Battery, energy storage system, power station and charging network

Abstract

The invention provides a battery, an energy storage system, a power station and a charging network, and the battery comprises N battery packs and a control signal receiving unit, the control signal receiving unit is connected with each battery pack and a first interface of an external circuit system, and the N battery packs are connected in series to form a battery pack series circuit, the two ends of the battery pack series circuit are connected with a second interface and a third interface of the external circuit system respectively, and the control signal receiving unit controls the charge and discharge quantity corresponding to each battery pack according to a control signal after receiving the control signal sent by the external circuit system. The electric quantity of each battery pack in the battery pack series circuit is ensured to be different from the electric quantity of the adjacent battery packs connected in series, so that the electric quantity of the N battery packs is separated from each other, the battery pack with low electric quantity is used as a thermal runaway isolation belt, and thermal runaway diffusion can be avoided in time when thermal runaway occurs in part of the battery packs.

Description

Technical Field

[0001] This application relates to the field of energy technologies, and particularly to a battery, an energy storage system, a power station, and a charging network. Background Art

[0002] With the annual surge in social electricity consumption, the growth of renewable energy scale, and the continuous development of new business forms such as microgrids and new energy vehicle charging, a relatively large development space has emerged in the energy storage market. Currently, most energy storage systems use lithium iron phosphate systems or ternary systems. However, if lithium batteries are not properly managed, they may experience exhaust or overheating, and may even lead to thermal runaway of the lithium batteries.

[0003] Currently, the prior art improves the core material or the core manufacturing process of the battery. For example, the thermal stability of the core material is improved by wet coating the separator, solid electrolyte, composite current collector, etc. in the separator, or by coating ceramics on the edge of the electrode sheet and adding temperature sensors during the core manufacturing process. However, this method is complex to operate and cannot effectively prevent the thermal runaway of the battery from easily spreading to the surrounding batteries, ultimately leading to fire or explosion problems. Summary of the Invention

[0004] A battery, an energy storage system, a power station, and a charging network provided by the embodiments of this application reduce the probability of thermal runaway diffusion of battery packs in the battery.

[0005] In a first aspect, this application provides a battery, including: N battery packs and a control signal receiving unit; N is a positive integer greater than or equal to 2. The control signal receiving unit is respectively connected to each battery pack and the first interface of the external circuit system. The N battery packs are connected in series to form a battery pack series circuit. The two ends of the battery pack series circuit are respectively connected to the second interface and the third interface of the external circuit system. The control signal receiving unit is configured to receive a control signal sent by the external circuit system, and control the charge and discharge amount corresponding to each battery pack according to the control signal, so that the charge of each battery pack in the battery pack series circuit is different from that of the adjacent battery pack in series.

[0006] Compared with the prior art, this application controls the charge and discharge amount corresponding to each battery pack through the control signal receiving unit, ensures that the charge of each battery pack in the battery pack series circuit is different from that of the adjacent battery pack in series, realizes the high and low intervals of the charge of N battery packs. When the high-charge battery pack experiences thermal runaway, the low-charge battery pack can serve as a thermal runaway isolation zone for the high-charge battery pack, reducing the probability of thermal runaway diffusion of more battery packs in the battery.

[0007] In a possible embodiment of the present application, each battery pack includes: a battery module, a first switch, and a second switch; a first end of the battery module in any battery pack is connected to the first switch in the battery pack, a second end of the battery module in the battery pack is connected to the second switch in the battery pack, and the first switch in the battery pack is connected to the second switch in the battery pack; the second end of the battery module and the second switch in the first battery pack located at one end of the battery pack series circuit are respectively connected to the second interface of the external circuit system; the first switch and the second switch in the Nth battery pack located at the other end of the battery pack series circuit are respectively connected to the third interface of the external circuit system; the first switch and the second switch in the Pth battery pack are respectively connected to the second end of the battery module and the second switch in the adjacent (P + 1)th battery pack in series; P is any positive integer in N - 1; the control signal receiving unit is specifically configured to control, according to the control signal, the first switch in each battery pack to be turned on or off, and the second switch in each battery pack to be turned on or off, so that the power of each battery pack in the battery pack series circuit is different from that of the adjacent battery pack in series, and the power of the N battery packs is high-low spaced, and the battery pack with low power is used as a thermal runaway isolation zone to prevent the spread of thermal runaway in time when some battery packs have thermal runaway.

