CN216597752U - Battery pack safety heating device for energy storage - Google Patents
Battery pack safety heating device for energy storage Download PDFInfo
- Publication number
- CN216597752U CN216597752U CN202122544461.3U CN202122544461U CN216597752U CN 216597752 U CN216597752 U CN 216597752U CN 202122544461 U CN202122544461 U CN 202122544461U CN 216597752 U CN216597752 U CN 216597752U
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- heating
- energy storage
- switch
- battery pack
- control unit
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 159
- 238000004146 energy storage Methods 0.000 title claims abstract description 60
- 238000007599 discharging Methods 0.000 claims abstract description 40
- 238000004891 communication Methods 0.000 claims abstract description 32
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a safe heating device of a battery pack for energy storage, which comprises an acquisition circuit, a charging and discharging circuit, a heating circuit, an energy storage converter, a communication unit and a control unit, wherein the charging and discharging circuit, the energy storage converter and the battery pack are connected in series to form a loop, and the heating circuit is connected in parallel at two ends of the energy storage converter. The heating circuit comprises a heating switch, a current sensor and a heating film which are connected in series, the current sensor and the heating switch are electrically connected with the control unit, and the current sensor is used for collecting heating current of the heating circuit. The collecting circuit collects the temperature of the battery pack and the voltage of the single battery, only when the voltage of the single battery is within a preset voltage range and the temperature of the battery pack is smaller than or equal to a first temperature threshold value, the control unit conducts the heating switch, power supply electric energy is provided through the energy storage converter, the heating circuit heats the battery pack, and therefore the full-weather application effect of the battery pack of the energy storage system is improved. The utility model has simple structure, easy realization, low energy consumption and low cost.
Description
Technical Field
The utility model relates to the technical field of battery management, in particular to a safe heating device for an energy storage battery pack.
Background
The lithium ion battery has the advantages of high energy density, cyclic charging, safety, environmental protection and the like, and is widely applied to the fields of new energy automobiles, consumer electronics, energy storage systems and the like. However, the use of lithium ion batteries is somewhat limited in low temperature environments. In particular, the discharge capacity of the lithium ion battery in a low temperature environment is severely degraded, and the lithium ion battery cannot be safely charged in the low temperature environment. Therefore, in order to enable normal use of the lithium ion battery, it is necessary to heat the battery pack in a low-temperature environment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a safe heating device of a battery pack for energy storage.
In order to achieve the purpose, the utility model provides a safe heating device for a battery pack for energy storage, which comprises an acquisition circuit, a charging and discharging circuit, a heating circuit, an energy storage converter, a communication unit and a control unit, wherein the charging and discharging circuit, the energy storage converter and the battery pack are connected in series to form a loop. The charging and discharging circuit is electrically connected with the control unit and is controlled by the control unit to be switched on or switched off. The heating circuit is connected in parallel at two ends of the energy storage converter and comprises a heating switch, a current sensor and a heating film which are connected in series, the current sensor and the heating switch are electrically connected with the control unit, and the current sensor is used for collecting heating current of the heating circuit and transmitting the heating current to the control unit. The acquisition circuit is electrically connected with the control unit and is used for acquiring the temperature of the battery pack, the voltage of the single battery and the temperature of the heating film and transmitting the temperature to the control unit. The communication unit is used for connecting the energy storage converter with the control unit in a communication mode, and the energy storage converter outputs power supply electric energy according to the power supply request signal transmitted by the communication unit. The control unit is used for controlling the heating switch to be conducted when the voltage of the single battery is within a preset voltage range and the temperature of the battery pack is smaller than or equal to a first temperature threshold value, and transmitting the power supply request signal to the energy storage converter by means of the communication unit.
In some embodiments, the control unit is configured to control the heating switch to be turned off when the heating film temperature is greater than or equal to a second temperature threshold, or the battery pack temperature is greater than or equal to a third temperature threshold, or the heating current is greater than or equal to a first current threshold.
In some embodiments, the heating circuit further comprises a fuse connected in series with the heating switch, the current sensor, and the heating membrane, the fuse blowing when the heating current reaches a second current threshold.
