CN211790838U - Battery system with cooling equalization function - Google Patents
Battery system with cooling equalization function Download PDFInfo
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- CN211790838U CN211790838U CN202020365479.XU CN202020365479U CN211790838U CN 211790838 U CN211790838 U CN 211790838U CN 202020365479 U CN202020365479 U CN 202020365479U CN 211790838 U CN211790838 U CN 211790838U
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- battery pack
- refrigerating sheet
- sheet set
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- cooling
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Abstract
The utility model belongs to the technical field of batteries, in particular to a battery system with a cooling equalization function, which comprises a battery pack and a cooling equalization system, wherein the battery pack is externally provided with a shell, the shell is internally provided with a signal acquisition unit and a control unit, and the signal acquisition unit is connected with the battery pack and is used for acquiring the temperature and voltage information of the battery pack; the cooling equalization system comprises a refrigerating sheet set, and a power supply end of the refrigerating sheet set is connected with a battery pack or an external power supply end; the control unit controls the external power supply to output electric energy to the refrigerating sheet set for refrigeration, or the control unit controls the battery pack to output electric energy to the refrigerating sheet set to realize battery pack balance, and meanwhile, the refrigerating sheet set realizes refrigeration by utilizing the balanced electric energy output by the battery pack. By adopting the technical scheme, the signal acquisition unit and the control unit are used for controlling the refrigerating sheet set to operate, so that the battery pack has quick balanced repair capability while charging, and the internal temperature rise caused by charging can be reduced.
Description
Technical Field
The utility model belongs to the technical field of the battery, a battery system with balanced function of cooling is related to.
Background
In the charge-discharge cycle process of a plurality of strings of battery packs, imbalance among lithium batteries can be caused after the battery packs are used for a period of time due to characteristic difference among single lithium batteries connected in series, and the overall performance of the plurality of strings of battery packs can be reduced and the service life of the plurality of strings of battery packs can be shortened after the battery packs are used for a long time. Therefore, it is necessary to equalize the voltages of the plurality of strings of battery packs. Meanwhile, in the charging and discharging processes of the battery pack, the temperature is a key factor influencing the service life of the lithium battery. In the passive equalizing charge stage of the currently known lithium battery, the adopted equalizing load converts redundant electric energy into heat energy. The higher the equalization capability, the more heat is generated during equalization, which causes the equalization capability and temperature of the battery pack to be a spear. The traditional equalization mode with lower temperature has weak equalization capability. The temperature is higher in a new mode with higher balance capacity, and the cost is greatly increased by adopting the existing mode for cooling; if not, produce great influence to battery life, increase group battery potential safety hazard simultaneously.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a battery system with balanced function of cooling down realizes better balanced effect, can cool down for the group battery at balanced in-process simultaneously.
In order to achieve the above object, the basic scheme of the utility model is: a battery system with a cooling equalization function comprises a battery pack and a cooling equalization system, wherein a shell is arranged outside the battery pack, a signal acquisition unit and a control unit are arranged in the shell, the signal acquisition unit is connected with the battery pack and used for at least acquiring temperature information and voltage information of the battery pack, and a signal output end of the signal acquisition unit is connected with a corresponding information input end of the control unit;
the cooling equalization system comprises a refrigerating sheet set arranged on the shell, a power supply end of the refrigerating sheet set is connected with the battery pack or an external power supply end through a power switch device, and the power switch device is connected with a control signal output end of the control unit;
the control unit controls the external power supply to output electric energy to the refrigerating sheet set for refrigeration, or the control unit controls the battery pack to output electric energy to the refrigerating sheet set to realize battery pack balance, and meanwhile, the refrigerating sheet set realizes refrigeration by using the electric energy output by the battery pack.
The working principle and the beneficial effects of the basic scheme are as follows: the signal acquisition unit acquires temperature and voltage information of the battery pack, then transmits the acquired information to the control unit, the control unit judges whether the battery pack needs to be cooled according to information feedback, if the battery pack needs to be cooled, a control signal is output to the power switch device, the refrigerating sheet assembly is connected with the power supply, and therefore the refrigerating sheet assembly is started to refrigerate. The refrigerating sheet set can receive power supply of the battery pack or an external power supply end, when the battery pack does not need to be balanced, the external power supply can provide electric energy for the refrigerating sheet set, and the refrigerating sheet set can be smoothly started to operate when needing to be refrigerated; when the control unit judges that the battery pack needs to be balanced, the control unit controls the power switch device to be conducted, so that the refrigerating sheet group is communicated with the battery pack and serves as a balanced load, the control unit controls redundant electric energy in the battery pack to be input into the refrigerating sheet group, the refrigerating sheet group consumes the redundant electric energy, the battery pack can be balanced quickly, meanwhile, the refrigerating sheet group consumes the electric energy, heat absorption refrigeration is realized, the service life of the battery pack is prevented from being influenced by overheating in the balancing process of the battery pack, and a better balancing effect is achieved. Furthermore, the control unit comprises a first comparator and a second comparator, a first input end of the first comparator is connected with a temperature information output end of the signal acquisition unit, a second input end of the first comparator is connected with a temperature threshold value storage, and an output end of the first comparator is connected with a power switch device for controlling an external power supply to be connected with the refrigerating sheet set.
