Battery system and battery pack

Abstract

The utility model relates to a battery system and a battery pack. The battery system comprises a first power supply end, a second power supply end, a first battery pack, a second battery pack, a first switch unit, a second switch unit, a power conversion unit and a controller, the first end of the first battery pack is connected with a first power supply end through the first switch unit, the second end of the first battery pack is connected with the first power supply end through the second switch unit after being connected with the first end of the second battery pack, and the second end of the second battery pack is connected with a second power supply end; the first switch unit and the second switch unit are respectively connected with the controller and are used for receiving a control level output by the controller so as to switch on one of the first switch unit and the second switch unit; the power conversion unit is connected with the first battery pack, the second battery pack and the controller and used for receiving the control level output by the controller to achieve energy transfer between the second battery pack and the first battery pack. According to the utility model, a plurality of different voltage platforms can be compatible, so that the whole system can satisfy more working scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field more specifically, relate to a kind of battery system and battery pack. BACKGROUND

[0002] With the vigorous development of new energy industry, the application scenarios of lithium-ion batteries are more and more, and the market of electric bicycle and tricycle batteries appears the application scenarios of battery replacement or battery rental for users. Since there are several lithium battery voltage platforms such as 48V, 60V and 72V for electric vehicles, the corresponding battery has 16 strings, 20 strings, 24 strings of lithium iron phosphate or 13 strings, 17 strings and 20 strings of lithium manganate battery pack and other models. In order to reduce the battery models put into the market, it is necessary to design the battery pack to be compatible with multiple different voltage platforms. SUMMARY

[0003] The technical problem to be solved by the utility model is that the above-mentioned battery system of the prior art cannot be compatible with multiple different voltage platforms, and a battery system and a battery pack are provided.

[0004] The technical solution adopted by the utility model to solve its technical problem is: a battery system is constructed, which comprises: a first power supply end, a second power supply end, a first battery pack, a second battery pack, a first switch unit, a second switch unit, a power supply conversion unit and a controller;

[0005] The first end of the first battery pack is connected to the first power supply end through the first switch unit, the second end of the first battery pack is connected to the first end of the second battery pack, and the second end of the second battery pack is connected to the second power supply end through the second switch unit.

[0006] The first switch unit and the second switch unit are respectively connected to the controller for receiving the control level output by the controller to switch on one of the first switch unit and the second switch unit.

[0007] The power supply conversion unit is connected to the first battery pack, the second battery pack and the controller for receiving the control level output by the controller to realize the energy transfer between the second battery pack and the first battery pack.

[0008] Preferably, in the battery system of the utility model, the first switch unit comprises a first discharge switch and a first charging switch;

[0009] The first discharge switch is connected to the first control level output pin of the controller for receiving the control level output by the controller to turn on, so that the first battery pack and the second battery pack provide voltage output through the first power supply end;

[0010] The first charging switch is connected to a second control level output pin of the controller, and is used for receiving a control level output by the controller to turn on, so that the external power input charges the first battery pack and the second battery pack through the first power terminal.

[0011] Preferably, in the battery system, the second switch unit comprises a second discharging switch and a second charging switch.

[0012] The second discharging switch is connected to a third control level output pin of the controller, and is used for receiving a control level output by the controller to turn on, so that the second battery pack outputs voltage through the first power terminal.

[0013] The second charging switch is connected to a fourth control level output pin of the controller, and is used for receiving a control level output by the controller to turn on, so that the external power input charges the second battery pack through the first power terminal.

[0014] Preferably, in the battery system, the power conversion unit comprises a bidirectional DCDC conversion circuit, high-voltage side power terminals of the bidirectional DCDC conversion circuit are connected to the first end and the second end of the first battery pack respectively, and low-voltage side power terminals of the bidirectional DCDC conversion circuit are connected to the first end and the second end of the second battery pack respectively.

[0015] The high-voltage side control terminal of the bidirectional DCDC conversion circuit and the low-voltage side control terminal of the bidirectional DCDC conversion circuit are connected to the controller respectively, and are used for receiving a control level of the controller to turn on or turn off.