In some embodiments, the heating circuit further comprises a temperature controlled switch connected in series with the heating switch, the current sensor, the heating film, and the fuse, the temperature controlled switch being closed when the sensed temperature is less than a fourth temperature threshold and being opened when the sensed temperature reaches the fourth temperature threshold.
In some embodiments, the temperature controlled switch is a normally closed type, which automatically closes when the sensed temperature drops to a fifth temperature threshold, which is less than the fourth temperature threshold.
In some embodiments, the current sensor is a single chip hall current sensor.
In some embodiments, the communication unit is a CAN communication unit or an RS485 communication unit.
In some embodiments, the charging and discharging circuit includes a shunt, a discharging switch and a charging switch connected in series, the discharging switch and the charging switch are respectively electrically connected to the control unit, the discharging switch and the charging switch are controlled by the control unit to be turned on or off, and the control unit obtains the charging and discharging current of the charging and discharging circuit based on the shunt.
In some embodiments, the discharge switch, the charge switch and the heating switch are all NMOS transistors.
In some embodiments, the charging and discharging circuit is in a conducting state, the control unit outputs a heating-off signal to control the heating switch to be turned off, and then when the current sensor continuously collects that the heating current is greater than a preset current within a preset time, the control unit transmits a fault signal to the energy storage converter through the communication unit, so that the energy storage converter stops outputting power supply energy, and controls the charging and discharging circuit to be turned off.
Compared with the prior art, the battery pack temperature and the single battery voltage are acquired through the acquisition circuit, the heating switch is switched on only when the single battery voltage is within the preset voltage range and the battery pack temperature is less than or equal to a first temperature threshold, the power supply electric energy is provided through the energy storage converter, the heating circuit heats the battery pack, and therefore the full-weather application effect of the battery pack of the energy storage system is improved. Moreover, the heating circuit is connected in series with a fuse and a temperature control switch, and when the heating current is too large due to short circuit failure of the heating film and the like, the fuse is fused to disconnect the heating circuit; when the temperature is too high, the temperature control switch is switched off, so that the heating safety and reliability of the battery pack are improved. In addition, when the charging and discharging circuit is in a conducting state, the heating current is detected after the heating closing signal is output, if the heating current is abnormal, a fault signal is transmitted to the energy storage converter to enable the energy storage converter to stop outputting power supply electric energy, and the charging and discharging circuit is controlled to be disconnected, so that the heating circuit and the whole heating device are comprehensively protected. The battery pack safety heating device is simple in structure, easy to realize, low in working energy consumption and low in cost.
Drawings
Fig. 1 is a schematic structural diagram of a safety heating device of an energy storage battery pack according to an embodiment of the utility model.
FIG. 2 is a schematic diagram of a heating circuit according to an embodiment of the present invention.
Fig. 3 is a flow chart of the heating process by using the battery pack safety heating device for energy storage of the utility model.
Detailed Description
In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings. It is to be understood that the described embodiments are merely a subset of embodiments of the utility model and not all embodiments of the utility model, with the understanding that the utility model is not limited to the example embodiments described herein. All other embodiments, which can be derived by a person skilled in the art from the described embodiments without inventive effort, shall fall within the scope of protection of the utility model.
Referring to fig. 1 and 2, the present invention provides a safety heating device for an energy storage battery pack. The battery pack 70 is formed by connecting N lithium ion batteries in series. The battery pack safety heating device for energy storage comprises an acquisition circuit 10, a charging and discharging circuit 20, a heating circuit 30, an energy storage converter 40, a communication unit 50 and a control unit 60, wherein the charging and discharging circuit 20, the energy storage converter 40 and a battery pack 70 are connected in series to form a loop. The charging and discharging circuit 20 is electrically connected to the control unit 60, and is controlled by the control unit 60 to be turned on to charge or discharge the battery pack 70, or turned off to stop charging or discharging the battery pack 70. The heating circuit 30 is connected in parallel to two ends of the energy storage converter 40, and includes a heating switch K1, a current sensor U1 and a heating film R1 which are connected in series, and the current sensor U1 and the heating switch K1 are electrically connected with the control unit 60. The current sensor U1 is used to collect the heating current of the heating circuit 30 and transmit the current to the control unit 60. The heating switch K1 is controlled by the control unit 60 to be turned on or off. The collecting circuit 10 is electrically connected to the control unit 60, and is configured to collect the battery pack temperature, the cell voltage, and the heating film temperature, and transmit the battery pack temperature, the cell voltage, and the heating film temperature to the control unit 60. The communication unit 50 is used for connecting the energy storage converter 40 with the control unit 60 in a communication manner, and the energy storage converter 40 outputs power supply energy according to the power supply request signal transmitted by the communication unit 50. The control unit 60 is configured to control the heating switch K1 to be turned on when the cell voltage is within the preset voltage range and the battery pack temperature is less than or equal to the first temperature threshold T1, and transmit a power supply request signal to the energy storage converter 40 through the communication unit 50, so as to heat the battery pack 70 through the heating circuit 30. And when the temperature of the heating film is greater than the second temperature threshold T2, or the temperature of the battery pack is greater than the third temperature threshold T3, or the heating current is greater than the first current threshold C1, controlling the heating switch K1 to be switched off.
