Household energy storage battery connection structure that takes into account both high and low voltage application scenarios

Abstract

The utility model discloses a household energy storage battery connection structure that takes into account both high and low voltage application scenarios. The positive electrode of the battery module is connected to the positive electrode of the upper connector of the series circuit, and is connected to the positive electrodes of the upper connector of the parallel circuit and the lower connector of the parallel circuit through the first fuse A; the BMU battery control slave board is connected to the upper connector of the series circuit and the lower connector of the series circuit respectively; the PDU power box is connected to the two-way switch through one end of the cable, the battery pack is a module stacking structure, and the positive and negative electrodes of the upper connector of the parallel circuit and the positive and negative electrodes of the upper connector of the parallel circuit of another battery pack are connected in parallel with the positive and negative electrodes of the control box; the positive and negative electrodes of the control box are connected in series with the positive and negative electrodes of the battery pack. It can take into account both high and low voltage application scenarios, and is economical, efficient and practical; and the control circuit performs autonomous switching, which solves the problem that the low-voltage household energy storage battery technology cannot meet the needs of high-voltage application scenarios, and the high-voltage household energy storage battery technology cannot meet the needs of low-voltage application scenarios.

Description

Technical Field

[0001] The utility model relates to a high- and low-voltage application scenario control device for an energy storage battery, and in particular to a household energy storage battery connection structure that takes into account both high- and low-voltage application scenarios. Background Art

[0002] The essence of household storage is to solve the economic and stability of energy use. Therefore, residents configure household storage mainly to reduce household energy costs and improve power supply stability. The three major factors of technology, economy, and externality determine the demand intention, and the long-term positive trend remains unchanged. According to the voltage level of the total voltage after multiple battery packs are connected in series or in parallel, household storage battery packs can be divided into low-voltage battery systems and high-voltage battery systems.

[0003] The low-voltage battery system generally has a nominal voltage of 48V / 51.2V and is connected to the DC side interface of the inverter. Due to the more mature manufacturing process and more stable and mature BMS technology, the low-voltage battery system is cheaper overall, and it is easier to install and expand. However, due to the low voltage, the current is large, the wire diameter is large, and the copper loss is large, resulting in greater loss I²R, so the overall efficiency is lower.

[0004] High-voltage battery systems usually have multiple cells connected in series to form a total voltage of more than 100V, which is connected to the DC side interface of the inverter. Unlike low-voltage battery systems, the total voltage is higher and the current is smaller, and the loss I²R is smaller, so the efficiency is higher, and the smaller current has less disturbance to the system EMC test. However, higher voltages have higher requirements for line insulation, which makes it easier to produce arcs or breakdowns, resulting in reduced safety. In addition, the number of cells connected in series is greater, which requires a higher ability of the BMS to manage the consistency of the cells, which in turn leads to higher costs for the supporting BMS, such as the need for components with higher voltage ratings.

[0005] The existing household energy storage battery power supply technology in the market is relatively simple, and the demand for high-voltage power supply has gradually formed from the previous low-voltage power supply. With the diversification of the market and the diversification of demand, there are defects that low-voltage household energy storage battery technology cannot meet the needs of high-voltage application scenarios, and there are defects that high-voltage household energy storage battery technology cannot meet the needs of low-voltage application scenarios. Summary of the invention

[0006] In view of the above-mentioned problems, the utility model provides a household energy storage battery connection structure that takes into account both high and low voltage application scenarios, which can simultaneously meet the needs of low-voltage household energy storage battery and high-voltage household energy storage battery application scenarios, and realize autonomous switching between high and low voltage without replacing the battery.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions. A household energy storage battery connection structure that takes into account both high and low voltage application scenarios, including a battery pack and a control box in the form of a module stack,

[0008] The battery pack shell is in the shape of a rectangular parallelepiped, with a parallel circuit upper connector mounted above one end and a parallel circuit lower connector mounted below; with a series circuit upper connector mounted above the other end and a series circuit lower connector mounted below; a battery module is mounted in the battery pack, and the battery module is composed of a number of battery blocks connected in series; the positive electrode of the battery module is connected to the positive electrode of the series circuit upper connector, and is connected to the positive electrodes of the parallel circuit upper connector and the parallel circuit lower connector respectively through the first fuse A; the negative electrode of the battery module is connected to the negative electrode of the parallel circuit upper connector and the parallel circuit lower connector respectively, and is connected to the negative electrode of the series circuit lower connector through the second fuse A, and the negative electrode of the series circuit upper connector is connected to the negative electrode of the series circuit lower connector; the BMU battery control slave board is connected to the series circuit upper connector and the series circuit lower connector respectively; and is connected to the parallel circuit upper connector and the parallel circuit lower connector respectively at the same time;