[0016] Preferably, in the battery system, the bidirectional DCDC conversion circuit comprises a transformer, a primary side bridge circuit connected to the primary side of the transformer and the second battery pack, a secondary side bridge circuit connected to the secondary side of the transformer and the first battery pack, a first drive circuit connected to the primary side bridge circuit, and a second drive circuit connected to the secondary side bridge circuit.

[0017] The first drive circuit is connected to the controller, and is used for receiving a control level generated by the controller to drive the primary side bridge circuit to work.

[0018] The second drive circuit is connected to the controller, and is used for receiving a control level generated by the controller to drive the secondary side bridge circuit to work.

[0019] Preferably, in the battery system, the first battery pack comprises a plurality of series-connected battery cells and a short-circuit protection unit connected in series with the battery cells.

[0020] Preferably, the battery system comprises a short-circuit protection unit.

[0021] Preferably, the battery system comprises a second battery pack comprising a plurality of battery cells connected in series.

[0022] Preferably, the battery system comprises a first battery pack comprising a plurality of battery cells connected in series.

[0023] The utility model also constructs a kind of battery pack, including the battery system as described above.

[0024] The battery system and battery pack of the utility model have the following beneficial effects: multiple different voltage platforms can be compatible, so that the whole system meets more working scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0025] The utility model will be further described below by combining with drawings and examples, and drawings are as follows:

[0026] Figure 1 It is the structural schematic diagram of one embodiment of the battery system of the utility model;

[0027] Figure 2 It is the structural schematic diagram of another embodiment of the battery system of the utility model;

[0028] Figure 3 It is the partial circuit schematic diagram of one embodiment of the battery system of the utility model. DETAILED DESCRIPTION

[0029] In order to have more clear understanding of the technical features, purposes and effects of the utility model, the specific implementation mode of the utility model will be described in detail by comparing with drawings.

[0030] As shown in Figure 1 the embodiment of the battery system of the utility model is shown. In Figure 1In the shown embodiment of the battery system, the battery system comprises: a first power supply end 111, a second power supply end 112, a first battery pack 121, a second battery pack 122, a first switch unit 131, a second switch unit 132, a power supply conversion unit 140 and a controller 150; the first end of the first battery pack 121 is connected with the first power supply end 111 through the first switch unit 131, the second end of the first battery pack 121 is connected with the first end of the second battery pack 122, and the first end of the second battery pack 122 is connected with the first power supply end 111 through the second switch unit 132, and the second end of the second battery pack 122 is connected with the second power supply end 112; the first switch unit 131 and the second switch unit 132 are respectively connected with the controller 150, and are used for receiving the control level output by the controller 150 to switch on one of the first switch unit 131 and the second switch unit 132; the power supply conversion unit 140 is connected with the first battery pack 121, the second battery pack 122 and the controller 150, and is used for receiving the control level output by the controller 150 to realize the energy transfer between the second battery pack 122 and the first battery pack 121.

[0031] Specifically, the battery system connects a load or a power supply device through the first power terminal 111 and the second power terminal 112. The first battery pack 121 and the second battery pack 122 are connected in series. The controller 150 controls one of the first switch unit 131 and the second switch unit 132 to be conductive, i.e., only one of the first switch unit 131 and the second switch unit 132 is in the conductive state. When the controller 150 controls the first switch unit 131 to be conductive, the second switch unit 132 is set to be non-conductive at this time. The first power terminal 111 forms a loop with the second power terminal 112 through the first battery pack 121 and the second battery pack 122 connected in series. If the first power terminal 111 and the second power terminal 112 connect a load at this time, the first battery pack 121 and the second battery pack 122 can supply power to the load. If the first power terminal 111 and the second power terminal 112 connect a power supply at this time, the first battery pack 121 and the second battery pack 122 can be charged simultaneously by the power supply. When the controller 150 controls the second switch unit 132 to be conductive, the first switch unit 131 is set to be non-conductive at this time. The first power terminal 111 forms a loop with the second power terminal 112 through the second battery pack 122. If the first power terminal 111 and the second power terminal 112 connect a load at this time, the second battery pack 122 can supply power to the load. If the first power terminal 111 and the second power terminal 112 connect a power supply at this time, the second battery pack 122 can be charged simultaneously by the power supply. At the same time, the controller 150 controls the working state of the power conversion unit 140, so that the power conversion unit 140 is in the non-conductive state or the working state. When the power conversion unit 140 is in the working state, the controller 150 can control the power conversion unit 140 to input the output of the first battery pack 121 to the second battery pack 122 after energy conversion, or control the power conversion unit 140 to input the output of the second battery pack 122 to the first battery pack 121 after energy conversion.

