CN115395187B - Self-protection system of electric automobile power battery and electric automobile power battery - Google Patents
Self-protection system of electric automobile power battery and electric automobile power battery Download PDFInfo
- Publication number
- CN115395187B CN115395187B CN202110571632.3A CN202110571632A CN115395187B CN 115395187 B CN115395187 B CN 115395187B CN 202110571632 A CN202110571632 A CN 202110571632A CN 115395187 B CN115395187 B CN 115395187B
- Authority
- CN
- China
- Prior art keywords
- battery module
- battery
- slip ring
- damaged
- plunger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 230000000712 assembly Effects 0.000 claims description 15
- 238000000429 assembly Methods 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 14
- 239000003292 glue Substances 0.000 claims description 11
- 238000004880 explosion Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003031 high energy carrier Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a self-protection system of an electric automobile power battery and the electric automobile power battery, wherein the power battery comprises a hollow battery shell and a plurality of battery modules which are arranged in the battery shell and connected in series; the self-protection system comprises: the battery module control unit, the detection unit which is respectively arranged at the bottom of each battery module and is positioned in the battery shell, and the short-circuit device which is respectively arranged outside each battery module; the battery module control unit is respectively connected with each detection unit and each short-circuit device; the battery module control unit determines a corresponding damaged battery module in the battery modules according to the detection result of the detection unit, generates a damaged signal and sends the damaged signal to a corresponding short-circuit device; the corresponding short-circuiting device short-circuits the corresponding damaged battery module according to the received damaged signal. Therefore, the extruded battery module is prevented from being out of control due to continuous power supply, and sudden interruption of power is avoided.
Description
Technical Field
The invention belongs to the field of electric automobiles, and particularly relates to a self-protection system of an electric automobile power battery and the electric automobile power battery.
Background
In recent years, electric automobiles are already becoming an important direction of development of the government of China under the influence of multiple factors such as energy safety, environmental protection, technical progress, industrial upgrading and the like. However, it is counted that more than 50% of new energy automobile accidents are associated with power cell systems. The power battery system is a high-energy carrier, and the stability, reliability and safety of the power battery system determine the reliability and safety of the whole vehicle to a great extent. Among the many factors of power battery system faults, the battery pack is subjected to bottom impact, the module is easy to fire and explode, bad results are brought, for example, 2019, 4 months and 20 days, one ULAES 8 is maintained at a website, a maintenance report project does not relate to a chassis, and chassis detection is not carried out on a rack. The maintenance is completed on day 21 and the vehicle starts to get on fire on day 22 afternoon. The Utility officials draw preliminary conclusions through investigation: the chassis of the vehicle is subjected to severe impact before repair, so that the left rear shell of the power battery pack and the cooling plate deform in a large area. The internal structure of the battery pack forms a short circuit after a period of time in a pressed state, and finally fires.
Disclosure of Invention
The invention aims to solve the problem that in the prior art, the battery is easy to cause short circuit of all battery modules when being impacted by the bottom, so that the battery is ignited and exploded. The invention provides a self-protection system of an electric vehicle power battery and the electric vehicle power battery, wherein after the bottoms of one or more battery modules are extruded, the positions of the extruded battery modules can be accurately positioned through the self-protection system, and the extruded battery modules can be automatically short-circuited, but the passages of other battery modules are maintained.
In order to solve the technical problems, the embodiment of the invention discloses a self-protection system of an electric automobile power battery, wherein the power battery comprises a hollow battery shell and a plurality of battery modules which are arranged inside the battery shell and connected in series; the self-protection system comprises: the battery module control unit is respectively arranged at the bottom of each battery module and is positioned in the battery shell, and the plurality of short-circuit devices are respectively arranged outside each battery module; the battery module control unit is respectively connected with each detection unit and each short-circuit device; the battery module control unit determines a corresponding damaged battery module in the battery modules according to the detection result of the detection unit, generates a damaged signal and sends the damaged signal to a corresponding short-circuit device; the corresponding short-circuiting device is electrically connected with the battery modules at the two adjacent ends of the corresponding damaged battery module according to the received damaged signal so as to short-circuit the corresponding damaged battery module.
By adopting the technical scheme, a plurality of battery modules are connected in series, when the bottom of one or a plurality of battery modules is impacted, the battery modules are extruded and even pierced to be damaged, and the battery module control unit determines the corresponding damaged battery module in the battery modules according to the detection result of the detection unit arranged at the bottom of the battery modules and generates a damage signal, so that the damaged battery module position can be accurately positioned. In addition, the battery module control unit sends the damaged signal to the corresponding short-circuiting device of the damaged battery module, and the corresponding short-circuiting device is electrically connected with the battery modules at two adjacent ends of the corresponding damaged battery module after receiving the damaged signal, so that the extruded battery module can be automatically shorted, but the paths of other battery modules are kept, and the power battery pack can still output power in a short time, thereby avoiding thermal runaway of the extruded battery module caused by continuous power supply, and avoiding severe accidents such as vehicle collision and the like caused by sudden power interruption.