[0009] The control box housing is in the shape of a rectangular parallelepiped, with a two-way switch mounted on the top, a parallel circuit connector mounted on one end of the bottom, and a series circuit connector mounted on the other end; a PDU power box is mounted in the control box, one end of the PDU power box is connected to the negative pole of the two-way switch through a cable; the other end of the PDU power box is divided into two paths, one of which is connected to the negative pole of the parallel circuit connector via the first total negative relay, and the other is connected to the negative pole of the series circuit connector via the second total negative relay; the positive pole of the two-way switch is divided into two paths, one of which is connected to the positive pole of the parallel circuit connector via the first fuse B and the first total positive relay, and the other is connected to the positive pole of the series circuit connector via the second fuse B and the second total positive relay; the battery control mainboard is connected to a DC conversion module, and the DC conversion module is respectively connected to the parallel circuit connector and the series circuit connector;

[0010] The battery pack is a module stacking structure, and the positive and negative poles of the connector on the parallel circuit and the positive and negative poles of the connector on the parallel circuit of another battery pack are connected in parallel with the positive and negative poles of the control box; the positive and negative poles of the control box are connected in series with the positive and negative poles of the battery pack.

[0011] Furthermore, there are at least two battery packs.

[0012] Furthermore, the connections are all cable connections.

[0013] The battery pack of the utility model adopts a module stacking structure, and the control circuit of the control box controls the series and parallel switching of the module stacked battery pack. When applied to high-voltage application scenarios, the control circuit switches to a series mode to increase the voltage of the household energy storage battery; when applied to low-voltage application scenarios, the control circuit switches to a parallel mode to meet the low-voltage application of the household energy storage battery. Without replacing the battery, it can take into account both high and low voltage application scenarios, which is economical, efficient and practical; and the control circuit performs autonomous switching, and no additional wiring operation is required, which is safe, convenient and highly operable. It solves the problem that low-voltage household energy storage battery technology cannot meet the needs of high-voltage application scenarios, and high-voltage household energy storage battery technology cannot meet the needs of low-voltage application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a structural diagram of the battery pack 1 in the utility model;

[0016] Figure 3 It is a structural diagram of the control box 2 in the utility model;

[0017] In the figure: 1-battery pack, 101-battery module, 102-first fuse A, 103-second fuse A, 104-battery control slave board, 105-parallel circuit upper connector, 106-series circuit upper connector, 107-series circuit lower connector, 108-parallel circuit lower connector.

[0018] 2-control box, 201-first total positive relay, 202-second total positive relay, 203-first total negative relay, 204-second total negative relay, 205-first fuse B, 206-second fuse B, 207-PDU power box, 208-battery control mainboard, 209-DC conversion module, 210-parallel circuit connector, 211-series circuit connector, 212-two-way switch. DETAILED DESCRIPTION

[0019] The present invention is further described below with reference to the accompanying drawings and embodiments. Figures 1 to 3 A household energy storage battery connection structure that takes into account both high and low voltage application scenarios includes a battery pack 1 in the form of a stacked module and a control box 2. Each battery pack 1 is provided with a positive electrode and a negative electrode at both ends. The positive and negative electrodes at one end of the adjacent battery pack 1 are connected in series with the positive and negative electrodes at the same end of the control box 2; the positive and negative electrodes at the other end of the adjacent battery pack 1 are connected in parallel with the positive and negative electrodes at the same end of the control box 2. The battery pack 1 is at least two (such as Figure 1 as shown).

[0020] The battery pack 1 has a rectangular outer shell, with a parallel circuit upper connector 105 mounted on one end and a parallel circuit lower connector 108 mounted on the lower end; a series circuit upper connector 106 mounted on the other end and a series circuit lower connector 107 mounted on the lower end; a battery module 101 is mounted in the battery pack 1, and the battery module 101 is composed of a plurality of battery blocks connected in series; the positive electrode of the battery module 101 is connected to the positive electrode of the series circuit upper connector 106, and is connected to the parallel circuit upper connector 105 and the parallel circuit lower connector 107 through the first fuse A102. The negative electrode of the battery module 101 is connected to the negative electrode of the upper connector 105 of the parallel circuit and the negative electrode of the lower connector 108 of the parallel circuit respectively, and is connected to the negative electrode of the lower connector 107 of the series circuit through the second fuse A103, and the negative electrode of the upper connector 106 of the series circuit is connected to the negative electrode of the lower connector 107 of the series circuit; the BMU battery control slave board 104 is connected to the upper connector 106 of the series circuit and the lower connector 107 of the series circuit respectively, and is also connected to the upper connector 105 of the parallel circuit and the lower connector 108 of the parallel circuit respectively (such as Figure 2 as shown).

