TWI695563B - Electric vehicle power storage device - Google Patents

Abstract

An electric vehicle power storage device includes a housing unit, a battery unit, a first connection port, a second connection port, and a control unit. The battery cell unit is used to store electrical energy and includes a plurality of battery cells. The first connection port is electrically connected to the cell unit and used for sending electrical energy from the housing unit to the cell unit for storage and includes a first positive line and a first negative line. The second connection port is electrically connected to the cell unit and used for sending electrical energy from the housing unit to the cell unit for storage and includes a second positive line and a second negative line. The control unit is electrically connected between the cell unit and the first port and between the cell unit and the second port. The control unit detects and controls the amount of electrical energy sent from the first port and the second port to the cell unit for storage.

Description

Electric vehicle power storage device

The invention relates to an energy storage device (energy storage device), in particular to an electric vehicle (EV) electric storage device.

Generally speaking, the batteries used in existing electric vehicles with less than four wheels (for example: electric locomotives) all use lithium ion batteries as cells. Since lithium ion batteries have high open circuit voltage and high energy The characteristics of density, so the major electric vehicle manufacturers hope to further shorten the charging time (charging time). Among them, a common practice is to increase the size of the charging current, for example, to increase the charging current of a single cell from about 600mA to about 1000mA to shorten the charging time from five hours to three hours.

However, because lithium-ion batteries do not tolerate overcharging and are prone to thermal decay, when the fast charging mode with increased charging current is adopted, it is easier to reduce the battery life compared to the standard charging mode. Therefore, existing electric vehicle batteries still have Room for further improvement.

Therefore, the object of the present invention is to provide an electric vehicle power storage device with a battery protection mechanism dedicated to rapid charging.

Therefore, the electric storage device of the electric vehicle of the present invention includes a housing unit, a battery cell unit, a first connection port, a second connection port, and a control unit.

The housing unit defines a receiving space.

The cell unit is disposed in the accommodating space and used to store electrical energy. The battery cell unit includes a plurality of battery cells electrically connected together.

The first connection port is disposed on the housing unit and electrically connected to the battery unit. The first connection port is used to send electrical energy from the housing unit to the battery unit for storage. The first connection port includes a first positive wire electrically connected to the cell unit, and a first negative wire electrically connected to the cell unit.

The second connection port is disposed on the casing unit and electrically connected to the battery unit. The second connection port is used to send electrical energy from the housing unit to the battery unit for storage. The second connection port includes a second positive wire electrically connected to the cell unit, and a second negative wire electrically connected to the cell unit.

The control unit is disposed in the accommodating space and electrically connected between the cell unit and the first connection port and between the cell unit and the second connection port. The control unit detects and controls the amount of electrical energy sent from the first port and the second port to the cell unit for storage.

The effect of the present invention is that, by adding the second port in addition to the first port, when the battery unit adopts the charging mode of different current sizes, it can pass through different current tolerances and different The charging is restricted by the protected port, so when the electric vehicle power storage device performs fast charging with a large current, the damage to the battery cell can be greatly reduced.

1: Shell unit

11: accommodating space

2: battery cell unit

21: battery cell

3: the first port

31: The first positive wire

32: the first negative line

4: Second port

41: Second positive wire

42: Second negative wire

5: control unit

51: The first disconnection protection module

52: Second break protection module

54: Second unidirectional current element

6: Cooling unit

9: external power supply unit

91: First power connector

92: Second power connector

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: FIG. 1 is a block schematic diagram of an embodiment of the electric storage device of the electric vehicle of the present invention.

Referring to FIG. 1, it is an embodiment of the electric vehicle power storage device of the present invention. The electric vehicle power storage device includes a housing unit 1, a battery unit 2, a first connection port 3, and a second connection port 4. A control unit 5, and a cooling unit 6.

The housing unit 1 defines a receiving space 11.

The cell unit 2 is disposed in the accommodating space 11 and used to store electrical energy. The battery cell unit 2 includes a plurality of battery cells 21 electrically connected together. In this embodiment, each battery cell 21 is a lithium ion (Lithium ion) battery, but it is not limited thereto. want It is explained that the number of the battery cells 21 shown in FIG. 1 is only an illustration. In actual application, the number of the battery cells 21 used is based on the operating voltage and operating current required by the electric motor of the electric vehicle Depending on the specifications.