According to another specific embodiment of the invention, the self-protection system of the electric automobile power battery disclosed by the embodiment of the invention comprises a resistance wire and a resistance element; the resistance wire of each detection unit is paved at the bottom of a corresponding battery module, one end of the resistance wire of each detection unit is connected with the battery module control unit through a corresponding resistance element, and the other end of the resistance wire of each detection unit is also connected with the battery module control unit.
By adopting the technical scheme, a plurality of battery modules are connected in series, the resistance wire of each detection unit is paved at the bottom of a corresponding battery module, both ends of the resistance wire of each detection unit are connected with the battery module control unit, when the bottom of one or a plurality of battery modules is impacted, the resistance wire at the bottom of the battery module is broken, and the battery module control unit determines the position of the corresponding damaged battery module in the battery module according to the resistance of the broken resistance wire and generates a damage signal.
According to another specific embodiment of the invention, the self-protection system of the electric automobile power battery disclosed by the embodiment of the invention comprises a conducting rod arranged on the outer side of the upper part of each battery module, two slip ring guide rods respectively symmetrically arranged at two ends of each battery module, and two sliding assemblies respectively symmetrically arranged at two ends of each battery module; one end of each slip ring guide rod is connected with the corresponding battery module through a conductive rod, and the other end of each slip ring guide rod is connected with the corresponding battery module; each slip ring guide rod comprises a first conductive part, a second conductive part and an insulating part arranged between the first conductive part and the second conductive part; one end of the second conductive part far away from the first conductive part is connected with the conductive rod, and one end of the first conductive part far away from the second conductive part is connected with the battery module; the sliding component arranged at the same end of the battery module is in sliding connection with the slip ring guide rod, so that the sliding component is connected with the first conductive part or the second conductive part or the insulating part. The two sliding assemblies of the damaged battery module receive the damaged signal and slide to the positions connected with the corresponding second conductive parts respectively according to the damaged signal, so that the conductive rods of the damaged battery module, the two slip ring guide rods, the two sliding assemblies and the battery modules at the two adjacent ends of the damaged battery module are electrically connected, and the damaged battery module is in short circuit.
By adopting the technical scheme, after the damaged battery module receives the damaged signal sent by the battery module control unit, two sliding assemblies corresponding to one damaged battery module slide to the second conductive part positions of the corresponding slip ring guide rods, and the conductive rod, the two slip ring guide rods, the two sliding assemblies and the battery modules at the two adjacent ends of the damaged battery module are electrically connected, so that the damaged battery module is in short circuit.
According to another embodiment of the invention, the self-protection system of the electric automobile power battery disclosed by the embodiment of the invention comprises a slip ring, a slip ring plunger, a point explosion line, a plunger cavity and a gas generator; grooves are formed in two ends of the battery module, and the grooves form plunger cavities; the slip ring plunger is arranged in the plunger cavity and is in sliding connection with the plunger cavity; the sliding ring is arranged at one end of the sliding ring plunger close to the sliding ring guide rod, the sliding ring is provided with a through hole, the sliding ring guide rod penetrates through the through hole and is in sliding connection with the sliding ring through the through hole, so that the through hole of the sliding ring is connected with the first conductive part or the second conductive part or the insulating part; the explosion-proof line is arranged inside the sliding ring plunger, penetrates through the sliding ring plunger and is connected with the bottoms of the sliding ring and the sliding ring plunger; the gas generator is arranged at one end of the explosion wire, which is far away from the slip ring, and is arranged in the plunger cavity and outside the slip ring plunger. The gas generator of the damaged battery module is used for receiving the damaged signal, the gas generator corresponding to the damaged signal is ignited, the corresponding slip ring plunger is pushed to slide, so that the through hole of the corresponding slip ring is connected with the corresponding second conductive part, the conductive rod of the damaged battery module, the slip ring guide rod, the slip ring and the battery modules at the two adjacent ends of the damaged battery module are electrically connected, and the damaged battery module is in short circuit.
By adopting the technical scheme, after the damaged battery module receives the damaged signal sent by the battery module control unit, the gas generators of the two sliding assemblies corresponding to the damaged battery module are ignited, the gas pressure in the plunger cavity is increased, the corresponding slip ring plunger is pushed to slide, so that the corresponding through hole is connected with the corresponding second conductive part, the conductive rod, the slip ring guide rod, the slip ring and the battery modules at the two adjacent ends of the damaged battery module are electrically connected, and the damaged battery module is in short circuit.
According to another specific embodiment of the invention, the self-protection system of the electric automobile power battery disclosed by the embodiment of the invention further comprises an elastic element, wherein the elastic element is arranged in the plunger cavity and is positioned at the outer side of the slip ring plunger close to the gas generator; one end of the elastic element is connected with the bottom of the slip ring plunger, and the other end of the elastic element is connected with the bottom of the plunger cavity.
By adopting the technical scheme, after the gas generator is ignited, the air pressure in the plunger cavity is increased, the corresponding slip ring plunger is pushed to slide, the elastic element is driven to stretch, the pulled elastic element has restoring force, the slip ring plunger can be adjusted to slide, and the slip ring is in stable contact with the second conductive part of the slip ring guide rod.