[0032] Through the above process, the controller 150 can switch the first battery pack 121 and the second battery pack 122 to supply power as needed, and then adjust the output voltage of the battery system (corresponding to the output voltage of the first power terminal and the second power terminal) to enable the battery system to meet different power supply voltage platforms.

[0033] In an embodiment, as Figure 2As shown, the first switch unit 131 includes a first discharge switch and a first charge switch; the first discharge switch is connected to a first control level output pin of the controller 150, for receiving the control level output by the controller 150 to turn on, so that the first battery pack 121 and the second battery pack 122 provide voltage output through the first power terminal 111; the first charge switch is connected to a second control level output pin of the controller 150, for receiving the control level output by the controller 150 to turn on, so that the external power input charges the first battery pack 121 and the second battery pack 122 through the first power terminal 111. Specifically, in the first switch unit 131, the main working loop is controlled to be in a discharge state or a charge state through the first discharge switch and the first charge switch respectively. When the first power terminal 111 and the second power terminal 112 are connected to a load, it indicates that the main working loop is in the discharge state, and the controller 150 controls the first discharge switch to turn on, so that the first battery pack 121 and the second battery pack 122 supply power to the load. When the first power terminal 111 and the second power terminal are connected to a power supply, it indicates that the main working loop is in the charge state, and the controller 150 controls the first charge switch to turn on, so that the first battery pack 121 and the second battery pack 122 are charged simultaneously by the power supply.

[0034] As shown in the embodiment, Figure 2 As shown, the second switch unit 132 includes a second discharge switch and a second charge switch; the second discharge switch is connected to a third control level output pin of the controller 150, for receiving the control level output by the controller 150 to turn on, so that the second battery pack 122 provides voltage output through the first power terminal 111; the second charge switch is connected to a fourth control level output pin of the controller 150, for receiving the control level output by the controller 150 to turn on, so that the external power input charges the second battery pack 122 through the first power terminal 111. Specifically, in the second switch unit 132, the main working loop is controlled to be in a discharge state or a charge state through the second discharge switch and the second charge switch respectively. When the first power terminal 111 and the second power terminal 112 are connected to a load, it indicates that the main working loop is in the discharge state, and the controller 150 controls the second discharge switch to turn on, so that the second battery pack 122 supplies power to the load. When the first power terminal 111 and the second power terminal are connected to a power supply, it indicates that the main working loop is in the charge state, and the controller 150 controls the second charge switch to turn on, so that the second battery pack 122 is charged by the power supply.

[0035] As shown in the embodiment, Figure 2 and Figure 3As shown, in one embodiment, the power conversion unit 140 includes a bidirectional DC-DC converter circuit. The high-voltage side power supply terminal of the bidirectional DC-DC converter circuit is connected to the first and second terminals of the first battery pack 121, respectively, and the low-voltage side power supply terminal of the bidirectional DC-DC converter circuit is connected to the first and second terminals of the second battery pack 122, respectively. The high-voltage side control terminal and the low-voltage side control terminal of the bidirectional DC-DC converter circuit are respectively connected to a controller 150, for receiving control levels from the controller 150 to turn the circuit on or off. That is, energy transfer between the first battery pack 121 and the second battery pack 122 can be achieved through the bidirectional DC-DC converter circuit.

