CN220114493U - Lithium battery low-temperature rapid heating device - Google Patents
Lithium battery low-temperature rapid heating device Download PDFInfo
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- CN220114493U CN220114493U CN202321660659.0U CN202321660659U CN220114493U CN 220114493 U CN220114493 U CN 220114493U CN 202321660659 U CN202321660659 U CN 202321660659U CN 220114493 U CN220114493 U CN 220114493U
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- lithium battery
- battery pack
- inductor
- temperature
- circuit
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 94
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 238000010438 heat treatment Methods 0.000 title claims abstract description 47
- 238000007599 discharging Methods 0.000 claims abstract description 28
- 230000001939 inductive effect Effects 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 16
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004146 energy storage Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 150000002641 lithium Chemical class 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model discloses a low-temperature rapid heating device for a lithium battery, and belongs to the technical field of energy storage. The lithium battery heating device aims at solving the problems that in the prior art, the structure of a lithium battery heating technology is complex, and energy of the lithium battery can be used for heating, so that the energy consumption of the lithium battery is increased. The lithium battery pack heating device is connected in parallel with two ends of the lithium battery pack; the discharging circuit is an inductive discharging circuit and comprises an inductor and a switching device, wherein the inductor is connected with the switching device in series and then connected with two ends of the lithium battery pack; the switching device is conducted when the discharging circuit discharges; the freewheeling circuit is a diode freewheeling circuit and is connected in series with the inductor; when the discharge circuit is disconnected, current in the inductor flows through the freewheeling circuit and the lithium battery pack. According to the scheme, the available energy of the lithium battery pack is protected in the low-temperature state of the lithium battery pack, and the lithium battery can be heated to reach the target temperature with the consumption as small as possible.
Description
Technical Field
The utility model relates to a low-temperature rapid heating device for a lithium battery, and belongs to the technical field of positioning.
Background
The lithium ion battery is the first choice of the power battery of the electric automobile due to the advantages of high energy density, long service life, energy conservation, environmental protection and the like. However, due to the variation of parameters with conditions, lithium ion batteries still have some challenges in practical applications. The available capacity of the lithium ion battery in a low-temperature environment is rapidly reduced, the endurance mileage of the electric automobile can be directly influenced, the battery is more difficult to charge, the output power is greatly reduced, and the normal working condition requirement is difficult to reach when serious. In the prior art, a heating technology of a part of lithium battery packs is presented to ensure the working temperature of the lithium battery packs. However, the conventional heating method generally adopts an external heating device to heat the lithium battery pack, so that the structure is complex, the energy of the lithium battery can be used for heating, and the energy consumption of the lithium battery is increased.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model provides a low-temperature rapid heating device for a lithium battery, which can protect the available energy of the lithium battery in a low-temperature state of the lithium battery, and can heat the lithium battery to reach the target temperature with the consumption as small as possible.
In order to solve the technical problems, the utility model adopts the technical scheme that the low-temperature rapid heating device of the lithium battery comprises a lithium battery pack and a lithium battery pack heating device, wherein the lithium battery pack heating device is connected in parallel with two ends of the lithium battery pack, and the lithium battery pack heating device comprises
The discharging circuit is an inductive discharging circuit and comprises an inductor and a switching device, wherein the inductor is connected with the switching device in series and then connected with two ends of the lithium battery pack; the switching device is conducted when the discharging circuit discharges;
the freewheeling circuit is a diode freewheeling circuit and is connected in series with the inductor; when the discharge circuit is disconnected, current in the inductor flows through the freewheeling circuit and the lithium battery pack.
Preferably, the discharging circuit comprises an inductor and two switching devices, wherein the two switching devices are respectively connected in series at two ends of the inductor and then connected with the lithium battery pack in parallel; when the discharging circuit discharges, both switching devices are conducted.
Preferably, in the lithium battery low-temperature rapid heating device, two switching devices of the discharging circuit are a first switch and a second switch respectively.
Optimally, in the lithium battery low-temperature rapid heating device, the first switch and the second switch of the discharging circuit are MOS tubes respectively; when the discharging circuit discharges, the first switch and the second switch of the MOS tube type are in a conducting state.
Optimally, the low-temperature rapid heating device of the lithium battery comprises a follow current circuit which comprises a first diode and a second diode; the first diode and the second diode are respectively connected in series with two ends of the inductor and then connected in parallel with the lithium battery pack; when the switching device of the discharge circuit is turned off, the current in the inductor freewheels through the first and second diodes and the lithium battery pack.