According to another specific embodiment of the invention, the self-protection system of the electric automobile power battery disclosed by the embodiment of the invention further comprises a pressure balance cavity and a pressure relief valve, wherein the pressure balance cavity is arranged on one side of the plunger cavity, and the pressure balance cavity is connected with the plunger cavity through the pressure relief valve.
By adopting the technical scheme, after the gas generator is ignited, the air pressure in the plunger cavity is increased to push the corresponding slip ring plunger to slide, and a certain amount of air is released to the pressure balance cavity through the pressure release valve to adjust the air pressure in the plunger cavity, so that the slip ring is further in stable contact with the second conductive part of the slip ring guide rod.
According to another specific embodiment of the invention, the self-protection system of the electric automobile power battery disclosed by the embodiment of the invention further comprises a solid glue, the bottom of the battery module is connected with the battery shell through the solid glue, and the resistance wire is arranged in the solid glue.
By adopting the technical scheme, the bottom of the battery module is fixedly connected with the battery shell through the solid glue, so that the battery module is prevented from being rocked inside the battery shell to cause damage in the running process of the electric automobile. The resistance wire is arranged in the solid glue, so that the breakage of the resistance wire when slight impact occurs can be avoided.
According to another specific embodiment of the invention, the self-protection system disclosed by the embodiment of the invention further comprises a transformer, wherein one end of the transformer is connected with the output end of the power battery; the other end of the transformer is connected with the battery module control unit.
By adopting the technical scheme, after the transformer receives the damaged signals sent by the battery module control unit, the output voltage of the power battery can be adjusted according to the number of the damaged battery modules which are short-circuited, so that the power battery still has stable voltage output in a short time after part of the battery modules are damaged.
According to another specific embodiment of the invention, the self-protection system of the electric automobile power battery disclosed by the embodiment of the invention further comprises a conductive flexible wire, and one ends of the explosion wires of two adjacent battery modules close to the slip ring are connected through the conductive flexible wire.
By adopting the technical scheme, two adjacent battery modules are connected in series through the conductive flexible wires, and the structure is simple.
The embodiment of the invention also discloses an electric automobile power battery, which comprises: the embodiment of the invention also discloses a self-protection system of the power battery of the electric automobile; the self-protection system of the electric automobile power battery is electrically connected with each battery module.
The beneficial effects of the invention are as follows:
the invention provides a self-protection system of an electric vehicle power battery, wherein a plurality of battery modules are connected in series, when the bottom of one or more battery modules is impacted, the battery modules are extruded and even penetrated and damaged, and a battery module control unit determines the corresponding damaged battery module in the battery modules according to the detection result of a detection unit arranged at the bottom of the battery modules and generates a damage signal, so that the damaged battery module position can be accurately positioned. In addition, the battery module control unit sends the damaged signal to the corresponding short-circuiting device of the damaged battery module, and the corresponding short-circuiting device is electrically connected with the undamaged battery modules at the two adjacent ends of the corresponding damaged battery module after receiving the damaged signal, so that the extruded battery module can be automatically shorted, but the paths of other battery modules are kept, so that the power can be still output in a short time, the extruded battery module is prevented from being out of control due to continuous power supply, and severe accidents such as vehicle collision and the like are avoided.
Drawings
Fig. 1 is a schematic diagram of a frame structure of a self-protection system of an electric vehicle power battery according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electric vehicle power battery and a self-protection system thereof according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a battery module and a self-protection system thereof of an electric vehicle power battery according to an embodiment of the invention;
fig. 4 is a schematic cross-sectional structure diagram of a battery module and a self-protection system of the battery module of the electric vehicle power battery according to the embodiment of the invention.
Reference numerals illustrate:
100: a battery case;
200: a battery module;
300: a battery module control unit;
400: a detection unit;
410: a resistance wire; 420: solid glue;
500: a short circuit device;
510: a conductive rod;
520: slip ring guide rod;
521: a first conductive portion; 522: a second conductive portion; 523: an insulating part;
530: a sliding assembly;
531: a slip ring; 532: a slip ring plunger; 533: igniting a wire; 534: a gas generator; 535: a plunger cavity; 536: an elastic element;
540: a pressure balancing chamber;
550: a pressure release valve;
600: a transformer;
700: conductive flexible wires.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present invention with specific examples. While the description of the invention will be described in connection with the preferred embodiments, it is not intended to limit the inventive features to the implementation. Rather, the purpose of the invention described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the invention. The following description contains many specific details for the purpose of providing a thorough understanding of the present invention. The invention may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the invention. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
It should be noted that in this specification, like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present embodiment, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present invention.