The first connection port 3 is disposed on the housing unit 1 and is electrically connected to the battery unit 2. The first connection port 3 is used to send electrical energy from the housing unit 1 to the battery unit 2 for storage. The first connection port 3 includes a first positive wire 31 electrically connected to the cell unit 2, and a first negative wire 32 electrically connected to the cell unit 2. In this embodiment, the first connection port 3 is also used to send electrical energy from the cell unit 2 to the outside of the housing unit 1, that is to say, the first connection port 3 is actually a type that can be used for charging and Discharge bidirectional port.

The second connection port 4 is disposed on the housing unit 1 and is electrically connected to the cell unit 2. The second connection port 4 is used to send electrical energy from the housing unit 1 to the battery unit 2 for storage. The second connection port 4 includes a second positive wire 41 electrically connected to the cell unit 2 and a second negative wire 42 electrically connected to the cell unit 2. In this embodiment, the second port 4 is only used to send electrical energy from the housing unit 1 to the battery unit 2 for storage, that is to say, the second port 4 is actually only used for One-way port for charging.

It should be noted that the relative positions of the first connection port 3 and the second connection port 4 on the housing unit 1 shown in FIG. 1 are only schematic. In practical applications, the first connection port 3 and The second connection port 4 may be located on any surface of the housing unit 1 The opposite sides of the can also be located in the center of any surface of the housing unit 1 adjacent to each other, or even located in such a manner that the first connection port 3 is embedded in the center of the second connection port 4 Any surface of the housing unit 1.

The control unit 5 is disposed in the accommodating space 11 and electrically connected between the cell unit 2 and the first connection port 3 and between the cell unit 2 and the second connection port 4. The control unit 5 detects and controls the amount of electrical energy sent from the first port 3 and the second port 4 to the cell unit 2 for storage. In this embodiment, the control unit 5 is actually a battery management system (BMS).

The control unit 5 includes a first disconnection protection module 51 that is electrically connected between the first positive wire 31 and the cell unit 2, and one that is electrically connected to the second positive wire 41 and the cell unit 2之间的second trip protection module 52. In this embodiment, the first circuit breaker protection module 51 has at least one of an insulated gate bipolar transistor (IGBT) circuit breaker, a fuse circuit breaker, a fuseless circuit breaker, and a relay, and the second The circuit breaker protection module 52 also has at least one of an insulated gate bipolar transistor circuit breaker, a fuse circuit breaker, a fuseless circuit breaker, and a relay.

The second disconnection protection module 52 has a second unidirectional current element 54 electrically connected between the second positive wire 41 and the cell unit 2. The second unidirectional current element 54 is used to allow current to flow only from the second positive wire 41 to the cell unit 2 but not from the cell unit 2 to the second positive wire 41. In this embodiment, the second unidirectional current element 54 is a diode element that adopts forward bias, but it is not limited thereto.

The cooling unit 6 is disposed in the accommodating space 11 and is used to maintain the temperature of the cell unit 2 within a fixed temperature range, for example, between 10°C and 45°C. In this embodiment, the cooling unit 6 performs heat exchange on the cell unit 2 through the circulation of the refrigerant. The refrigerant of the cooling unit 6 is liquid water, but not limited to this.

The use of the electric vehicle power storage device of the present invention during charging is exemplified below.

Referring to FIG. 1, when the electric vehicle power storage device needs to be charged, if the user decides to use the standard charging mode (the charging current is small and the charging time is long), an external power supply unit 9 (for example: a charging station) A first power connector 91 is connected to the first port 3; if the user decides to use the fast charging mode (the charging current is larger and the charging time is shorter), a second power connector 92 of the external connection unit 9 can be connected Connect the second port 4. It can be understood that the second port 4 and the second disconnection protection module 52 have a higher current voltage (power) resistance than the first port 3 and the first disconnection protection module 51 Acceptability.

It should be noted that, since the standard charging mode and the fast charging mode are generally only used one by one, in practical applications, the first power supply connector 91 and the second power supply connector 92 of the external power supply unit 9 can be matched The composite cable integrates the first power supply connector 91 and the second power supply connector 92 into the same connector housing to form an appearance with only one extension cable.