[0036] like Figure 3 As shown, in one embodiment, the bidirectional DC-DC converter circuit includes: a transformer, a primary-side bridge circuit connected to the primary side of the transformer and the second battery pack 122, a secondary-side bridge circuit connected to the secondary side of the transformer and the first battery pack 121, a first drive circuit connected to the primary-side bridge circuit, and a second drive circuit connected to the secondary-side bridge circuit; the first drive circuit is connected to a controller 150 and is used to receive control levels generated by the controller 150 to drive the primary-side bridge circuit to work respectively; the second drive circuit is connected to the controller 150 and is used to receive control levels generated by the controller 150 to drive the secondary-side bridge circuit to work. Specifically, in one embodiment, the bidirectional DC-DC converter circuit may include a transformer 141, a primary-side bridge circuit 142 connected to the primary side of the transformer 141 and the first battery pack 121, a secondary-side bridge circuit 143 connected to the secondary side of the transformer 141 and the second battery pack 122, a first drive circuit 144 connected to the primary-side bridge circuit 142, and a second drive circuit 145 connected to the secondary-side bridge circuit 143. The first drive circuit 144 and the second drive circuit 145 are connected to a controller 150. The controller 150 controls the operation of the first drive circuit 144 and the second drive circuit 145 by outputting a control level to realize the working process of the bidirectional DC-DC converter circuit. For example, the controller 150 outputs a control level to enable the output of the first battery pack 121 to power the second battery pack 122 through the primary-side bridge circuit 142, transformer 141, and secondary-side bridge circuit 143; or the controller 150 outputs a control level to enable the output of the second battery pack 122 to power the first battery pack 121 through the secondary-side bridge circuit 143, transformer 141, and primary-side bridge circuit 142. Wherein, as... Figure 3As shown, the transformer 141 includes a transformer T1, the first end and the second end of the transformer T1 are connected with the secondary side bridge circuit 143, and the third end and the fourth end of the transformer T1 are respectively connected with the primary side bridge circuit 142. The primary side bridge circuit 142 is composed of MOS tubes D1, D2, D3 and D4, and the first driving circuit 144 outputs a PWM level according to the control level of the controller 150 to control the working process of the primary side bridge circuit 142. The secondary side bridge circuit 143 is composed of MOS tubes D5, D6, D7 and D8. The second driving circuit 145 outputs a PWM level according to the control level of the controller 150 to control the working process of the secondary side bridge circuit 143.

[0037] In an embodiment, the first battery pack 121 includes a plurality of series-connected battery cells and a short-circuit protection unit connected in series with the battery cells. Specifically, the first battery pack 121 is connected by a plurality of battery cells to obtain the required voltage by series connection of the plurality of battery cells. In an embodiment, as shown in the figure, the first battery pack 121 is connected by series connection of four battery cells. At the same time, the plurality of battery cells are also connected in series with the short-circuit protection unit. In order to prevent the first end and the second end of the first battery pack 121 from being short-circuited to cause damage to the circuit when the first switch unit 131 and the second switch unit 132 are simultaneously turned on. The short-circuit protection unit automatically opens the circuit when the first end and the second end of the first battery pack 121 are short-circuited and a large current appears. In a specific embodiment, the short-circuit protection unit can be a fuse. Figure 2

[0038] In an embodiment, the second battery pack 122 includes a plurality of series-connected battery cells. That is, the second battery pack 122 is connected by a plurality of battery cells, such as a plurality of series-connected battery cells to obtain the required voltage. In an embodiment, as shown in the figure, the second battery pack 122 is connected by series connection of sixteen battery cells. Among them, since the second battery pack 122 is the main working battery pack, the number of battery cells in the second battery pack 122 is greater than that in the first battery pack 121. Figure 2 In addition, the utility model discloses a battery pack, including above-mentioned battery system, that is to construct a battery pack, and the inside is provided with above-mentioned battery system, and the same battery pack is realized with different power supply platforms through the battery pack.