Preferably, the lithium battery low-temperature rapid heating device further comprises a temperature detection circuit, wherein the temperature detection circuit comprises a temperature sensor, and the temperature sensor is arranged on the lithium battery pack.
Preferably, in the lithium battery low-temperature rapid heating device, the first switch and the second switch of the two switch devices are temperature control switches, and the temperature sensor of the temperature detection circuit is a temperature detection end of the first switch and a temperature detection end of the second switch.
The lithium battery low-temperature rapid heating method based on the lithium battery low-temperature rapid heating device comprises the following steps:
1) Starting the two switching devices to conduct the two switching devices, and discharging the inductor by the lithium battery pack;
2) Switching off the two switching devices, and allowing current in the inductor to flow back to the lithium battery pack through the first diode and the second diode, wherein the lithium battery pack heats;
3) And monitoring temperature, voltage and current information of the battery in real time.
In step 1), when the lithium battery pack discharges the inductor, the discharge current is controlled to reach a set current value.
When the first switch and the second switch of the two switch devices are temperature control switches, the temperature detection ends of the first switch and the second switch detect the temperature of the lithium battery pack, and the first switch and the second switch are turned on and off under the control of the temperature of the lithium battery pack.
The beneficial effects of the utility model are as follows:
in the heating process, the energy released by the lithium battery pack returns to the lithium battery pack through the energy storage follow current of the inductor, and the battery can generate heat due to the internal resistance of the battery of the lithium battery pack, so that the consumed electric energy is completely converted into the heat energy of the lithium battery pack, and the energy consumption is effectively saved.
According to the technical scheme, the electric heating device is balanced in heating, and compared with external heating, each electric core can be more uniform, temperature rise is not uniform, and the temperature difference is smaller.
According to the technical scheme, the battery cells with different temperatures reach the same temperature faster, the battery cells with lower temperatures have larger internal resistance and generate more heat, so that the battery cells with lower temperatures have quicker temperature rise and the same temperature can be achieved quickly.
Drawings
Fig. 1 is a schematic structural view of a heating device for lithium battery packs according to embodiments 1 and 2 of the present utility model;
FIG. 2 is a current diagram of the system when a lithium battery pack is heated;
fig. 3 is a schematic structural view of a heating device for a lithium battery pack according to embodiment 3 of the present utility model.
Detailed Description
The technical features of the present utility model are further described below in conjunction with specific embodiments.
Example 1
The utility model relates to a lithium battery low-temperature rapid heating device, which comprises a lithium battery pack and a lithium battery pack heating device, wherein the lithium battery pack heating device is connected in parallel with two ends of the lithium battery pack, and the lithium battery pack heating device comprises
The discharging circuit is an inductive discharging circuit and comprises an inductor L and a switching device, wherein the inductor L is connected with the two ends of the lithium battery pack after being connected in series with the switching device; the switching device is conducted when the discharging circuit discharges;
the freewheeling circuit is a diode freewheeling circuit and is connected in series with the inductor L; when the discharge circuit is turned off, the current in the inductor L freewheels through the freewheel circuit and the lithium battery pack.
The discharging circuit comprises an inductor L and two switching devices, wherein the two switching devices are respectively connected in series at two ends of the inductor L and then connected with the lithium battery pack in parallel; when the discharging circuit discharges, both switching devices are conducted.
The two switching devices of the discharging circuit are a switch I S1 and a switch II S2 respectively. The freewheel circuit comprises a diode one D1 and a diode two D2; the diode I D1 and the diode II D2 are respectively connected in series at two ends of the inductor L and then connected in parallel with the lithium battery pack; when the switching device of the discharge circuit is turned off, the current in the inductance L freewheels through the diode one D1 and the diode two D2 and the lithium battery pack.
The current detection circuit is a resistor with extremely small resistance, when current flows, voltage difference is generated at two ends of the resistor, and the current is calculated by measuring the voltage difference.
The low-temperature rapid heating method for the lithium battery based on the low-temperature rapid heating device for the lithium battery comprises the following steps of:
1) Opening the first switch S1 and the second switch S2, and discharging the inductor L by the lithium battery pack; in the process, the discharge current needs to be controlled to reach the set current value;
2) The switch I S1 and the switch II S2 are disconnected, current in the inductor L flows back to the battery through the diode I D1 and the diode II D2, and therefore the battery core can generate heat due to the fact that the internal resistance of the battery core is large and the direction of the current is changed under the low temperature condition, and the purpose of heating is achieved.