[0021] The control box 2 has a rectangular outer shell with a two-way switch 212 on the top, a parallel circuit connector 210 on one end and a series circuit connector 211 on the other end; a PDU power box 207 is installed in the control box 2, one end of the PDU power box 207 is connected to the negative pole of the two-way switch 212 through a cable; the other end of the PDU power box 207 is divided into two paths, one of which is connected to the negative pole of the parallel circuit connector 210 through the first total negative relay 203, and the other is connected to the series circuit connector 211 through the second total negative relay 204. The positive pole of the two-way switch 212 is divided into two paths, one of which is connected to the positive pole of the parallel circuit connector 210 via the first fuse B205 and the first total positive relay 201, and the other is connected to the positive pole of the series circuit connector 211 via the second fuse B206 and the second total positive relay 202; the battery control mainboard 208 is connected to the DC conversion module 209, and the DC conversion module 209 is respectively connected to the parallel circuit connector 210 and the series circuit connector 211 (such as Figure 3 As shown); the above connections are all cable connections.

[0022] The battery pack 1 is a module stacking structure, and the positive and negative electrodes of the connector 105 on the parallel circuit and the positive and negative electrodes of the connector 105 on the parallel circuit of another battery pack 1 are connected in parallel with the positive and negative electrodes of the control box 2; the positive and negative electrodes of the control box 2 are connected in series with the positive and negative electrodes of the battery pack 1 (such as Figure 1 as shown).

[0023] In the present utility model: the battery module 101 model is: DJM-LFP-12.8V50Ah;

[0024] The specification of the first fuse A102 is: 400A;

[0025] The specification of the second fuse B103 is: 100A;

[0026] The model of the battery management unit 104 is: BMU-1 M723-36S;

[0027] The model of PDU power box 207 is: PEBS-H-63 MX500V C18mm;

[0028] The specifications of the first total positive relay 201 and the first total negative relay 202 are: YM EVHC400A-24S;

[0029] The specifications of the second total positive relay 203 and the second total negative relay 204 are: YM EVHC100A-24S.

[0030] In the control box 2 of the utility model, the BMS battery control mainboard 208 controls the 400A first total positive relay 201 and the 400A first total negative relay 203 to be energized, and at the same time controls the 100A second total positive relay 202 and the 100A second total negative relay 204 to be disconnected, closes the two switches 212 to connect the branches in parallel, and the PDU power box 207 energizes the parallel branch cables. At this time, a low-voltage application scenario can be realized, and the operating voltage range is 40V to 58.4V.

[0031] The BMS battery control mainboard 208 in the control box 2 controls the 100A second total positive relay 202 and the 100A second total negative relay 204 to be attracted, and at the same time controls the 400A first total positive relay 201 and the 400A first total negative relay 203 to be disconnected, closes the two switches 212 in series, and the PDU power box 207 energizes the series branch cable, and the high-voltage application scenario can be realized. When N battery packs 1 are connected in series, the operating voltage range is (40*N)V~(58.4*N)V.

[0032] The following are specific implementation examples of this utility model:

[0033] Embodiment 1: Four module stacked battery packs 1 are connected to the control box 2 through a cable to form a 204.8V50Ah 10.24kWh lithium iron phosphate high-voltage household energy storage battery; the BMS battery control mainboard 208 in the control box 2 controls the 100A second total positive relay 202 and the 100A second total negative relay 204 to be attracted, and at the same time controls the 400A first total positive relay 201 and the 400A first total negative relay 203 to be disconnected, and the two switches 212 are closed in series branches, and the PDU power box 207 energizes the series branch cables, and the working voltage range is 160V~233.6V. The four module stacked battery packs 1 are connected to the control box 2 through cables and connected in parallel to form a 51.2V 200Ah 10.24kWh lithium iron phosphate low-voltage household energy storage battery; the BMS battery control mainboard 208 in the control box 2 controls the 400A first total positive relay 201 and the 400A first total negative relay 203 to be attracted, and at the same time controls the 100A second total positive relay 202 and the 100A second total negative relay 204 to be disconnected, and the two switches 212 are closed to connect the parallel branches, and the PDU power box 207 energizes the parallel branch cables, and the working voltage range is 40V to 58.4V.