[0008] By setting the connection relationship between the battery module in each battery pack and the first switch and the second switch respectively, and setting the connection relationship between each battery pack, the control signal receiving unit can control the first switch and the second switch in each battery pack to be turned on or off, so as to ensure that the power of each battery pack in the battery pack series circuit is different from that of the adjacent battery pack in series, making the power of the N battery packs high-low spaced, and using the battery pack with low power as a thermal runaway isolation zone to prevent the spread of thermal runaway in time when some battery packs have thermal runaway.

[0009] In a possible embodiment of the present application, the N battery packs include a first battery pack set and a second battery pack set divided according to a preset interval division rule; the control signal receiving unit is specifically configured to: when the battery is in the charging process, control the first switch in each battery pack in the first battery pack set and the second battery pack set to be turned on and the second switch to be turned off; and when it is detected that the power of each battery pack in the second battery pack set exceeds the first preset power, control the first switch in each battery pack in the second battery pack set to be turned off and the second switch to be turned on; when the battery is in the discharging process, control the first switch in each battery pack in the first battery pack set and the second battery pack set to be turned on and the second switch to be turned off; and when it is detected that the power of each battery pack in the second battery pack set is lower than the second preset power, control the first switch in each battery pack in the second battery pack set to be turned off and the second switch to be turned on.

[0010] In this application, during different processes of charging and discharging the battery, according to the power of each battery pack in the second battery pack set, the conduction or cutoff of the first switch and the second switch of each battery pack in the second battery pack set is controlled, so that the battery packs in the second battery pack set can serve as a thermal runaway isolation zone for the corresponding battery packs in the first battery pack set, enabling timely prevention of the spread of thermal runaway when some battery packs experience thermal runaway.

[0011] In a possible embodiment of this application, the preset interval division rule is to divide according to the odd and even positions of each battery pack in the battery pack series circuit. The first battery pack set includes the battery packs in the odd positions in the battery pack series circuit; the second battery pack set includes the battery packs in the even positions in the battery pack series circuit.

[0012] By setting different preset interval division rules in this application, various composition methods of the first battery pack set and the second battery pack set can be obtained. Through the setting of the preset interval division rule, it can be ensured that the battery packs in the second battery pack set can serve as a thermal runaway isolation zone for the corresponding battery packs in the first battery pack set, enabling timely prevention of the spread of thermal runaway when some battery packs experience thermal runaway.

[0013] In a possible embodiment of this application, when there are multiple battery cells in each battery pack, the battery cells are connected in series with each other, and multiple battery cells share a liquid cooling plate, and a heat exchange medium is provided in the liquid cooling plate. By providing a liquid cooling plate for multiple battery cells in each battery pack and providing a heat exchange medium in the liquid cooling plate, each battery pack can dissipate heat through the heat exchange medium under different power conditions, avoiding the occurrence of thermal runaway.

[0014] In a second aspect, this application provides an energy storage system, including: M battery clusters and a power distribution module, where M is a positive integer greater than or equal to 2; each battery cluster is connected in parallel; the power distribution module is connected to each battery cluster; each battery cluster includes the battery as described in any one of the first aspects; the power distribution module is configured to perform power distribution on the batteries in each battery cluster, so that the power of each battery cluster in the M battery clusters is different from that of the adjacent battery clusters in the parallel connection link.

[0015] In this application, different power distributions are performed on the batteries in each battery cluster through the power distribution module, ensuring that the power of each battery cluster in the M battery clusters is different from that of the adjacent battery clusters in the parallel connection link. Furthermore, the power of each battery cluster in the M battery clusters is different from that of the adjacent battery clusters in the parallel connection link, and the battery clusters with low power and low power are used as thermal runaway isolation zones, enabling timely prevention of the spread of thermal runaway when the battery clusters with high power and high power experience thermal runaway.

[0016] Alternatively, by ensuring that the power of each battery pack in the series circuit of the battery pack is different from that of the adjacent battery packs in series, the power of the N battery packs can be made to have high and low intervals. The battery packs with low power are used as thermal runaway isolation zones, so that when some battery packs experience thermal runaway, the spread of thermal runaway can be avoided in time, further reducing the problem of thermal runaway in each battery cluster.