The first input end of the second comparator is connected with the voltage information output end of the signal acquisition unit, the second input end of the second comparator is connected with the voltage threshold storage, and the output end of the second comparator is connected with the power switch device for controlling the communication between the battery pack and the refrigerating sheet set.
The signal acquisition unit transmits the acquired signals to the corresponding comparators, and the comparators receive the signals and judge the signals, so that whether the control signals are output to the corresponding power switch devices or not is determined, and the power switch devices are controlled to be closed.
Furthermore, the refrigerating sheet set is embedded on the shell, heat exchangers are attached to two sides of the refrigerating sheet set, and the heat exchanger far away from one side inside the shell extends out of the shell.
The heat exchanger can improve the heat transfer capacity between the refrigerating sheet set and the shell, accelerate the cooling speed and ensure the normal operation of equipment. Meanwhile, the heat exchanger is attached to the refrigerating sheet set, so that the refrigerating sheet set is directly contacted with the heat exchanger, and heat transfer is facilitated. And a heat exchanger on the refrigerating sheet group extends out of the shell, so that heat on the refrigerating sheet group can be discharged out of the shell to dissipate heat in time.
Furthermore, the part of the refrigerating unit group, which is attached to the heat exchanger, is coated with a heat conducting material.
The heat conducting material can increase the heat transfer capacity between the refrigerating sheet group and the heat exchanger.
Furthermore, the refrigerating fin group is attached to the outer wall or the inner wall of the shell.
According to the shape and the size of the battery pack shell, the refrigerating sheet set is designed outside the shell and absorbs heat through the shell; the refrigerating fin group is designed in the shell, the heating surface is tightly attached to the shell, and heat is dissipated through the shell, so that a heat exchanger is not needed, and the cost is saved.
Furthermore, the part of the refrigerating sheet group, which is attached to the shell, is coated with a heat conduction material.
The heat conduction material is more beneficial to the heat transfer between the refrigerating sheet set and the shell, and the heat dissipation effect is optimized.
Drawings
Fig. 1 is a schematic diagram of a hardware circuit in a housing of an embodiment of a battery system with a cooling equalization function according to the present invention.
Reference numerals: refrigerating plate group 1, heat exchanger 2.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The embodiment example is shown in the attached figure 1: the utility model discloses a group battery with balanced function of cooling, battery system, including group battery and the balanced system of cooling, the group battery can set up a plurality of (single electric core or parallelly connected battery module, hereinafter for short the group battery) as required, and the preferred series connection setting of a plurality of group batteries, and the group battery can be for the group battery of arbitrary material, specifically can be for but not limiting to the lithium cell group. The battery pack is externally provided with a shell, a signal acquisition unit and a control unit are arranged in the shell, the specific signal acquisition unit and the control unit can be arranged in a split mode or integrated mode (for example, the signal acquisition and control unit in the attached drawing 1 is arranged in an integrated mode), the signal acquisition unit comprises but is not limited to a temperature sensor (such as PT100) and a voltage sensor (such as an MIK-DZV single-phase direct-current voltage sensor) and/or a current sensor (such as a Hall type current sensor of SZ 1K-50), and the signal acquisition unit is close to the battery pack (such as the connection mode of the temperature sensor) or electrically connected with the battery pack (such as the connection mode of the voltage sensor and the current sensor) and is used for acquiring temperature information, voltage information and/or current. The control unit comprises a first comparator and a second comparator, the output end of the temperature sensor is electrically connected with the first input end of the first comparator, and the second input end of the first comparator is connected with a temperature threshold memory; the output end of the voltage sensor or the current sensor is electrically connected with the first input end of the second comparator, and the second input end of the second comparator is connected with the voltage or current threshold memory. The first type of comparator and the second type of comparator are preferably, but not limited to, LM324, LM 339.