[0034] Embodiment 2: Three module stacked battery packs 1 are connected to the control box 2 through cables and connected in series to form a 153.6V 50Ah 7.68kWh lithium iron phosphate household high-voltage energy storage battery with an operating voltage range of 120V to 175.2V; three module stacked battery packs 1 are connected to the control box 2 through cables and connected in parallel to form a 51.2V 150Ah 7.68kWh lithium iron phosphate household low-voltage energy storage battery with an operating voltage range of 40V to 58.4V.

[0035] Embodiment 3: Two module stacked battery packs 1 are connected to the control box 2 via a cable and connected in series to form a 102.4V50Ah 5.12kWh lithium iron phosphate high-voltage household energy storage battery with an operating voltage range of 80V to 116.8V; two module stacked battery packs 1 are connected to the control box 2 via a cable and connected in parallel to form a 51.2V 100Ah 5.12kWh lithium iron phosphate low-voltage household energy storage battery with an operating voltage range of 40V to 58.4V.

Claims

1. A household energy storage battery connection structure that takes into account both high and low voltage application scenarios, comprising a battery pack (1) in the form of a stacked module and a control box (2), characterized in that: The battery pack (1) has a rectangular outer shell, with a parallel circuit upper connector (105) mounted above one end and a parallel circuit lower connector (108) mounted below the other end; a series circuit upper connector (106) mounted above the other end and a series circuit lower connector (107) mounted below the other end; a battery module (101) is mounted in the battery pack (1), the battery module (101) comprising a plurality of battery blocks connected in series; the positive electrode of the battery module (101) is connected to the positive electrode of the series circuit upper connector (106), and is connected to the parallel circuit upper connector (105) and the parallel circuit lower connector (107) via a first fuse A (102). The positive electrode of the plug-in (108); the negative electrode of the battery module (101) is respectively connected to the negative electrode of the upper connector (105) of the parallel circuit and the negative electrode of the lower connector (108) of the parallel circuit, and is also connected to the negative electrode of the lower connector (107) of the series circuit through the second fuse A (103); the negative electrode of the upper connector (106) of the series circuit is connected to the negative electrode of the lower connector (107) of the series circuit; the BMU battery control slave board (104) is respectively connected to the upper connector (106) of the series circuit and the lower connector (107) of the series circuit, and is also respectively connected to the upper connector (105) of the parallel circuit and the lower connector (108) of the parallel circuit; The control box (2) has a rectangular outer shell, with a two-way switch (212) mounted on the top, a parallel circuit connector (210) mounted on one end of the bottom, and a series circuit connector (211) mounted on the other end; a PDU power box (207) is mounted in the control box (2), one end of the PDU power box (207) is connected to the negative pole of the two-way switch (212) via a cable; the other end of the PDU power box (207) is divided into two paths, one of which is connected to the negative pole of the parallel circuit connector (210) via a first total negative relay (203), and the other is connected to the negative pole of the series circuit connector (211) via a second total negative relay (204). The positive pole of the two-way switch (212) is divided into two paths, one of which is connected to the positive pole of the parallel circuit connector (210) via the first fuse B (205) and the first total positive relay (201), and the other is connected to the positive pole of the series circuit connector (211) via the second fuse B (206) and the second total positive relay (202); the battery control mainboard (208) is connected to a DC conversion module (209), and the DC conversion module (209) is respectively connected to the parallel circuit connector (210) and the series circuit connector (211); The battery pack (1) is a module stacking structure, and the positive and negative electrodes of the connector (105) on the parallel circuit and the positive and negative electrodes of the connector (105) on the parallel circuit of another battery pack (1) are connected in parallel with the positive and negative electrodes of the control box (2); the positive and negative electrodes of the control box (2) are connected in series with the positive and negative electrodes of the battery pack (1).

2. According to claim 1, the household energy storage battery connection structure taking into account both high and low voltage application scenarios is characterized in that: There are at least two battery packs (1).

3. The household energy storage battery connection structure taking into account both high and low voltage application scenarios according to claim 1 is characterized in that: The connections described are all cable connections.

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