The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
In the description of the present embodiment, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present embodiment can be understood in a specific case by those of ordinary skill in the art.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1 to 4, the embodiment of the present invention discloses a self-protection system of a power battery of an electric vehicle, the power battery including a hollow battery case 100 and a plurality of battery modules 200 disposed inside the battery case 100 and connected in series. The self-protection system comprises: the battery module control unit 300, a plurality of detection units 400 respectively disposed at the bottom of each battery module 200 and inside the battery case 100, and a plurality of short-circuiting devices 500 respectively disposed at the outside of each battery module 200; wherein the battery module control unit 300 is connected with each of the sensing units 400 and each of the short circuit devices 500, respectively; and the battery module control unit 300 determines the corresponding damaged battery module 200 among the battery modules 200 according to the detection result of the detection unit 400 and generates a damaged signal, and transmits the damaged signal to the corresponding short-circuiting device 500; the corresponding short circuit device 500 is electrically connected with the battery modules 200 at the adjacent ends of the corresponding damaged battery module 200 according to the received damage signal, so as to short-circuit the corresponding damaged battery module 200.
The battery case 100 may be a square case or a cylindrical case, and this embodiment is not particularly limited. If a plurality of battery modules 200 disposed inside the battery case 100 and connected in series are referred to as a group of battery modules, the power battery may include a plurality of groups of battery modules. The sensing unit 400 may be provided at the upper part and the side of the battery module 200 in addition to the bottom of each battery module 200, and may be provided as required by those skilled in the art.
With the above technical solution, the plurality of battery modules 200 are connected in series, when the bottom of one or more battery modules 200 is impacted, the battery modules 200 are extruded and even pierced to be damaged, and the battery module control unit 300 determines the corresponding damaged battery module 200 in the battery modules 200 according to the detection result of the detection unit 400 disposed at the bottom of the battery modules 200 and generates a damage signal, so that the damaged battery module 200 can be accurately positioned. In addition, the battery module control unit 300 transmits the damaged signal to the corresponding short-circuiting device 500 of the damaged battery module 200, and the corresponding short-circuiting device 500 is electrically connected with the battery modules 200 at the two adjacent ends of the damaged battery module 200, so that the damaged battery module 200 which is extruded and punctured can be automatically short-circuited, but the paths of other battery modules 200 are maintained, so that the power battery pack can still output power in a short time, and thus, the thermal runaway of the damaged battery module 200 caused by continuous power supply can be avoided, and the severe accidents such as vehicle collision and the like caused by sudden power interruption can be avoided.
In one embodiment, each detection unit 400 includes a resistance wire 410 and a resistance element (not shown); the resistance wire 410 of each sensing unit 400 is laid at the bottom of a corresponding one of the battery modules 200, and one end of the resistance wire 410 of each sensing unit 400 is connected with the battery module control unit 300 through a corresponding resistance element, and the other end is also connected with the battery module control unit 300.
As shown in fig. 3, in the present embodiment, the resistance wire 410 may be a linear resistance wire, a U-shaped conductive wire, or a wave-shaped resistance wire, which may be set by those skilled in the art according to actual needs.
It should be noted that, the different resistance wires 410 are connected to different pairs of PINs (PINs) of the battery module control unit 300, i.e., the different PINs represent the different resistance wires 410 at the bottom of the battery module 200. For example, if the power battery includes N battery modules 200, two ends of the resistance wire 410 at the bottom of each battery module 200 are connected to 2 PINs 1, 2 PINs 2, … …, and 2 PINs nn of the battery module control unit 300, respectively. The resistance wire 410 is in a normal state, and the resistance is 0; if the bottom of the battery module 200 is in an impact state, the resistance wire 410 of the bottom of the battery module 200 breaks, and the resistance is infinite. When the resistance wire 410 of the nth battery module 200 breaks, the battery module control unit 300 receives the state change of the PINN end thereof, that is, the resistance of the resistance wire 410 of the nth battery module 200 changes from 0 to infinity, so that it can be determined that the nth battery module 200 is impacted or pierced, that is, it is determined that the battery module 200 is damaged.
With the above technical solution, the plurality of battery modules 200 are connected in series and the resistance wire 410 of each detection unit 400 is laid at the bottom of a corresponding one of the battery modules 200, the resistance wire 410 of each detection unit 400 is connected with the battery module control unit 300, when the bottom of one or more battery modules 200 is impacted, the resistance wire 410 at the bottom of the battery module 200 is broken, and the battery module control unit 300 determines the corresponding damaged battery module 200 in the battery module 200 and generates a damage signal according to the broken resistance wire 410.
As shown in fig. 4, in one embodiment, each short circuit device 500 includes a conductive rod 510 disposed at the upper outer side of each battery module 200, two slip ring guide rods 520 symmetrically disposed at both ends of each battery module 200, respectively, and two sliding members 530 symmetrically disposed at both ends of each battery module 200, respectively. One end of the two slip ring guide rods 520 is connected with the battery module 200 through the conductive rod 510, and the other end of the slip ring guide rods is connected with the battery module 200; each slip ring guide 520 includes a first conductive portion 521, a second conductive portion 522, and an insulating portion 523 disposed between the first conductive portion 521 and the second conductive portion 522; wherein, one end of the second conductive part 522 far from the first conductive part 521 is connected with the conductive rod 510, and one end of the first conductive part 521 far from the second conductive part 522 is connected with the battery module 200; the sliding assembly 530 provided at the same end of the battery module 200 is slidably coupled with the slip ring guide 520 such that the sliding assembly 530 is coupled with the first conductive part 521 or the second conductive part 522 or the insulating part 523. The two sliding members 530 of the damaged battery module 200 receive the damage signal, and the two sliding members 530 are respectively slid to the positions connected with the corresponding second conductive parts 522 according to the damage signal, so that the conductive rods 510, the two slip ring guide rods 520, the two sliding members 530 of the damaged battery module 200, and the battery modules 200 at the adjacent ends of the damaged battery module 200 are electrically connected to short-circuit the damaged battery module 200.