[0017] In a third aspect, the present application provides an energy storage system, including: an inverter, a DC-DC converter, and the battery according to any one of the first aspects. The inverter is electrically connected to the N battery packs in the battery through the DC-DC converter, and is configured to convert alternating current into direct current and supply it to the N battery packs, or convert the direct current from the N battery packs into alternating current. By applying the above-mentioned battery pack, the power density of the energy storage system can be effectively improved, and it has the advantages of being easy to deploy and having high safety.

[0018] In a fourth aspect, the present application provides a power station, including: a power generation device and the battery according to any one of the first aspects. The power generation device is electrically connected to the N battery packs in the battery, and the power generation device is configured to store the generated electric energy into the N battery packs. By applying the above-mentioned battery pack, the safety and deployment difficulty of the power station can be effectively improved.

[0019] In a fifth aspect, the present application provides a charging network, including: a charging pile and the battery according to any one of the first aspects. The charging pile is electrically connected to the N battery packs in the battery, and the N battery packs are configured to supply electric energy to the charging pile, so as to replenish energy to the power receiving device. By applying the above-mentioned battery pack, the safety of the charging network can be effectively improved, and it is also helpful to improve the flexibility of the charging network during deployment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an application scenario of a battery provided by an embodiment of the present application;

[0021] Figure 2 It is a schematic diagram of the structure of a battery provided by an embodiment of the present application;

[0022] Figure 3 It is a schematic diagram of the connection structure of multiple battery packs provided by an embodiment of the present application;

[0023] Figure 4 It is a schematic diagram of the structure of an energy storage system provided by an embodiment of the present application;

[0024] Figure 5 It is a schematic diagram of the structure of an energy storage system provided by an embodiment of the present application;

[0025] Figure 6A schematic structural diagram of a power station provided by an embodiment of the present application;

[0026] Figure 7 A schematic structural diagram of a charging network provided by an embodiment of the present application. Detailed implementation manners

[0027] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0028] In various embodiments of the present application, if there is no special description and logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0029] In the present application, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural.

[0030] It can be understood that in the embodiments of the present application, the various numerical numbers involved are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the serial numbers of the above processes does not mean the sequence of execution, and the execution sequence of each process should be determined according to its function and internal logic.

[0031] As Figure 1 shown, in an embodiment of the present application, a battery is provided, including: N battery packs (such as Figure 1 the first battery pack 101-1, the second battery pack 101-2,..., the Nth battery pack 101-N shown in

[0032] Here, the first interface 103 of the external circuit system may be a control interface of the controller 106. The second interface 104 and the third interface 105 of the external circuit system may be two interfaces of the direct current-direct current (DC-DC) converter 107. The external circuit system may further include: a power conversion system (PCS) 108 and a power grid / Ethernet 109. The PCS 108 is respectively connected to the DC-DC converter 107 and the power grid / Ethernet 109. Here, only an example is given to illustrate the composition of the external circuit system architecture, and the external circuit system architecture can be adjusted according to actual situations.

[0033] The external circuit system sends a control signal to the control signal receiving unit 102 through the first interface 103. After the control signal receiving unit 102 receives the control signal sent by the external circuit system through the first interface 103 of the external circuit system, the control signal receiving unit 102 controls the charge and discharge amount corresponding to each battery pack to make the power of each battery pack in the battery pack series circuit different from that of the adjacent battery pack in series.

[0034] Optionally, each battery pack includes: a battery module, a first switch, and a second switch. The first end of the battery module in any battery pack is connected to the first switch in the battery pack, the second end of the battery module in the battery pack is connected to the second switch in the battery pack, and the first switch and the second switch in the battery pack are connected. The battery module may include devices such as battery cells and cables, and the specific structure of the battery module is not limited herein. Here, the first end of the battery module may be the negative electrode of the battery cell in the battery module, and the second end of the battery module may be the positive electrode of the battery cell in the battery module. Or, the first end of the battery module may be the positive electrode of the battery cell in the battery module, and the second end of the battery module may be the negative electrode of the battery cell in the battery module. Here, only an example is given, and the present application does not limit the ports of the specific devices corresponding to the first end and the second end of the battery module.

[0035] Exemplarily, as Figure 2 shown, the first battery pack 101-1 includes: a battery module 1, a first switch 1, and a second switch 1. The first end of the battery module 1 is connected to the first switch 1, the second end of the battery module 1 is connected to the second switch 1, and the first switch 1 and the second switch 1 are connected.