Specifically, the current sensor U1 may be an open-loop hall current sensor, and the heating current passes through only the sensing region of the current sensor U1; or a single-chip hall current sensor, for example, a CC6904SO-20A series (rated collection current is 20A), and the heating current flows into the current sensor U1 and then flows out to the heating switch K1. As a preferred embodiment, the current sensor U1 is a single chip hall current sensor, having lower power consumption, lower cost, and smaller volume.
Specifically, the communication unit 50 is a CAN communication unit or an RS485 communication unit. The communication unit 50 is preferably a CAN communication unit.
As shown in fig. 1 and 2, in a preferred embodiment, the heating circuit 30 further includes a fuse F1 connected in series with the heating switch K1, the current sensor U1, and the heating film R1, wherein the fuse F1 is blown when the heating current reaches a second current threshold C2, and the second current threshold C2 is greater than the first current threshold C1. By means of the fuse F1, when the heating current is abnormally excessive after the short circuit failure of the heating film R1, the fuse is safely fused to disconnect the whole heating circuit 30, and the safety protection of the whole heating device is realized.
Further, the heating circuit 30 further includes a temperature controlled switch K4 connected in series with the heating switch K1, the current sensor U1, the heating film R1 and the fuse F1, wherein the temperature controlled switch K4 is closed when the sensed temperature is lower than a fourth temperature threshold T4 and is opened when the sensed temperature reaches a fourth temperature threshold T4. When the temperature control switch K4 is in a closed state, the heating switch K1 is turned on, and the heating circuit 30 is turned on, so that the battery pack 70 can be heated by the heating circuit 30. By arranging the temperature control switch K4, when the temperature is too high, the heating circuit 30 is disconnected, and the safety of the whole heating device is further improved.
Specifically, the temperature controlled switch K4 is of a normally closed type. When the sensed temperature is lower than the fourth temperature threshold T4, the temperature switch K4 is kept in a closed state, and after the sensed temperature reaches the fourth temperature threshold T4 and is opened, the temperature switch K will be automatically closed again if the sensed temperature drops to the fifth temperature threshold T5. The fifth temperature threshold T5 is less than the fourth temperature threshold T4, e.g., 45 ℃ for the fourth temperature threshold T4, 35 ℃ for the fifth temperature threshold T5,
as shown in fig. 1, the charging/discharging circuit 20 includes a shunt R2, a discharging switch K2, and a charging switch K3, which are connected in series, the discharging switch K2 and the charging switch K3 are respectively electrically connected to the control unit 60, and the discharging switch K2 and the charging switch K3 are controlled by the control unit 60 to be turned on or off. The control unit 60 obtains the charge and discharge current of the charge and discharge circuit 20 based on the shunt R2.
In a preferred embodiment, the discharge switch K2 and the charge switch K3 are both NMOS transistors. The heating switch K1 is also an NMOS transistor. Of course, the discharge switch K2, the charge switch K3, and the heat switch K1 may be other switching devices.