The cooling equalization system comprises a refrigerating fin group 1 arranged on the shell, and the refrigerating fin group 1 adopts semiconductor refrigerating fins. According to the needs of users, the refrigerating sheet group 1 can be embedded on the shell, the two sides of the refrigerating sheet group 1 are respectively attached with the heat exchanger 2, the heat exchanger 2 far away from one side inside the shell extends out of the shell, the part where the refrigerating sheet group 1 is attached with the heat exchanger 2 is coated with a heat conduction material, the heat exchanger 2 can improve the heat transfer capacity between the refrigerating sheet group 1 and the shell, the heat dissipation effect is better, and the cost is relatively higher. The refrigerating sheet group 1 can be attached to the outer wall or the inner wall of the shell, the refrigerating sheet group 1 is fixedly connected with the shell (such as welding or bonding), heat conduction materials (such as heat conduction silicone grease and the like) are coated on the portion, attached to the shell, of the refrigerating sheet group 1, heat transfer is carried out through contact between the refrigerating sheet group 1 and the shell, a heat exchanger 2 is not needed, manufacturing cost is reduced, and meanwhile, the contradiction between the sealing performance and the heat dissipation performance of the battery pack assembly is objectively solved.
In this embodiment, a power supply end of the cooling fin group 1 is electrically connected to the battery pack or an external power supply through a power switch device, the power switch device includes a first switch and a second switch, the first switch is disposed between the cooling fin group and the external power supply, the second switch is disposed between the cooling fin group and the battery pack, the first switch and the second switch are electrically connected to output ends of the first comparator and the second comparator, and the first switch and the second switch are preferably but not limited to switching devices such as MOS transistors, IGBTs, relays, triodes, and the like. The control unit controls the external power supply to output electric energy to the refrigerating sheet set 1 for refrigeration, or the signal acquisition and control unit controls the battery pack to output electric energy to the refrigerating sheet set 1 to realize battery pack balance, and meanwhile, the refrigerating sheet set 1 realizes refrigeration by utilizing the electric energy output by the battery pack.
This embodiment is preferred, and second class comparator sets up a plurality ofly, and the second switch also sets up a plurality ofly, and the quantity of second class comparator and second switch should all be the same with group battery quantity (if the group battery is a plurality of electric cores of establishing ties, should be the same with the quantity of electric core), makes second class comparator can correspond one-to-one with the group battery, and the voltage sensor of the same reason also need set up a plurality ofly, makes it and group battery one-to-one, realizes the collection to every group battery voltage. In this embodiment, the thresholds in the voltage threshold memories of different comparators are different, such as comparator CijCollecting positive voltage V of ith row and j column battery pack2ijThe threshold value stored in the threshold value memory is (m-i) × a.
When the voltage signal received by one of the second type comparators is greater than the preset value in the voltage threshold memory, the second type comparator outputs a corresponding level signal (for example, high level), and the corresponding battery pack needs to be balanced.
And the output ends of all the second type comparators pass through the OR gate and then pass through the NOT gate to be connected with the enabling ends of the first type comparators.
When the battery pack does not need to be balanced (the enable end of the first type comparator receives high level), the signal acquisition unit detects that the temperature of the battery pack is too high, the temperature sensor transmits temperature information into the first type comparator, when the input temperature signal exceeds a temperature threshold value, the first type comparator outputs a control signal to the first switch, the first switch is closed, the refrigerating sheet set 1 is powered on and started, and the refrigerating sheet set 1 utilizes an external power supply to refrigerate. Specifically, a relay can be used as the first switch, an input loop of the relay is connected with the output end of the first comparator, and a normally open contact of the relay is connected in series in a power supply loop of an external power supply for supplying power to the refrigerating sheet set. When an external power supply is used for refrigeration, the temperature sensor detects the temperature value of the battery pack in real time and transmits the temperature value to the first type comparator, when the temperature of the battery pack is lower than or equal to a threshold value, the first switch is turned on, and the external power supply stops supplying power to the refrigerating sheet set 1.
This embodiment is preferred, and second type comparator sets up a plurality ofly, and the second switch also sets up a plurality ofly, and the quantity of second type comparator and second switch should all be the same with the battery quantity in the group battery for second type comparator can be with the group battery one-to-one, and voltage sensor and/or current sensor also need set up a plurality ofly in the same way, make it and group battery one-to-one, realize the collection to every group battery voltage. And each second type of comparator needs to be electrically connected with the corresponding refrigerating sheet through a second switch, and the number of the second switches is equal to that of the comparators.