[0036] Similarly, the second battery pack 101-2 includes: a battery module 2, a first switch 2, and a second switch 2. The first end of the battery module 2 is connected to the first switch 2, the second end of the battery module 2 is connected to the second switch 2, and the first switch 2 and the second switch 2 are connected. The Nth battery pack 101-N includes: a battery module N, a first switch N, and a second switch N. The first end of the battery module N is connected to the first switch N, the second end of the battery module N is connected to the second switch N, and the first switch N and the second switch N are connected.

[0037] The second end of the battery module 1 in the first battery pack 101-1 at one end of the battery pack series circuit and the second switch 1 are respectively connected to the second interface 104 of the external circuit system. The first switch N and the second switch N in the Nth battery pack 101-N at the other end of the battery pack series circuit are respectively connected to the third interface 105 of the external circuit system. The first switch and the second switch in the Pth battery pack are respectively connected to the second end of the battery module and the second switch in the (P + 1)th battery pack adjacent in series, where P is any positive integer in N - 1. For example, the first switch 1 and the second switch 1 in the first battery pack 101-1 are respectively connected to the second end of the battery module 2 and the second switch 2 in the second battery pack 101-2 adjacent in series. It should be noted that here is only an example to illustrate that one end of the battery pack series circuit is the first battery pack 101-1 and the other end is the Nth battery pack 101-N. In the actual application process, the specific positions of the first battery pack 101-1 and the Nth battery pack 101-N in the battery pack series circuit can be determined according to the specific connection method.

[0038] A possible implementation is that the control signal receiving unit 102 controls the first switch in each battery pack to be turned on or off according to the control signal, and controls the second switch to be turned on or off, so that the power of each battery pack in the battery pack series circuit is different from that of the adjacent battery pack in series. Assuming that the N battery packs include a first battery pack set and a second battery pack set divided according to a preset interval division rule, then during the charging process of the battery, the control signal receiving unit 102 controls the first switch in each battery pack in the first battery pack set and the second battery pack set to be turned on and the second switch to be turned off. When the control signal receiving unit 102 detects that the power of each battery pack in the second battery pack set exceeds the first preset power, it controls the first switch in each battery pack in the second battery pack set to be turned off and the second switch to be turned on.

[0039] For example, assume Figure 2Among them, the first battery pack 101-1 is a battery pack in the first battery pack set, and the second battery pack 101-2 is a battery pack in the second battery pack set. When the battery is in the charging process, the control signal receiving unit 102 controls the first switch 1 in the first battery pack 101-1 to be turned on and the second switch 1 to be turned off, and controls the first switch 2 in the second battery pack 101-2 to be turned on and the second switch 2 to be turned off. Thus, the first battery pack 101-1 and the second battery pack 101-2 can be charged by using an external circuit system. When the control signal receiving unit 102 detects that the power of the second battery pack exceeds the first preset power, the control signal receiving unit 102 controls the first switch 2 in the second battery pack 101-2 to be turned off and the second switch 2 to be turned on, so as to stop charging the second battery pack 101-2 by the external circuit system and enable the external circuit system to continue charging the first battery pack 101-1. Here, the specific value of the first preset power is not limited and can be adjusted according to the actual situation.

[0040] In a possible implementation manner, the preset interval division rule is to divide according to the odd and even positions of each battery pack in the battery pack series circuit. The first battery pack set includes the battery packs in the odd positions in the battery pack series circuit, and the second battery pack set includes the battery packs in the even positions in the battery pack series circuit. Here, only one case of the preset interval division rule is illustrated, and it can be specifically adjusted according to the actual situation.

[0041] As Figure 3 shown, assuming that the battery includes 18 battery packs and each battery pack is connected in series, the first battery pack set includes: the first battery pack, the third battery pack, the fifth battery pack, the seventh battery pack, the ninth battery pack, the eleventh battery pack, the thirteenth battery pack, the fifteenth battery pack, the seventeenth battery pack, and the second battery pack set includes: the second battery pack, the fourth battery pack, the sixth battery pack, the eighth battery pack, the tenth battery pack, the twelfth battery pack, the fourteenth battery pack, the sixteenth battery pack, the eighteenth battery pack. According to the above charging control method for each battery pack in the first battery pack set and the second battery pack set, the available power (which can also be called the remaining power, represented by SOC, full name: state of charge) in the first battery pack, the third battery pack, the fifth battery pack, the seventh battery pack, the ninth battery pack, the eleventh battery pack, the thirteenth battery pack, the fifteenth battery pack, and the seventeenth battery pack is the same, and is all power A; the SOC in the second battery pack, the fourth battery pack, the sixth battery pack, the eighth battery pack, the tenth battery pack, the twelfth battery pack, the fourteenth battery pack, the sixteenth battery pack, and the eighteenth battery pack is the same, and is all the first preset power. Here, the first preset power can be 40% of power A.