In this embodiment, the conductive rod 510 may be disposed on the outer side of the upper portion of each battery module 200, or may be disposed on the outer side of other positions, such as the left side, the right side, or may be disposed on one side of the battery module 200, and the conductive rod 510 may be disposed inside the groove, which may be set by those skilled in the art according to actual needs. The two sliding assemblies 530 may be disposed at the outer sides of both ends of the battery module 200, or two grooves may be disposed at both ends of the battery module 200, and the two sliding assemblies 530 are disposed in the two grooves. The sliding connection may be achieved by providing a through hole at one side of the sliding assembly 530 such that the slip ring guide 520 is disposed inside the through hole, and slidably connecting the slip ring guide 520 with the sliding assembly 530. The sliding assembly 530 and the slip ring guide 520 may be provided with a slider and a groove, respectively, and the slip ring guide 520 may be slidably connected to the sliding assembly 530 by sliding the slip connection with the groove.
It should be noted that the two sliding assemblies 530 of each battery module 200 are connected to the battery module control unit 300. One end of each sliding assembly 530 adjacent to the slip ring guide 520 may be electrically conductive. In a normal state, the sliding assemblies 530 of the battery modules 200 are connected with the first conductive parts 521 of the sliding assemblies 530 at the same end, and one ends of two adjacent battery modules 200 are connected with one end of the sliding assembly 530, which is close to the slip ring guide 520, and the corresponding first conductive parts 521 through conductive wires to realize series connection. In the damaged state of the power battery, after the two sliding assemblies 530 of the damaged battery module 200 receive the damage signal transmitted from the battery module control unit 300, the two sliding assemblies 530 are respectively slid to the positions connected to the corresponding second conductive parts 522 according to the damage signal. At this time, the two sliding members 530 of the damaged battery module 200 are adjacent to one end of the corresponding slip ring guide 520, the two slip ring guide 520, and the conductive rod 510 is connected and electrically connected to the battery modules 200 at the adjacent ends of the damaged battery module 200 through the conductive wire, and the damaged battery module 200 is short-circuited.
As shown in fig. 4, in one embodiment, each slide assembly 530 includes a slip ring 531, a slip ring plunger 532, a flare line 533, a plunger cavity 535, and a gas generator 534. Wherein, both ends of the battery module 200 are provided with grooves, which form plunger cavities 535; the slip ring plunger 532 is disposed inside the plunger cavity 535 and is slidably connected to the plunger cavity 535; the slip ring 531 is disposed at one end of the slip ring plunger 532 near the slip ring guide 520, the slip ring 531 is provided with a through hole, the slip ring guide 520 passes through the through hole and is slidably connected with the slip ring 531 through the through hole, so that the through hole of the slip ring 531 is connected with the first conductive part 521 or the second conductive part 522 or the insulating part 523; the explosion wire 533 is arranged inside the slip ring plunger 532, penetrates through the slip ring plunger 532, and is connected with the bottoms of the slip ring 531 and the slip ring plunger 532; the gas generator 534 is disposed at an end of the firing line 533 remote from the slip ring 531, and is disposed inside the plunger cavity 535 and outside the slip ring plunger 532.
The gas generator 534 of the damaged battery module 200 is used to receive the damaged signal, and the corresponding gas generator 534 is ignited according to the damaged signal to push the corresponding slip ring plunger 532 to slide, so that the through hole of the corresponding slip ring 531 is electrically connected with the corresponding second conductive part 522, and the conductive rod 510, the slip ring guide 520, the slip ring 531, and the battery modules 200 at the adjacent two ends of the damaged battery module 200 are electrically connected, so that the damaged battery module 200 is short-circuited.
It should be noted that, the end of the slip ring 531 and the explosion wire 533 of each battery module 200 near the slip ring 531 may be electrically conductive, and the other portions may not be electrically conductive. The gas generator 534 is connected to the battery module control unit 300.
The two gas generators 534 of the damaged battery module 200 receive the damage signal transmitted from the battery module control unit 300, and at this time, the damage signal may be a high level signal, after the gas generator 534 receives the high level signal, the corresponding gas generator 534 is ignited, and the gas pressure in the corresponding plunger cavity 535 increases, thereby pushing the corresponding slip ring plunger 532 to slide upwards, and the corresponding slip ring 531 is connected to the corresponding second conductive part 522. The conductive rod 510, the two slip ring guide rods 520, the second conductive parts 522 corresponding to the two slip rings 531, and the corresponding explosion wire 533 near one end of the slip ring 531 are electrically connected with the battery modules 200 at the adjacent ends of the damaged battery module 200 through the two conductive wires, and the damaged battery module 200 is short-circuited.