As a preferred embodiment, if the battery pack 70 is in a charging or discharging state, after the control unit 60 outputs a heating-off signal to control the heating switch K1 to be turned off, if the current sensor U1 continuously collects a heating current greater than the preset current C2 (e.g., 2A) within a preset time (e.g., 2S), it is determined that a fault such as adhesion of the heating switch K1 occurs, and the control unit 60 outputs a fault signal and transmits the fault signal to the energy storage converter 40 via the communication unit 50, so that the energy storage converter 40 stops outputting the power supply (charging and discharging current). Meanwhile, the control unit 60 outputs control signals to control the discharge switch K2 and the charge switch K3 to be turned off, so that the battery pack 70 enters a safety protection state.
The heating process of the present invention will be described with reference to fig. 3, which is a drawing of an embodiment.
Firstly, the state information (including but not limited to the voltage of the single battery and the temperature of the battery pack) of the battery pack 70 is acquired in real time through the acquisition circuit 10 and is transmitted to the control unit 60; the control unit 60 determines whether the voltage of the single battery falls within a preset voltage range (normal value range), and if so, determines whether heating needs to be started according to the temperature of the battery pack. If the temperature of the battery pack is less than or equal to the first temperature threshold value T1 (e.g., 0 ℃), heating is started. If the voltage of the single battery exceeds the preset voltage range or the temperature of the battery pack is larger than a first temperature threshold value T1, heating is not started. When the pure heating function is started, the control unit 60 outputs control signals EN2 and EN3 to disconnect the discharging switch K2 and the charging switch K3 respectively, and then outputs a control signal EN1 to turn on the heating switch K1, and communicates with the energy storage converter 40 through the communication unit 50 to request a heating current (e.g., 10A). In the heating process, the acquisition circuit 10 inspects the heating film temperature, the battery pack temperature and acquires the heating current through the current sensor U1, and if the heating film temperature is greater than the second temperature threshold T2 (e.g., 70 ℃), or the battery pack temperature is greater than the third temperature threshold T3 (e.g., 30 ℃), or the heating current is greater than the first current threshold C1 (e.g., 15A), the control unit 60 controls the heating switch K1 to be turned off, and the current heating process is ended.
After the discharge switch K2 and the charge switch K3 are turned off, when the control unit 60 receives a charge/discharge request, the discharge switch K2 and the charge switch K3 are turned on, and the battery pack 70 is charged and discharged while the battery pack 70 is heated by the heating circuit 30. After the control unit 60 outputs a heating-off signal to control the heating switch K1 to be turned off, a preset time (e.g., 2 seconds) is delayed to detect whether the heating current is reduced to a preset current (e.g., 0), if not, a fault such as adhesion of the heating switch K1 is considered to occur, the control unit 60 transmits a fault signal to the energy storage converter 40 through the communication unit 50, so that the energy storage converter 40 stops outputting the power supply energy, and meanwhile, the control unit 60 also outputs a control signal to control the discharging switch K2 and the charging switch K3 to be turned off.
In summary, the battery pack temperature and the single battery voltage are collected by the collecting circuit 10, and only when the single battery voltage is within the preset voltage range and the battery pack temperature is less than or equal to the first temperature threshold T1, the heating switch K1 is turned on, and the energy storage converter 40 provides power supply electric energy, so that the heating circuit 30 heats the battery pack 70, thereby improving the full-weather application effect of the battery pack 70 of the energy storage system. A fuse F1 and a temperature-dependent switch K4 are connected in series to the heating circuit 30, and when a heating current is too large due to short-circuit failure of the heating film R1, the fuse F1 fuses and opens the heating circuit 30; when the temperature is too high, the temperature control switch K4 is turned off, so that the heating safety and reliability of the battery pack 70 are improved. In addition, when the charging and discharging circuit 20 is in a conducting state, the utility model also detects the heating current after outputting the heating closing signal, if the heating current is abnormal, the utility model transmits a fault signal to the energy storage converter 40 to enable the energy storage converter 40 to stop outputting the power supply electric energy, and controls the charging and discharging circuit 20 to be switched off, so as to realize the comprehensive protection of the heating circuit 30 and the whole heating device. The safe heating device of the battery pack 70 has the advantages of simple structure, easy realization, low energy consumption and low cost.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. A safe heating device of a battery pack for energy storage is characterized by comprising an acquisition circuit, a charging and discharging circuit, a heating circuit, an energy storage converter, a communication unit and a control unit, wherein the charging and discharging circuit, the energy storage converter and the battery pack are connected in series to form a loop;
the charging and discharging circuit is electrically connected with the control unit and is controlled by the control unit to be switched on or off;
the heating circuit is connected in parallel at two ends of the energy storage converter and comprises a heating switch, a current sensor and a heating film which are connected in series, the current sensor and the heating switch are electrically connected with the control unit, and the current sensor is used for collecting heating current of the heating circuit and transmitting the heating current to the control unit;
the acquisition circuit is electrically connected with the control unit and is used for acquiring the temperature of the battery pack, the voltage of the single battery and the temperature of the heating film and transmitting the temperature to the control unit;
the communication unit is used for connecting the energy storage converter with the control unit in a communication mode, and the energy storage converter outputs power supply electric energy according to a power supply request signal transmitted by the communication unit;
the control unit is used for controlling the heating switch to be conducted when the voltage of the single battery is within a preset voltage range and the temperature of the battery pack is smaller than or equal to a first temperature threshold value, and transmitting the power supply request signal to the energy storage converter by means of the communication unit.