[0042] Based on the power of each battery pack in the first battery pack set and the second battery pack set, the control signal receiving unit 102 can use each battery pack in the second battery pack set as a thermal runaway isolation zone for the corresponding battery pack in the first battery pack set. When the power of a certain battery pack in the first battery pack set is too high and causes thermal runaway, the control signal receiving unit 102 can control the corresponding adjacent low-power battery pack in the second battery pack set as the thermal runaway isolation zone to prevent more battery packs from experiencing thermal runaway.

[0043] Similarly, when the battery is in the discharge process, the control signal receiving unit 102 controls the first switch of each battery pack in the first battery pack set and the second battery pack set to be turned on and the second switch to be turned off. When the control signal receiving unit 102 detects that the power of each battery pack in the second battery pack set is lower than the second preset power, it controls the first switch of each battery pack in the second battery pack set to be turned off and the second switch to be turned on.

[0044] Continuing with the above example for illustration, assume Figure 2 that the first battery pack 101-1 is a battery pack in the first battery pack set, and the second battery pack 101-2 is a battery pack in the second battery pack set. When the battery is in the discharge process, the control signal receiving unit 102 controls the first switch 1 in the first battery pack 101-1 to be turned on and the second switch 1 to be turned off, and controls the first switch 2 in the second battery pack 101-2 to be turned on and the second switch 2 to be turned off, so that the first battery pack 101-1 and the second battery pack 101-2 can be used to charge the external circuit system. When the control signal receiving unit 102 detects that the power of the second battery pack is lower than the second preset power, the control signal receiving unit 102 controls the first switch 2 in the second battery pack 101-2 to be turned off and the second switch 2 to be turned on, so as to stop the second battery pack 101-2 from charging the external circuit system and enable the first battery pack 101-1 to continue charging the external circuit system. The specific value of the second preset power is not limited here and can be adjusted according to the actual situation.

[0045] In a possible implementation, the number of battery cells in each battery pack can be multiple. Each battery cell is connected in series with each other, and multiple battery cells can share a liquid cooling plate. A heat transfer medium is provided in the liquid cooling plate, thereby reducing the probability of thermal runaway of the battery pack by using the heat transfer medium. The present application can also prevent short-circuit phenomena and avoid thermal runaway by improving the insulation between battery cells and between battery cells and structural components. In addition, the present application can enhance the heat insulation between battery cells through aerogel, fireproof cotton, fireproof blanket, etc., and improve the heat dissipation capacity through liquid cooling, explosion-proof valves, etc. to avoid thermal runaway. Thermal runaway can also be warned by detecting voltage, temperature, current, resistance, gas sensors, etc. Or thermal runaway can also be warned by means such as fuse protection, exhaust (smoke isolation and directional smoke exhaust), aerosol fire extinguishing for electrical fires, perfluoromethylcyclohexane / heptafluoropropane gas fire extinguishing, water spray, smoke sensor, sound and light alarm, etc.

[0046] As Figure 4 shown, the present application also provides an energy storage system, including: M battery clusters (such as Figure 4 the first battery cluster 401-1, the second battery cluster 401-2,..., the Mth battery cluster 401-M shown in

[0047] ), and a power distribution module 402, where M is a positive integer greater than or equal to 2. The first battery cluster 401-1, the second battery cluster 401-2,..., the Mth battery cluster 401-M are connected in parallel, and the power distribution module 402 is respectively connected to the first battery cluster 401-1, the second battery cluster 401-2,..., the Mth battery cluster 401-M. Here, the battery cluster can also be represented by a battery cabinet.