As shown in fig. 4, in one embodiment, each slide assembly 530 further includes a resilient element 536, the resilient element 536 being disposed inside the plunger cavity 535 and outside the slip ring plunger 532 proximate the gas generator 534; one end of the spring element 536 is connected to the bottom of the slip ring plunger 532 and the other end is connected to the bottom of the plunger cavity 535.
In this embodiment, the elastic element 536 may be a spring. After the gas generator 534 is ignited, the air pressure in the plunger cavity 535 is increased to push the corresponding slip ring plunger 532 to slide, the elastic element 536 is stretched, the elastic element 536 has a restoring force, and a certain pulling action is provided for the slip ring plunger 532, so that the slip ring plunger 532 can be adjusted to slide, the slip speed of the slip ring plunger 532 is prevented from being too fast, and the slip ring 531 is ensured to be in stable contact with the second conductive part 522 of the slip ring guide rod 520.
In one embodiment, as shown in fig. 4, the shorting device 500 further includes a pressure balance chamber 540 and a pressure relief valve 550, the pressure balance chamber 540 is disposed at one side of the plunger chamber 535, and the pressure balance chamber 540 is connected to the plunger chamber 535 through the pressure relief valve 550.
In this embodiment, after the gas generator 534 is ignited, the air pressure in the plunger cavity 535 increases, so as to push the corresponding slip ring plunger 532 to slide upwards, and a certain amount of air can be released to the pressure balance cavity 540 through the pressure release valve 550 to adjust the air pressure in the plunger cavity 535, so as to further ensure that the slip ring 531 is in stable contact with the second conductive part 522 of the slip ring guide 520.
As shown in fig. 4, in one embodiment, the detection unit 400 further includes a solid gel 420, the bottom of the battery module 200 is connected with the battery case 100 (not shown in fig. 4) through the solid gel 420, and the resistance wire 410 is disposed inside the solid gel 420.
In the present embodiment, the bottom of the battery module 200 is fixedly connected with the battery housing 200 through the solid glue 420, so as to avoid damage caused by shaking of the battery module 200 inside the battery housing 100 during the running process of the electric vehicle. The arrangement of the resistance wire 410 inside the solid glue 420 can avoid breakage of the resistance wire 410 in the event of a slight impact.
In a specific embodiment, the self-protection system further comprises a transformer 600, wherein one end of the transformer 600 is connected with the output end of the power battery; the other end of the transformer 600 is connected to the battery module control unit 300.
In this embodiment, after the damaged battery module 200 is shorted, the battery module control unit 300 sends a damage signal to the transformer 600, and after the transformer 600 receives the damage signal, the output voltage of the power battery is adjusted according to the number of the shorted damaged battery modules 200, which also makes the power battery still have stable voltage output in a short time after some of the battery modules 200 are damaged.
As shown in fig. 2, in one embodiment, the self-protection system further includes a conductive cord 700, and the ends of the explosion wire 533 of the adjacent two battery modules 200, which are adjacent to the slip ring 531, are connected by the conductive cord 700.
Example 2
As shown in fig. 2, the embodiment of the invention further discloses an electric automobile power battery, which comprises: a hollow battery case 100, a plurality of battery modules 200 disposed inside the battery case 100 and connected in series, and a self-protection system of an electric vehicle power battery according to an embodiment of the present invention; the self-protection system of the electric vehicle power battery is electrically connected with each battery module 200.
The invention provides a self-protection system of an electric vehicle power battery and the electric vehicle power battery, wherein a plurality of battery modules 200 are connected in series, when the bottom of one or more battery modules 200 is impacted, so that the battery modules 200 are extruded and even pierced to be damaged, a battery module control unit 300 determines the corresponding damaged battery module 200 in the battery modules 200 according to the detection result of a detection unit 400 arranged at the bottom of the battery modules 200 and generates a damage signal, so that the position of the damaged battery module 200 can be accurately positioned. In addition, the battery module control unit 300 transmits the damaged signal to the corresponding short-circuiting device 500 of the damaged battery module 200, and the corresponding short-circuiting device 500 is electrically connected with the battery module 200, which is not damaged, at the adjacent two ends of the corresponding damaged battery module 200 after receiving the damaged signal, so that the extruded battery module 200 can be automatically shorted, but the paths of other battery modules 200 are maintained, and the power battery pack can still output power in a short time, thus not only avoiding thermal runaway of the extruded battery module 200 due to continuous power supply, but also avoiding severe accidents such as vehicle collision caused by sudden power interruption.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a further detailed description of the invention with reference to specific embodiments, and it is not intended to limit the practice of the invention to those descriptions. Various changes in form and detail may be made therein by those skilled in the art, including a few simple inferences or alternatives, without departing from the spirit and scope of the present invention.
