CN109755676B - Balancing and heating integrated system of storage battery - Google Patents
Balancing and heating integrated system of storage battery Download PDFInfo
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- CN109755676B CN109755676B CN201910171495.7A CN201910171495A CN109755676B CN 109755676 B CN109755676 B CN 109755676B CN 201910171495 A CN201910171495 A CN 201910171495A CN 109755676 B CN109755676 B CN 109755676B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 93
- 230000000694 effects Effects 0.000 claims description 12
- 230000006698 induction Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a storage battery equalization and heating integrated system, which comprises a power supply, a heat integrated circuit and a temperature sensing device, wherein the power supply is connected with the heat integrated circuit; the power supply comprises a power supply B provided by a storage battery and an external battery charging power supply; the heat integrated circuit comprises an equalization module and a heating module; the equalization module comprises a parallel loop of each module power supply B of the storage battery and a parallel loop of the heating film R, and the two parallel loops are connected through a series circuit; each battery module correspondingly provides a power supply B, and each independent loop in the parallel circuit of the power supply B is connected with a switch k; each independent loop in the parallel circuit of the heating film R is connected with a switch S; the external charging power supply and each heating film R form an integral series circuit to form a heating module of the heat integrated circuit; the positive electrode of the external charging power supply is provided with a switch k+, and the negative electrode is provided with a switch k-. The invention integrates and shares the balance system and the heating system of the battery system into a set of system, and has simple structure and high economic and practical values.
Description
Technical Field
The invention relates to the technical field of battery devices, in particular to a balance and heating integrated system of a storage battery.
Background
The equalization of the battery means that in the use process of the battery, the voltage of the battery terminal is unbalanced due to the individual difference, the temperature difference and the like of the battery, and in order to avoid the deterioration of the unbalanced trend, the voltage consistency of the battery needs to be adjusted by a mode of passive equalization peak clipping or active equalization valley clipping. In the prior art, the equalization function of the battery management system is to independently add an equalization resistor to discharge, and the equalization function is limited by the power consumption of the equalization resistor, and the passively equalized current is only in industry level of hundreds of mA, so that the equalization effect is poor; in addition, a commonly used secondary battery system (such as a lithium battery system) cannot be directly charged at a temperature below 0 ℃ or below, and needs to be heated to a temperature above 0 ℃ by a heating system before charging starts, so that the secondary battery system is mostly a battery system with only the heating system in the market. In the battery system, the heat dissipation conditions of different positions of the battery system are different, so that the battery temperature imbalance condition exists in the charging and discharging process, and the temperature difference cannot be actively adjusted. For the battery system with only the heating system, the conventional common heating scheme can only perform overall system heating, and the problem of large temperature difference between batteries after the whole heating is finished cannot be effectively solved no matter how the power design of heating in different areas is optimized due to different heat dissipation conditions of different positions of the battery system and the complexity of temperature difference conditions of initial heating.
Disclosure of Invention
Aiming at the problems that in the prior art, a balancing system is required to be independently added for a battery balancing function, the balancing effect is poor, and the battery system is unevenly heated, the invention provides the heat integration system of the storage battery, which has the advantages of simple structure, low-temperature heating satisfying of the uniformity of the battery temperature, effective utilization of the energy during battery balancing, effective utilization of the original heating system and high multiplexing rate. The invention comprises the following steps:
an integrated system for balancing and heating storage batteries comprises a power supply, a heat integrated circuit and a temperature sensing device; the power supply comprises a power supply B provided by a storage battery and an external battery charging power supply; the heat integrated circuit comprises an equalization module and a heating module; the equalization module comprises a parallel loop of a power supply B of each module of the storage battery and a parallel loop of a heating film R, and the two parallel loops are connected through a series circuit; each battery module of the storage battery correspondingly provides a power supply B, and each independent loop in the parallel circuit of the power supply B is connected with a switch k; each independent loop in the parallel circuit of the heating film R is connected with a switch S; the external battery charging power supply and each heating film R form an integral series circuit or parallel circuit to form a heating module of the heat integrated circuit; the positive electrode of the external charging power supply is provided with a switch k+, and the negative electrode is provided with a switch k-;
the starting mode of the equalization module is as follows: the switches k+ and k-are disconnected, the switches k and S are simultaneously closed, and the connected battery is provided with a power supply B to start each parallel heating film R so as to achieve the effect of balancing the battery voltage;
the heating module is started in the following way: all switches k are disconnected, corresponding S is judged to be closed or disconnected according to the temperature difference induction of the battery, and meanwhile, the switches k+ and k-are closed, and the serial heating films R are started by the external charging power supply of the battery to achieve the heating effect of the battery;
the temperature sensing device senses the difference temperature among the modules of the battery and controls the opening or closing of each independent loop switch k and S through each temperature difference.