Taking a second switch and a second comparator connected with the second switch as an example for explanation, when a voltage signal received by the second comparator is greater than a preset value in the voltage threshold memory, the second comparator outputs a control signal to the corresponding second switch to control the second switch to be closed, so that the refrigeration sheet corresponding to the second switch is communicated with the corresponding battery pack, the refrigeration sheet group 1 is used as a balanced load, and redundant electric energy in the battery is input into the corresponding refrigeration sheet. The refrigerating sheet set 1 consumes redundant electric energy to enable the battery pack to be balanced quickly, meanwhile, the refrigerating sheet set 1 consumes electric energy to achieve heat absorption and refrigeration, the service life of the battery pack is prevented from being influenced by overheating in the balancing process of the battery pack, and a better balancing effect is achieved.
Specifically, a relay can be used as a second switch, an input loop of the relay is connected with the output end of the second comparator, and a normally open contact of the relay is connected in series in a power supply loop of the battery pack for supplying power to the refrigerating sheet set. When the voltage of the battery pack is higher than the threshold value, the second comparator outputs an opening signal, the relay coil is electrified, the normally open contact of the relay coil is closed, and the battery pack supplies power to the refrigerating sheet set 1 to perform voltage equalization; when the voltage of the battery pack is lower than or equal to the threshold value, the second switch is turned on, and the battery pack stops supplying power to the refrigerating sheet group 1. In this embodiment, the thresholds in the voltage threshold memories of different comparators are different, such as comparator CijCollecting positive voltage V of ith row and j column battery pack2ijThe threshold value stored in the threshold value memory is (m-i) x a, a is the full charge voltage drop of each battery pack, i is more than or equal to 1 and less than or equal to m, j is more than or equal to 1 and less than or equal to n, m is the number of rows of the battery packs, n is the number of columns of the battery packs, m is more than or equal to 1, and n is more than or equal to 1.
Therefore, the voltage drop of each battery pack can meet the requirement, and the voltage of the positive electrode of each battery pack is constant no matter how the voltage of the negative electrode of the battery pack drifts, so that the balancing method is very beneficial to the service life and the balancing repair of the battery.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A battery system with a cooling equalization function is characterized by comprising a battery pack and a cooling equalization system, wherein a shell is arranged outside the battery pack, a signal acquisition unit and a control unit are arranged in the shell, the signal acquisition unit is connected with the battery pack, the signal comprises temperature information and voltage information of the battery pack, and a signal output end of the signal acquisition unit is connected with a corresponding information input end of the control unit;
the cooling equalization system comprises a refrigerating sheet set arranged on the shell, a power supply end of the refrigerating sheet set is connected with the battery pack or an external power supply end through a power switch device, and the power switch device is connected with a control signal output end of the control unit;
the control unit controls the external power supply to output electric energy to the refrigerating sheet set for refrigeration, or the control unit controls the battery pack to output electric energy to the refrigerating sheet set to realize battery pack balance, and meanwhile, the refrigerating sheet set realizes refrigeration by using the electric energy output by the battery pack.
2. The battery system with the cooling equalization function as claimed in claim 1, wherein the control unit comprises a first comparator and a second comparator, a first input end of the first comparator is connected with the temperature information output end of the signal acquisition unit, a second input end of the first comparator is connected with a temperature threshold value storage, and an output end of the first comparator is connected with a power switch device for controlling an external power supply to be connected with the refrigerating sheet set;
the first input end of the second comparator is connected with the voltage information output end of the signal acquisition unit, the second input end of the second comparator is connected with the voltage threshold storage, and the output end of the second comparator is connected with the power switch device for controlling the communication between the battery pack and the refrigerating sheet set.
3. The battery system with the cooling and balancing functions as claimed in claim 1, wherein the cooling fin set is embedded in the housing, the heat exchangers are attached to both sides of the cooling fin set, and the heat exchanger on the side far away from the inside of the housing extends out of the housing.
4. The battery system with the cooling equalization function as claimed in claim 3, wherein the part of the refrigerating fin group attached to the heat exchanger is coated with a heat conduction material.
5. The battery system with cooling equalization function as claimed in claim 1, wherein the cooling fin group is attached to the outer wall or the inner wall of the housing.
6. The battery system with the cooling and equalizing functions as claimed in claim 5, wherein the portion of the cooling fin group attached to the housing is coated with a heat conducting material.
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| CN202020365479.XU CN211790838U (en) | 2020-03-21 | 2020-03-21 | Battery system with cooling equalization function |
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| CN202020365479.XU CN211790838U (en) | 2020-03-21 | 2020-03-21 | Battery system with cooling equalization function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111245068A (en) * | 2020-03-21 | 2020-06-05 | 守恒新能源(重庆)有限公司 | Battery system with cooling equalization function and control method |
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- 2020-03-21 CN CN202020365479.XU patent/CN211790838U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111245068A (en) * | 2020-03-21 | 2020-06-05 | 守恒新能源(重庆)有限公司 | Battery system with cooling equalization function and control method |
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