises: a housing having a receiving cavity therein, the housing having a first mounting hole in communication with the receiving cavity, the BMS being located outside the housing; a pressure detecting member located inside the housing and electrically connected with the BMS, the pressure detecting member being used for detecting the air pressure in the receiving cavity; a switch member located at the first mounting hole and electrically connected with the BMS, the BMS being used for controlling the opening or closing of the switch member.

2. The battery cell of claim 1, wherein, The switch member comprises a ball valve.

3. The battery cell of claim 2, wherein, The switch member comprises a driving motor connected with the BMS, the driving motor being in transmission connection with the ball valve.

4. The battery cell of claim 3, wherein, A transmission member is arranged between the ball valve and the driving motor, the transmission member comprising a first gear and a second gear in meshing connection with each other.

5. The battery cell of claim 1, wherein, The housing further has a second mounting hole in communication with the receiving cavity, the second mounting hole being spaced apart from the first mounting hole, the pressure detecting member comprising a connecting lead wire, the connecting lead wire being arranged through the second mounting hole and connected with the BMS.

6. The battery cell of claim 1, wherein, The pressure detecting member comprises a pressure sensor.

7. The battery cell of claim 6, wherein, The housing is provided with a recess on a side thereof facing the receiving cavity, the recess being used for accommodating the pressure sensor.

8. The battery cell of claim 6, wherein, The pressure detecting member is provided with a shielding film on a side thereof facing the receiving cavity.

9. A battery module, characterized by The battery comprises: at least one battery cell according to any one of claims 1-8.

10. A battery pack, characterized by, The battery comprises: the battery module according to claim 9.

Images