Claims (9)
1. The self-protection system of the power battery of the electric automobile comprises a hollow battery shell and a plurality of battery modules which are arranged inside the battery shell and connected in series; the self-protection system is characterized by comprising: the battery module control unit is respectively arranged at the bottom of each battery module and is positioned in the battery shell, and the battery module control unit is respectively arranged at the outside of each battery module; wherein the method comprises the steps of
Each short-circuit device comprises a conducting rod arranged on the outer side of the upper part of each battery module, two slip ring guide rods respectively symmetrically arranged at two ends of each battery module, and two sliding assemblies respectively symmetrically arranged at two ends of each battery module; wherein the method comprises the steps of
One end of each slip ring guide rod is connected with the corresponding conductive rod, and the other end of each slip ring guide rod is connected with the corresponding battery module;
each slip ring guide rod comprises a first conductive part, a second conductive part and an insulating part arranged between the first conductive part and the second conductive part; one end of the second conductive part far away from the first conductive part is connected with the conductive rod, and one end of the first conductive part far away from the second conductive part is connected with the battery module;
the sliding component arranged at the same end of the battery module is in sliding connection with the slip ring guide rod, so that the sliding component is connected with the first conductive part or the second conductive part or the insulating part; wherein the method comprises the steps of
Each sliding component comprises a sliding ring, a sliding ring plunger, a point explosion wire, a plunger cavity and a gas generator;
the slip ring is arranged at one end of the slip ring plunger close to the slip ring guide rod, and the slip ring is provided with a through hole; the slip ring guide rod passes through the through hole and is in sliding connection with the slip ring through the through hole so as to enable the through hole of the slip ring to be connected with the first conductive part or the second conductive part or the insulating part;
the battery module control unit is respectively connected with each detection unit and each short-circuit device; and is also provided with
The battery module control unit determines a corresponding damaged battery module in the battery modules according to the detection result of the detection unit, generates a damaged signal and sends the damaged signal to the corresponding short-circuit device;
the corresponding short-circuiting device is electrically connected with the battery modules at the two adjacent ends of the corresponding damaged battery module according to the received damaged signal so as to short-circuit the corresponding damaged battery module; wherein the method comprises the steps of
The gas generator of the damaged battery module is used for receiving the damaged signal, is ignited according to the gas generator corresponding to the damaged signal, pushes the corresponding slip ring plunger to slide, and enables the through hole of the corresponding slip ring to be connected with the corresponding second conductive part, so that the conductive rod of the damaged battery module, the slip ring guide rod, the slip ring and the battery modules at the two adjacent ends of the damaged battery module are electrically connected, and the damaged battery module is in short circuit.
2. The self-protection system of an electric vehicle power cell of claim 1, wherein each of the detection units comprises a resistance wire and a resistance element; wherein the method comprises the steps of
The resistance wire of each detection unit is paved at the bottom of a corresponding battery module, one end of the resistance wire of each detection unit is connected with the battery module control unit through a corresponding resistance element, and the other end of the resistance wire of each detection unit is also connected with the battery module control unit.
3. The self-protection system of an electric automobile power battery according to claim 2, wherein,
grooves are formed in two ends of the battery module, and the grooves form the plunger cavity;
the slip ring plunger is arranged in the plunger cavity and is in sliding connection with the plunger cavity;
the explosion-point line is arranged inside the slip ring plunger, penetrates through the slip ring plunger and is connected with the bottoms of the slip ring and the slip ring plunger;
the gas generator is arranged at one end of the explosion wire, which is far away from the slip ring, and is arranged in the plunger cavity and outside the slip ring plunger.
4. The self-protection system of an electric vehicle power cell of claim 3, wherein each of said sliding assemblies further comprises an elastic element disposed inside said plunger cavity and located outside said slip ring plunger proximate said gas generator; one end of the elastic element is connected with the bottom of the slip ring plunger, and the other end of the elastic element is connected with the bottom of the plunger cavity.
5. The self-protection system of an electric automobile power battery according to claim 4, wherein the short-circuiting device further comprises a pressure balance chamber and a pressure release valve, the pressure balance chamber is arranged on one side of the plunger chamber, and the pressure balance chamber is connected with the plunger chamber through the pressure release valve.
6. The self-protection system of an electric vehicle power battery according to claim 5, wherein the detection unit further comprises a solid glue, the bottom of the battery module is connected with the battery shell through the solid glue, and the resistance wire is arranged inside the solid glue.
7. The self-protection system of an electric automobile power battery according to claim 6, further comprising a transformer, wherein one end of the transformer is connected with the output end of the power battery; the other end of the transformer is connected with the battery module control unit.
8. The self-protection system of an electric automobile power battery according to claim 3, further comprising an electrically conductive cord through which one end of the explosion wire of two adjacent battery modules close to the slip ring is connected.