[0048] For example, assume that the charging power of the power distribution module 402 is 240 KW, and it is necessary to charge four battery clusters. The charging powers preset for battery cluster 1 and battery cluster 3 by the power distribution module 402 are 100 KW respectively, and the charging powers preset for battery cluster 2 and battery cluster 4 are 20 KW respectively. Battery cluster 1, battery cluster 2, battery cluster 3, and battery cluster 4 are connected in parallel in sequence. Therefore, after the power distribution module 402 charges battery cluster 1 and battery cluster 3 respectively, the SOC of both battery cluster 1 and battery cluster 3 is battery level B. After the power distribution module 402 charges battery cluster 2 and battery cluster 4 respectively, the SOC of both battery cluster 2 and battery cluster 4 is battery level C, where battery level B is 5 times that of battery level C.

[0049] In this way, when a high - power battery cluster 1 experiences thermal runaway, the low - power battery cluster 2 can serve as a thermal runaway isolation zone between the high - power battery cluster 1 and the high - power battery cluster 3, reducing the probability of thermal runaway occurring in the high - power battery cluster 3. When the high - power battery cluster 3 experiences thermal runaway, the low - power battery cluster 2 can serve as a thermal runaway isolation zone between the high - power battery cluster 1 and the high - power battery cluster 3, reducing the probability of thermal runaway occurring in the high - power battery cluster 1. At the same time, the low - power battery cluster 4 can serve as a thermal runaway isolation zone between the high - power battery cluster 3 and other devices, reducing the probability of thermal runaway occurring in other devices.

[0050] In a possible implementation, each battery cluster may include any of the possible batteries described in the above embodiments. By ensuring that the power levels of each battery pack in the battery pack series circuit are different from those of the adjacent series - connected battery packs, the power levels of the N battery packs are arranged in a high - low interval. Using the low - power battery packs as thermal runaway isolation zones can prevent the spread of thermal runaway in a timely manner when some battery packs experience thermal runaway, further reducing the problem of thermal runaway occurring in each battery cluster.

[0051] In practical applications, the batteries in any of the above embodiments can be applied in scenarios such as home energy storage, industrial energy storage, data centers, vehicles, etc., for storing and releasing electrical energy. Exemplarily, they can be applied in scenarios such as home user energy storage cabinets, industrial and commercial energy storage cabinets, and large - scale ground power station containers.

[0052] As Figure 5 shown, an embodiment of the present application also provides an energy storage system, which may include an inverter 501, a DC - DC converter 502, and a battery 503. The inverter 501 is electrically connected to N battery packs in the battery 503 through the DC - DC converter 502, and is used to convert alternating current into direct current and supply it to the N battery packs, or convert the direct current from the N battery packs into alternating current. Here, when the first switch and the second switch in Figure 2 are not included in the battery 503, the inverter 501 can be directly electrically connected to the N battery packs in the battery 503.

[0053] In addition, in the energy storage system, a battery management system 504 may also be included. The battery management system 504 can effectively detect parameters such as the temperature, state of charge, and health state of each battery pack, and can also effectively regulate the charge and discharge functions of each battery pack, so as to ensure the normal operation of the energy storage device.

[0054] As Figure 6 shown, in an embodiment of the present application, a power station is also provided, which may include a power generation device 601 and a battery 602. The power generation device 601 is electrically connected to N battery packs in the battery 602, and the power generation device 601 is used to store the generated electric energy into the N battery packs. By applying the above-mentioned battery packs, the safety and deployment difficulty of the power station can be effectively improved.

[0055] In specific applications, the power generation device 601 may be a photovoltaic power generation device, a wind power generation device, etc., and the present application does not limit the specific type of the power generation device. In addition, in actual applications, the power generation device 601 and each battery pack may also be connected through a power distribution cabinet 603. The power distribution cabinet 603 may include a direct current - alternating current conversion device, or may also include devices such as a transformer, so as to effectively transmit the electric energy generated by the power generation device 601 to the corresponding battery pack for storage. When specifically setting, the quantity and type of devices in the power distribution cabinet can be reasonably set according to actual needs, and the present application does not limit this.

[0056] As Figure 7 shown, in an embodiment of the present application, a charging network is also provided, including a charging pile 701 and a battery 702. The charging pile 701 is electrically connected to N battery packs in the battery 702 through a cable, and the N battery packs can provide the electric energy stored in themselves to the charging pile 701. The charging pile 701 has a connector 703, and the connector 703 can be connected to a power receiving device (such as a vehicle), so as to replenish energy to the power receiving device. By applying the battery packs in the above-mentioned battery 702, the safety of the charging network can be effectively improved, and it is also helpful to improve the flexibility of the charging network during deployment.

[0057] When specifically setting, the charging network may include multiple charging piles, and each battery pack can provide electric energy to multiple charging piles, so as to effectively improve the flexibility of deployment.

[0058] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery, characterized in that: include: N battery packs and a control signal receiving unit; N is a positive integer greater than or equal to 2, the control signal receiving unit is connected to each battery pack and the first interface of the external circuit system respectively; the N battery packs are connected in series to form a battery pack series circuit, and the two ends of the battery pack series circuit are connected to the second interface and the third interface of the external circuit system respectively; The control signal receiving unit is used to receive the control signal sent by the external circuit system; and control the charge and discharge amount corresponding to each battery pack according to the control signal, so that the power of each battery pack in the battery pack series circuit is different from that of the adjacent battery packs in series.

2. The battery according to claim 1, characterized in that Each battery pack includes: a battery module, a first switch and a second switch; A first end of a battery module in any battery pack is connected to a first switch in the battery pack, a second end of a battery module in the battery pack is connected to a second switch in the battery pack, and the first switch in the battery pack is connected to the second switch in the battery pack; A second end of a battery module in a first battery pack located at one end of the battery pack series circuit and a second switch are respectively connected to a second interface of the external circuit system; The first switch and the second switch in the Nth battery pack located at the other end of the battery pack series circuit are respectively connected to the third interface of the external circuit system; The first switch and the second switch in the Pth battery pack are respectively connected to the second end and the second switch of the battery module in the P+1th battery pack adjacent in series; P is any positive integer in N-1; The control signal receiving unit is specifically used to control the first switch in each battery pack to be turned on or off, and the second switch to be turned on or off according to the control signal, so that the power of each battery pack in the battery pack series circuit is different from that of the adjacent battery packs in series.

3. The battery according to claim 2, characterized in that The N battery packs include a first battery pack set and a second battery pack set divided according to a preset interval rule; The control signal receiving unit is specifically used to: when the battery is in the charging process, control the first switch of each battery pack in the first battery pack set and the second battery pack set to be turned on and the second switch to be turned off; When it is detected that the power of each battery pack in the second battery pack set exceeds the first preset power, the first switch of each battery pack in the second battery pack set is controlled to be turned off and the second switch is controlled to be turned on; When the battery is in the discharge process, controlling the first switch of each battery pack in the first battery pack set and the second battery pack set to be turned on and the second switch to be turned off; When it is detected that the power level of each battery pack in the second battery pack set is lower than the second preset power level, the first switch of each battery pack in the second battery pack set is controlled to be turned off and the second switch is controlled to be turned on.

4. The battery according to claim 3, characterized in that The preset interval division rule is to divide each battery pack according to the odd position and the even position in the battery pack series circuit. The first battery pack set includes the battery packs in the odd positions in the battery pack series circuit; the second battery pack set includes the battery packs in the even positions in the battery pack series circuit.

5. The battery according to any one of claims 2 to 4, characterized in that: When there are multiple battery cells in each battery pack, each battery cell is connected in series, and multiple battery cells share a liquid cooling plate, in which a heat exchange medium is arranged.

6. An energy storage system, characterized in that: include: M battery clusters and a power distribution module, M is a positive integer greater than or equal to 2; each battery cluster is connected in parallel; the power distribution module is connected to each battery cluster; each battery cluster includes a battery as described in any one of claims 1 to 5; The power distribution module is used to distribute power to the batteries in each battery cluster so that the power of each battery cluster in the M battery clusters is different from that of the battery clusters adjacent to each other in the parallel connection link.

7. An energy storage system, characterized in that: include: An inverter, a DC-to-DC converter, and a battery as described in any one of claims 1 to 5, wherein the inverter is electrically connected to N battery packs in the battery through the DC-to-DC converter, and is used to convert AC power into DC power and then provide it to the N battery packs, or to convert DC power from the N battery packs into AC power.

8. A power station, characterized in that: include: A power generation device and a battery as described in any one of claims 1 to 5, wherein the power generation device is electrically connected to N battery packs in the battery, and the power generation device is used to store the generated electrical energy in the N battery packs.

9. A charging network, characterized in that: include: A charging pile and a battery as described in any one of claims 1 to 5, wherein the charging pile is electrically connected to N battery packs in the battery, and the N battery packs are used to provide electrical energy to the charging pile.

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