Further, the storage battery is a storage battery module.
Further, the heating film is a resistance heating wire or a PTC heater.
The invention uses the switch matrix design to share the heating film of the battery system heating system with the balance system of the battery system, thereby achieving the following effects: 1. the equalization system and the heating system of the battery system are integrated and shared into a set of system: by utilizing the high-power characteristic of the heating film, a huge balance system is not required to be additionally added, the limit that the passive balance current of the conventional battery system is only in mA level is broken through, and the level of several amperes or even tens of amperes can be reached.
2. The battery system is subjected to temperature compensation by utilizing the energy which is passively balanced and dissipated, so that the temperature difference is reduced: according to the invention, when the batteries are balanced, according to the temperature difference condition of the battery system, the heating films corresponding to the battery modules with lower temperature in the system are selected for discharge balance, and the temperature difference is reduced by temperature compensation, so that the working state of the heating films of each module can be actively controlled, and excessive devices are not additionally added. The requirement of the temperature uniformity of the battery is met, and the energy of the battery during balancing is effectively utilized.
3. The heating system realizes local heating control, and effectively reduces temperature difference: the heating process before low-temperature charging can control the heating system to locally heat according to the temperature difference of the battery system, so that the temperature difference of the low-temperature heating of the battery system is effectively controlled.
Drawings
Fig. 1 is a schematic circuit diagram of the system of the present invention.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical solutions of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, an integrated equalization and heating system for a storage battery comprises a power supply, a heat integrated circuit and a temperature sensing device (not shown in the figure); the power supply comprises a power supply B provided by a storage battery and an external battery charging power supply (namely a charging positive electrode and a charging negative electrode in the figure); the heat integrated circuit comprises an equalization module and a heating module; the equalization module comprises a parallel loop of a power supply B of each module of the storage battery and a parallel loop of a heating film R, and the two parallel loops are connected through a series circuit; each battery module of the storage battery correspondingly provides a power supply B, and each independent loop in the parallel circuit of the power supply B is connected with a switch k; each independent loop in the parallel circuit of the heating film R is connected with a switch S; the external battery charging power supply and each heating film R form an integral series circuit or parallel circuit to form a heating module of the heat integrated circuit; the positive electrode of the external charging power supply is provided with a switch k+, and the negative electrode is provided with a switch k-; the temperature sensing device senses the differential temperature between the modules of the battery and controls the opening or closing of the independent loop switches k and S through the differential temperature, such as a conventional Battery Management System (BMS).
The starting mode of the equalization module is as follows: the switches k+ and k-are disconnected, the switches k and S are simultaneously closed, and the connected battery starts each parallel heating film R from the power supply B to achieve the effect of balancing the battery voltage.
In fig. 1, B represents a battery, K and s represent switches, in actual use, the number of switches is set according to the number of actual battery modules, for example, in fig. 1, the number of battery modules is B1 to B (N), K is K1 to K (n+1), s is s1 to s (n+1), the switching mode is selected according to the voltage level of the battery system (for example, MOS transistors), and k+ and K-can share an electromagnetic relay of a conventional charging circuit. The heating films are represented by the resistor R, each battery module generally corresponds to a group of heating films to heat when the heating system is designed, the battery modules are in one-to-one correspondence with the resistor, and the number of the resistors R is set according to the number of the battery modules B as shown in the figure, namely R1 to R (N) as shown in the figure; the equalization design adopts an independent loop design, is separated from a battery voltage acquisition loop, and adopts a communication mode to exchange information. When the battery is charged, a charging loop is formed by closing K+, K-, K1 and K (n+1) for charging.
When the balance control module judges that the voltage difference of the battery reaches the trigger balance condition during balance control, the battery needing to be subjected to passive balance forms a discharge loop through controlling the switches K, K+ and K-, and the power of the heating film resistor is designed according to the heating effect of the battery system, the voltage and the power are designed according to different battery types, the general power reaches tens of watts, and the current reaches several amperes. For example, the heating film is designed to have a rated voltage of 4.2V and a power of 20W, and the rated current is 4.76A, which is far greater than the conventional equalizing current of 100 mA. By controlling the opening time of the equalization switch, the obvious equalization effect is achieved. The switch matrix portion utilizes the charging and heating loops of a conventional battery system.
The heating module is started in the following way: all switches k are disconnected, corresponding S is judged to be closed or disconnected according to the temperature difference induction of the battery, and meanwhile, the switches k+ and k-are closed, and the serial heating films R are started by the external charging power supply of the battery to achieve the heating effect of the battery;
the passive balancing process can start the heating film switch S of the corresponding module to discharge and heat the heating film of the corresponding module by judging which battery has lower temperature and needs to be subjected to temperature compensation.