[0039]

[0040] ​​It can be understood that the above embodiment only expresses the preferred embodiment of the utility model, the description is more specific and detailed, but it can not be understood as the limitation of the utility model patent scope; it should be pointed out that for ordinary skilled person in the art, the above technical features can be freely combined without departing from the concept of the utility model, and a number of deformations and improvements can be made, which belong to the protection scope of the utility model; therefore, any equivalent transformation and modification within the scope of the utility model patent claim should belong to the scope of the utility model patent claim.

Claims

1. A battery system characterized by, The application relates to a power supply device, which comprises a first power supply end, a second power supply end, a first battery pack, a second battery pack, a first switch unit, a second switch unit, a power supply conversion unit and a controller. The first end of the first battery pack is connected to the first power supply end through the first switch unit, the second end of the first battery pack is connected to the first end of the second battery pack, and the second end of the second battery pack is connected to the second power supply end through the second switch unit. The first switch unit and the second switch unit are respectively connected to the controller, and are used for receiving control levels output by the controller to switch on one of the first switch unit and the second switch unit. The power supply conversion unit is connected to the first battery pack, the second battery pack and the controller, and is used for receiving control levels output by the controller to realize energy transfer between the second battery pack and the first battery pack. The first switch unit comprises a first discharge switch and a first charging switch.

2. The battery system of claim 1, wherein, The first discharge switch is connected to a first control level output pin of the controller, and is used for receiving a control level output by the controller to switch on, so that the first battery pack and the second battery pack provide voltage output through the first power supply end. The first charging switch is connected to a second control level output pin of the controller, and is used for receiving a control level output by the controller to switch on, so that external power input charges the first battery pack and the second battery pack through the first power supply end. The second switch unit comprises a second discharge switch and a second charging switch.

3. The battery system of claim 1, wherein, The second discharge switch is connected to a third control level output pin of the controller, and is used for receiving a control level output by the controller to switch on, so that the second battery pack provides voltage output through the first power supply end. The second charging switch is connected to a fourth control level output pin of the controller, and is used for receiving a control level output by the controller to switch on, so that external power input charges the second battery pack through the first power supply end. The power supply conversion unit comprises a bidirectional DCDC conversion circuit, the high-voltage side power supply end of the bidirectional DCDC conversion circuit is respectively connected to the first end and the second end of the first battery pack, and the low-voltage side power supply end of the bidirectional DCDC conversion circuit is respectively connected to the first end and the second end of the second battery pack.

4. The battery system of claim 1, wherein, The high-voltage side control end of the bidirectional DCDC conversion circuit and the low-voltage side control end of the bidirectional DCDC conversion circuit are respectively connected to the controller, and are used for receiving control levels of the controller to switch on or off. The bidirectional DCDC conversion circuit comprises a transformer, a primary side bridge circuit connected to the primary side of the transformer and the first battery pack, a secondary side bridge circuit connected to the secondary side of the transformer and the second battery pack, a first drive circuit connected to the primary side bridge circuit, and a second drive circuit connected to the secondary side bridge circuit.

5. The battery system of claim 4, wherein, The first drive circuit is connected to the controller, and is used for receiving control levels generated by the controller to drive the primary side bridge circuit to work. ​ The second driving circuit is connected to the controller and is configured to receive a control level generated by the controller to drive the secondary side bridge circuit to work.

6. The battery system of claim 1, wherein, The first battery pack includes a plurality of series-connected battery cells and a short-circuit protection unit connected in series with the battery cells.

7. The battery system of claim 6, wherein, The short-circuit protection unit includes a fuse.

8. The battery system of claim 6, wherein, The second battery pack includes a plurality of series-connected battery cells.

9. The battery system of claim 2, wherein, The number of battery cells in the first battery pack is less than the number of battery cells in the second battery pack.

10. A battery pack, characterized by, A battery system including any one of the battery systems of claims 1-9.

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