And the current with the direction changed avoids the phenomenon of lithium precipitation when the current is large in one direction.
3) And monitoring temperature, voltage and current information of the battery in real time.
Example 2
This embodiment differs from embodiment 1 in that: the two switching devices of the discharging circuit are a switch I S1 and a switch II S2 which are MOS tubes; when the discharging circuit discharges, the first switch S1 and the second switch S2 of the MOS tube type are in a conducting state.
Example 3
This embodiment differs from embodiments 1, 2 in that: the lithium battery low-temperature rapid heating device further comprises a temperature detection circuit, wherein the temperature detection circuit comprises a temperature sensor, and the temperature sensor is arranged on the lithium battery pack. The two switching devices, namely the switch I S1 and the switch II S2, are temperature control switches, and the temperature sensors of the temperature detection circuit are temperature detection ends of the switch I S1 and the switch II S2.
When the two switching devices are temperature control switches, the temperature detection ends of the first switch S1 and the second switch S2 detect the temperature of the lithium battery pack, and the temperature of the lithium battery pack controls the on and off of the first switch S1 and the second switch S2.
It should be understood that the above description is not intended to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the particular embodiments disclosed, and that various changes, modifications, additions and substitutions can be made by those skilled in the art without departing from the spirit and scope of the utility model.
Claims (7)
1. The utility model provides a quick heating device of lithium cell low temperature, includes lithium cell group and lithium cell group heating device, and lithium cell group heating device connects in parallel in the both ends of lithium cell group, its characterized in that: the lithium battery pack heating device comprises
The discharging circuit is an inductive discharging circuit and comprises an inductor (L) and a switching device, wherein the inductor (L) is connected with the two ends of the lithium battery pack after being connected in series with the switching device; the switching device is conducted when the discharging circuit discharges;
the freewheeling circuit is a diode freewheeling circuit and is connected in series with the inductor (L); when the discharge circuit is opened, current in the inductor (L) flows through the freewheeling circuit and the lithium battery pack.
2. The lithium battery low-temperature rapid heating device according to claim 1, wherein: the discharging circuit comprises an inductor (L) and two switching devices, wherein the two switching devices are respectively connected in series with two ends of the inductor (L) and then connected with the lithium battery pack in parallel; when the discharging circuit discharges, both switching devices are conducted.
3. The lithium battery low-temperature rapid heating device according to claim 2, wherein: the two switching devices of the discharging circuit are a first switch (S1) and a second switch (S2) respectively.
4. A lithium battery low temperature rapid heating apparatus according to claim 3, wherein: the two switches I (S1) and II (S2) of the discharging circuit are MOS tubes respectively; when the discharge circuit discharges, the first switch (S1) and the second switch (S2) of the MOS tube type are in a conducting state.
5. The lithium battery low-temperature rapid heating device according to claim 1, wherein: the freewheel circuit comprises a diode one (D1) and a diode two (D2); the diode I (D1) and the diode II (D2) are respectively connected in series with two ends of the inductor (L) and then connected in parallel with the lithium battery pack; when the switching device of the discharge circuit is turned off, the current in the inductor (L) freewheels through the diode one (D1) and the diode two (D2) and the lithium battery pack.
6. A lithium battery low temperature rapid heating apparatus according to claim 3, wherein: the lithium battery pack also comprises a temperature detection circuit, wherein the temperature detection circuit comprises a temperature sensor, and the temperature sensor is arranged on the lithium battery pack.
7. The lithium battery low-temperature rapid heating device according to claim 6, wherein: the two switching devices, namely a first switch (S1) and a second switch (S2), are temperature control switches, and the temperature sensors of the temperature detection circuit are temperature detection ends of the first switch (S1) and the second switch (S2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321660659.0U CN220114493U (en) | 2023-06-28 | 2023-06-28 | Lithium battery low-temperature rapid heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321660659.0U CN220114493U (en) | 2023-06-28 | 2023-06-28 | Lithium battery low-temperature rapid heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220114493U true CN220114493U (en) | 2023-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321660659.0U Active CN220114493U (en) | 2023-06-28 | 2023-06-28 | Lithium battery low-temperature rapid heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220114493U (en) |
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2023
- 2023-06-28 CN CN202321660659.0U patent/CN220114493U/en active Active
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