In the low-temperature charging and heating process, if the heating resistors are in a parallel connection mode, the formed parallel connection heating system can be used for integrally heating the battery system by closing K+ and K-and all S switches; if the heating resistors are connected in series, the formed series heating system can be used for integrally heating the battery system by closing K+, K-, the switches S1 and S (N+1).
At the low-temperature charging heating tail end, the module which needs to be continuously heated controls the corresponding switch to be closed by judging the temperature difference of the battery, and other heating film switches are opened. And after the temperature difference reaches the requirement, all heating loops are disconnected, and heating is stopped.
Further, the storage battery is a storage battery module.
Further, the heating film is a resistance heating wire or a PTC heater.
The battery equalization needs to additionally add a huge equalization system, but the battery can have the condition of inconsistent terminal voltage, if the battery is not allowed to perform equalization charging, the consistency of the terminal voltage of the battery is ensured, and the consistency of the battery voltage is generally ensured from the raw materials and the production links of the battery, such as the selection of battery materials, in particular the selection of key materials such as electrolyte, polar plates, pressure control valves and the like. Secondly, the quality of battery installation is ensured, and the consistency of battery installation states, such as a battery connection method, torsion balance and the like, is ensured. The invention integrates and shares the balancing system and the heating system of the battery system into a set of system, actively controls the working state of the heating film of each module, does not additionally increase too many devices, subtracts extra huge balancing devices, enlarges balancing current, enhances balancing effect, and simultaneously achieves the purpose of utilizing the energy which is originally passively balanced and not dissipated. And the problem that the temperature difference between the battery modules is large in the heating process before low-temperature charging in the existing scheme is solved through the control function of local heating.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (3)
1. An integrated system for equalization and heating of a storage battery is characterized in that: comprises a power supply, a heat integrated circuit and a temperature sensing device; the power supply comprises a power supply B provided by a storage battery and an external battery charging power supply; the heat integrated circuit comprises an equalization module and a heating module; the equalization module comprises a parallel loop of a power supply B of each module of the storage battery and a parallel loop of a heating film R, and the two parallel loops are connected through a series circuit; each battery module of the storage battery correspondingly provides a power supply B, and each independent loop in the parallel circuit of the power supply B is connected with a switch k; each independent loop in the parallel circuit of the heating film R is connected with a switch S; the external battery charging power supply and each heating film R form an integral series circuit or parallel circuit to form a heating module of the heat integrated circuit; the positive electrode of the external charging power supply is provided with a switch k+, and the negative electrode is provided with a switch k-;
the starting mode of the equalization module is as follows: the switches k+ and k-are disconnected, the switches k and S are simultaneously closed, and the connected battery is provided with a power supply B to start each parallel heating film R so as to achieve the effect of balancing the battery voltage;
the heating module is started in the following way: all switches k are disconnected, corresponding S is judged to be closed or disconnected according to the temperature difference induction of the battery, and meanwhile, the switches k+ and k-are closed, and the serial heating films R are started by the external charging power supply of the battery to achieve the heating effect of the battery;
the temperature sensing device senses the difference temperature among the modules of the battery and controls the opening or closing of each independent loop switch k and S through each temperature difference.
2. The integrated equalization and heating system of a battery of claim 1, wherein: the storage battery is a storage battery module.
3. The integrated equalization and heating system of a battery of claim 1, wherein: the heating film is a resistance heating wire or a PTC heater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910171495.7A CN109755676B (en) | 2019-03-07 | 2019-03-07 | Balancing and heating integrated system of storage battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910171495.7A CN109755676B (en) | 2019-03-07 | 2019-03-07 | Balancing and heating integrated system of storage battery |
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| CN109755676B true CN109755676B (en) | 2024-04-12 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11502350B2 (en) * | 2020-07-20 | 2022-11-15 | Guangzhou Automobile Group Co., Ltd. | Battery heating system, battery device and electric vehicle |
| KR102663022B1 (en) * | 2021-03-26 | 2024-05-07 | 삼성에스디아이 주식회사 | Battery system and Method of controlling the same |
| CN113859032A (en) * | 2021-08-23 | 2021-12-31 | 上海融和智电新能源有限公司 | Novel replaceable battery system |
| CN114844161A (en) * | 2022-05-18 | 2022-08-02 | 北京劢亚科技有限公司 | Battery equalization device and method applied to satellite |
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2019
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| EP2416468A2 (en) * | 2010-08-05 | 2012-02-08 | E4V | Method for balancing a battery and battery management system implementing such a method |
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