2. The safe heating device for the energy storage battery pack as claimed in claim 1, wherein the control unit is used for controlling the heating switch to be switched off when the temperature of the heating film is greater than or equal to a second temperature threshold value, or the temperature of the battery pack is greater than or equal to a third temperature threshold value, or the heating current is greater than or equal to a first current threshold value.
3. The battery pack safety heating device for energy storage according to claim 1 or 2, wherein the heating circuit further comprises a fuse connected in series with the heating switch, the current sensor and the heating film, the fuse being blown when the heating current reaches a second current threshold value.
4. The safe heating device for energy storage battery pack according to claim 3, wherein the heating circuit further comprises a temperature controlled switch connected in series with the heating switch, the current sensor, the heating film, and the fuse, wherein the temperature controlled switch is closed when the sensed temperature is less than a fourth temperature threshold and is opened when the sensed temperature reaches the fourth temperature threshold.
5. The device as claimed in claim 4, wherein the thermostat is a normally closed type which automatically closes when the sensed temperature drops to a fifth temperature threshold, the fifth temperature threshold being less than the fourth temperature threshold.
6. The safe heating device for battery pack used for energy storage according to claim 1 or 2, characterized in that the current sensor is a single chip Hall current sensor.
7. The battery pack safety heating device for energy storage according to claim 1 or 2, wherein the communication unit is a CAN communication unit or an RS485 communication unit.
8. The battery pack safety heating device for energy storage according to claim 1 or 2, characterized in that the charging and discharging circuit comprises a shunt, a discharging switch and a charging switch which are connected in series, the discharging switch and the charging switch are respectively electrically connected with the control unit, the discharging switch and the charging switch are controlled by the control unit to be switched on or off, and the control unit obtains the charging and discharging current of the charging and discharging circuit based on the shunt.
9. The safe heating device for energy storage battery pack according to claim 8, wherein the discharge switch, the charge switch and the heating switch are NMOS transistors.
10. The battery pack safety heating device for energy storage according to claim 1 or 2, wherein the charging and discharging circuit is in a conducting state, the control unit outputs a heating-off signal to control the heating switch to be turned off, and then when the current sensor continuously collects the heating current greater than a preset current within a preset time, the control unit transmits a fault signal to the energy storage converter via the communication unit, so that the energy storage converter stops outputting power supply energy and controls the charging and discharging circuit to be turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122544461.3U CN216597752U (en) | 2021-10-21 | 2021-10-21 | Battery pack safety heating device for energy storage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122544461.3U CN216597752U (en) | 2021-10-21 | 2021-10-21 | Battery pack safety heating device for energy storage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216597752U true CN216597752U (en) | 2022-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122544461.3U Expired - Fee Related CN216597752U (en) | 2021-10-21 | 2021-10-21 | Battery pack safety heating device for energy storage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216597752U (en) |
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2021
- 2021-10-21 CN CN202122544461.3U patent/CN216597752U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220524 |
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| CF01 | Termination of patent right due to non-payment of annual fee |