After the charging starts, when the control unit 5 detects that the current of the first positive line 31 is not less than a first upper limit (for example: in the standard charging mode, the maximum current exceeds 50A), the control unit 5 The first disconnection protection module 51 is controlled so that the first positive wire 31 and the cell unit 2 are not connected. When the control unit 5 detects that the current of the second positive wire 41 is not less than a second upper limit (for example: in the fast charging mode, the maximum current exceeds 100A), the control unit 5 controls the second disconnection The protection module 52 prevents the second positive wire 41 from being connected to the cell unit 2. It can be understood that although the second upper limit value is greater than the first upper limit value in this embodiment, it is not limited thereto.

During charging, the second unidirectional current element 54 has the function of preventing DC reverse recharge, and the cooling unit 6 can fully absorb the heat generated by the battery unit 2 during charging to prevent the battery cells 21 Heat decay.

Through the above description, the advantages of the present invention are summarized as follows:

1. In the present invention, by adding the second port 4 in addition to the first port 3, when the battery cell 2 adopts the charging mode with different current magnitudes, it can pass through different current tolerances and Compared with the existing electric vehicle battery, the charging of the port with different protection limits can greatly reduce the possible damage to the battery unit 2 when the electric vehicle electric storage device performs fast charging with a large current .

2. The present invention is provided with the cooling unit 6 in the housing unit 1. Compared with the existing electric vehicle battery, the present invention when the battery unit 2 is charged, regardless of Whatever charging mode the user adopts, the operating temperature of the battery cell 21 can be kept within an appropriate temperature range, which effectively reduces the probability of reducing the occurrence of thermal decay, so the service life of the battery cell 2 can be further extended.

In summary, the purpose of cost invention can indeed be achieved.

However, the above are only examples of the present invention, and the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as Within the scope of the invention patent.

1: Shell unit

11: accommodating space

2: battery cell unit

21: battery cell

3: the first port

31: The first positive wire

32: the first negative line

4: Second port

5: control unit

51: The first disconnection protection module

52: Second break protection module

54: Second unidirectional current element

6: Cooling unit

9: external power supply unit

91: First power connector

92: Second power connector

41: Second positive wire

42: Second negative line

Claims (6)

An electric vehicle power storage device includes: a housing unit that defines an accommodating space; and a cell unit that is disposed in the accommodating space and used to store electrical energy. The cell unit includes a plurality of batteries that are electrically connected together Core; a first connection port, which is provided in the housing unit and electrically connected to the battery unit, the first connection port is used to allow electrical energy to be sent from the housing unit to the battery unit for storage, or to allow electrical energy from the The cell unit is sent out of the housing unit, the first connection port includes a first positive line electrically connected to the cell unit, and a first negative line electrically connected to the cell unit; a second connection port, The second connection port is a one-way connection port, which is arranged in the housing unit and is electrically connected to the battery unit. The current is greater than the charging current of the first port, the second port includes a second positive line electrically connected to the cell unit, and a second negative line electrically connected to the cell unit; and a control unit, provided In the accommodating space and electrically connected between the cell unit and the first port and between the cell unit and the second port, the control unit detects and controls the slave port and the first port The amount of electrical energy stored in the second cell is sent to the cell unit; wherein, the control unit includes a first disconnection protection module electrically connected between the first positive line and the cell unit, and an electric A second disconnection protection module connected between the second positive line and the cell unit; Wherein, when the control unit detects that the current of the first positive line is not less than a first upper limit, the control unit controls the first disconnection protection module so that the first positive line and the cell unit When the control unit detects that the current of the second positive line is not less than a second upper limit, the control unit controls the second disconnection protection module so that the second positive line and the There is no conduction between the cell units; wherein, the second upper limit value is greater than the first upper limit value. The electric vehicle power storage device according to claim 1, wherein the second disconnection protection module has a second unidirectional current element electrically connected between the second positive line and the cell unit, the first The two unidirectional current elements are used to allow current to flow only from the second positive line to the cell unit, but not from the cell unit to the second positive line. The electric vehicle power storage device according to claim 2, wherein the second unidirectional current element is a diode element that adopts forward bias. The electric vehicle power storage device according to claim 1, further comprising a cooling unit disposed in the accommodating space, the cooling unit is used to maintain the temperature of the cell unit within a fixed temperature range. The electric vehicle power storage device according to claim 4, wherein the cooling unit performs heat exchange through a refrigerant circulation. The electric vehicle power storage device according to claim 5, wherein the refrigerant of the cooling unit is liquid water.

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