9. An electric vehicle power cell, comprising: a battery case having a hollow shape, a plurality of battery modules disposed inside the battery case and connected in series, and the self-protection system of the electric vehicle power battery according to any one of claims 1 to 8; wherein,
the self-protection system of the electric automobile power battery is electrically connected with each battery module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110571632.3A CN115395187B (en) | 2021-05-25 | 2021-05-25 | Self-protection system of electric automobile power battery and electric automobile power battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110571632.3A CN115395187B (en) | 2021-05-25 | 2021-05-25 | Self-protection system of electric automobile power battery and electric automobile power battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115395187A CN115395187A (en) | 2022-11-25 |
| CN115395187B true CN115395187B (en) | 2024-04-02 |
Family
ID=84114069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110571632.3A Active CN115395187B (en) | 2021-05-25 | 2021-05-25 | Self-protection system of electric automobile power battery and electric automobile power battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115395187B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005149951A (en) * | 2003-11-17 | 2005-06-09 | Nissan Motor Co Ltd | Short circuit control element, bipolar battery, battery pack, battery module, and vehicle mounting them |
| JP2009110744A (en) * | 2007-10-29 | 2009-05-21 | Sony Corp | Battery pack and shock detecting method |
| KR20140097803A (en) * | 2013-01-30 | 2014-08-07 | 주식회사 엘지화학 | Battery pack, Power-interrupting module applied for the same and Method for interrupting power of battery |
| CN104541354A (en) * | 2012-06-29 | 2015-04-22 | 海瑞克里兹 | Electrical switch forming a fast actuation circuit breaker |
| JP2016072011A (en) * | 2014-09-29 | 2016-05-09 | 株式会社東芝 | Battery pack |
| WO2017036467A1 (en) * | 2015-09-04 | 2017-03-09 | Peter Lell | Method and bridging unit for selectively short-circuiting a secondary battery |
| CN207509774U (en) * | 2017-11-10 | 2018-06-19 | 浙江大学滨海产业技术研究院 | A kind of composite material power battery pack that there is damage to perceive |
| CN212412120U (en) * | 2020-06-30 | 2021-01-26 | 蜂巢能源科技有限公司 | Power battery thermal runaway early warning system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2722861B8 (en) * | 2012-10-22 | 2016-09-21 | ABB Schweiz AG | Fault current limiter arrangement |
-
2021
- 2021-05-25 CN CN202110571632.3A patent/CN115395187B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005149951A (en) * | 2003-11-17 | 2005-06-09 | Nissan Motor Co Ltd | Short circuit control element, bipolar battery, battery pack, battery module, and vehicle mounting them |
| JP2009110744A (en) * | 2007-10-29 | 2009-05-21 | Sony Corp | Battery pack and shock detecting method |
| CN104541354A (en) * | 2012-06-29 | 2015-04-22 | 海瑞克里兹 | Electrical switch forming a fast actuation circuit breaker |
| KR20140097803A (en) * | 2013-01-30 | 2014-08-07 | 주식회사 엘지화학 | Battery pack, Power-interrupting module applied for the same and Method for interrupting power of battery |
| JP2016072011A (en) * | 2014-09-29 | 2016-05-09 | 株式会社東芝 | Battery pack |
| WO2017036467A1 (en) * | 2015-09-04 | 2017-03-09 | Peter Lell | Method and bridging unit for selectively short-circuiting a secondary battery |
| CN207509774U (en) * | 2017-11-10 | 2018-06-19 | 浙江大学滨海产业技术研究院 | A kind of composite material power battery pack that there is damage to perceive |
| CN212412120U (en) * | 2020-06-30 | 2021-01-26 | 蜂巢能源科技有限公司 | Power battery thermal runaway early warning system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115395187A (en) | 2022-11-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100433446C (en) | Cell evaluation device | |
| CN108711893A (en) | A kind of power battery thermal runaway early warning system and method | |
| CN111301716B (en) | Power supply and distribution system of multistage carrier rocket | |
| DE102012205553A1 (en) | Battery cell for a vehicle with a device for decoupling and / or bridging connections of the battery cell | |
| CN115395187B (en) | Self-protection system of electric automobile power battery and electric automobile power battery | |
| CN113872281B (en) | Battery management system | |
| CN110534822B (en) | Power battery fault early warning system | |
| CN205680725U (en) | A kind of power battery module structure | |
| CN105977555B (en) | A kind of modular battery pack system | |
| CN105375551A (en) | Battery rack for electric vehicle battery pack quick replacement system | |
| CN105871037B (en) | Battery management system and method | |
| CN117065255A (en) | Fire prevention and control system and method for autonomous controllable electrochemical energy storage station | |
| CN107507959A (en) | A kind of design method of pole piece of power battery | |
| CN107727985A (en) | A kind of battery core short-circuit test mechanism and method of testing | |
| CN214542327U (en) | Battery thermal runaway alarm system | |
| CN215680806U (en) | Battery cell, battery pack and vehicle | |
| CN216245878U (en) | Portable detonating instrument detection device | |
| CN108597888B (en) | Super capacitor monitoring system based on CAN bus communication and convenient to overhaul | |
| CN113777508A (en) | Testing device and testing method for storage battery | |
| WO2022105405A1 (en) | Intelligent connecting sheet, battery pack and vehicle | |
| CN210803620U (en) | Device for testing battery management system | |
| CN218916616U (en) | Power battery pressure sensor | |
| CN212461975U (en) | Battery monomer coupling assembling, on-vehicle power battery and vehicle | |
| CN221080272U (en) | Copper bar with active cutting-off function | |
| CN221340211U (en) | Control circuit for electric vehicle and electric vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |