Battery pack and energy storage battery system

Abstract

The invention provides a battery pack and an energy storage battery system, and relates to the technical field of energy storage batteries. The battery management compatible module is connected with the battery cell module; the first contact module is connected with the battery management compatible module; the battery cell module, the battery management compatible module and the first contact module are all arranged in the shell, a first knob is arranged outside the shell, the first knob is connected with the first contact module, and the first knob is used for adjusting the connection relation among contacts in the first contact module. And determining a target connection mode corresponding to the battery pack. According to the invention, the framework unification of the battery pack structure and the battery management system in the battery system can be realized, and the universality of the battery system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage batteries, and in particular to a battery pack and an energy storage battery system. Background Art

[0002] As the installed capacity of household energy storage products increases year by year, the limitations of the fixed form of traditional energy storage products are gradually revealed. At present, energy storage battery systems are mainly divided into low-voltage systems and high-voltage systems, which need to be used with inverters of different specifications, including:

[0003] 1) In a low-voltage battery system, multiple battery packs are connected in parallel, and each battery pack includes an independent battery management system (BMS). The low-voltage battery system has low voltage, high current and high circuit cost.

[0004] 2) In the high-voltage battery system, multiple battery packs are connected in series, and each battery pack is connected to a battery sampling unit (CSU). Each battery sampling unit and the battery cluster unit (BCU) form a two-level battery management system. The high-voltage battery system has high voltage and low current, and has high consistency requirements for the battery pack.

[0005] From the above, it can be seen that different battery systems have different requirements on the structure of the battery pack and different connection methods of the battery pack, which leads to low universality of the battery system and limits the application scenarios of the battery system. Summary of the invention

[0006] The present invention provides a battery pack and an energy storage battery system to solve the defect of low universality of the battery system in the prior art, unify the architecture of the battery pack structure and the battery management system in the battery system, and improve the universality of the battery system.

[0007] The present invention provides a battery pack, comprising:

[0008] Battery cell module;

[0009] A battery management compatible module, the battery management compatible module is connected to the battery cell module;

[0010] A first contact module, the first contact module being connected to the battery management compatible module;

[0011] The battery cell module, the battery management compatible module and the first contact module are all arranged in the shell, and a first knob is arranged outside the shell, the first knob is connected to the first contact module, and the first knob is used to adjust the connection relationship between the contacts in the first contact module to determine the target connection mode corresponding to the battery pack.

[0012] According to the battery pack provided by the present invention, the first contact module includes: a first contact, a second contact, a third contact and a fourth contact, wherein:

[0013] The first contact is connected to the first input end of the battery management compatible module and the first quick-plug end of the battery pack, the second contact is connected to the second input end of the battery management compatible module, the first quick-plug end and the second quick-plug end of the battery pack, the third contact is connected to the second quick-plug end, and the fourth contact is connected to the third input end of the battery management compatible module.

[0014] According to the battery pack provided by the present invention,

[0015] When the first knob is rotated to connect the third contact and the fourth contact, the target connection mode corresponding to the battery pack is a series connection mode;

[0016] When the first knob is rotated to connect the first contact and the third contact, and the second contact and the fourth contact, the target connection mode corresponding to the battery pack is a parallel connection mode.

[0017] According to the battery pack provided by the present invention, the battery management compatible module includes: a voltage sampling circuit, a micro control unit and a step-down circuit, wherein:

[0018] The first end of the voltage sampling circuit is connected to the micro control unit and the fourth end of the step-down circuit, and the first end of the voltage sampling circuit serves as the first input end of the battery management compatible module, the second end of the voltage sampling circuit serves as the second input end of the battery management compatible module, the third end of the voltage sampling circuit is connected to the first end of the step-down circuit, the third end of the voltage sampling circuit serves as the third input end of the battery management compatible module, and the fourth end of the voltage sampling circuit is connected to the micro control unit; the voltage sampling circuit is used to collect the sampled voltage between the second contact and the fourth contact, and transmit it to the micro control unit;

[0019] The microcontroller unit is connected to the second end and the third end of the step-down circuit. The microcontroller unit is used to collect a sampling current between the third end of the step-down circuit and the positive electrode of the battery module, and perform charge and discharge control based on the sampling current; and based on the sampling voltage, determine the corresponding warning result when the battery pack is adjusted from a series connection mode to a parallel connection mode.

[0020] According to the battery pack provided by the present invention, the micro control unit is specifically used for:

[0021] Obtaining a cell module voltage corresponding to the cell module;

[0022] Determine a voltage difference between the sampled voltage and the cell module voltage;

[0023] When the voltage difference is greater than or equal to a preset threshold, determining that the warning result corresponding to the battery pack being adjusted from the series connection mode to the parallel connection mode is that adjustment is prohibited;

[0024] When the voltage difference is less than the preset threshold, it is determined that the corresponding warning result when the battery pack is adjusted from the series connection mode to the parallel connection mode is that the adjustment is allowed.

[0025] According to the battery pack provided by the present invention, the voltage sampling circuit includes a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein:

[0026] One end of the resistor R1 serves as the third end of the voltage sampling circuit, the other end of the resistor R1 is connected to one end of the resistor R2 and one end of the resistor R3, the other end of the resistor R2 serves as the second end of the voltage sampling circuit, the other end of the resistor R3 is connected to one end of the resistor R4, and the other end of the resistor R3 serves as the fourth end of the voltage sampling circuit, and the other end of the resistor R4 serves as the first end of the voltage sampling circuit.

[0027] According to the battery pack provided by the present invention, the step-down circuit includes a MOS tube, an inductor L1 and a diode D1, wherein:

[0028] The gate of the MOS tube serves as the second end of the step-down circuit, the drain of the MOS tube serves as the first end of the step-down circuit, the source of the MOS tube is connected to one end of the inductor L1 and the cathode of the diode D1, the other end of the inductor L1 serves as the third end of the step-down circuit, and the anode of the diode D1 serves as the fourth end of the step-down circuit.

[0029] The present invention also provides an energy storage battery system, comprising: at least one battery module and a base, wherein:

[0030] Each of the battery modules comprises at least two battery packs as described in any one of the above items, the battery packs are plugged into each other, and the battery pack at the bottom is plugged into the base;

[0031] A second contact module and a second knob are provided on the base, the second knob is connected to the second contact module, and the second knob is used to adjust the connection relationship between the contacts in the second contact module based on the target connection mode corresponding to each battery pack in the battery module.

[0032] According to the energy storage battery system provided by the present invention, the second contact module includes: a fifth contact and a sixth contact, wherein:

[0033] When the target connection mode corresponding to each battery pack in the battery module is a series connection mode, the second knob is rotated until the fifth contact is connected to the sixth contact;

[0034] When the target connection mode corresponding to each battery pack in the battery module is a parallel connection mode, the second knob is rotated until the fifth contact and the sixth contact are disconnected.

[0035] The energy storage battery system provided by the present invention further includes: an energy storage converter and a battery cluster management unit, wherein:

[0036] The energy storage converter is connected to the battery cluster management unit, and the battery cluster management unit is connected to the battery management compatible modules in each of the battery packs via a bus.

[0037] The battery pack and energy storage battery system provided by the present invention are configured with a battery management compatible module, a first contact and a shell in the battery pack, and the connection relationship between the contacts in the first contact module is adjusted by rotating the first knob on the shell to adjust the target connection mode corresponding to the battery pack, unify the structure of each battery pack and the architecture of the battery management compatible module, improve the universal adaptability of the battery pack and the battery system composed of the battery packs, and enable the battery system to meet the needs of different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a structural schematic diagram of a low-voltage battery system provided by the prior art;

[0040] Figure 2 It is a structural schematic diagram of a high-voltage battery system provided by the prior art;

[0041] Figure 3 It is one of the structural schematic diagrams of the battery pack provided by the embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of a first knob provided by an embodiment of the present invention;

[0043] Figure 5 This is the second structural schematic diagram of the battery pack provided by the embodiment of the present invention;

[0044] Figure 6This is the third structural schematic diagram of the battery pack provided by the embodiment of the present invention;

[0045] Figure 7 is a schematic structural diagram of a battery module in parallel connection mode provided by an embodiment of the present invention;

[0046] Figure 8 is a schematic diagram of the structure of a battery management compatible module provided by an embodiment of the present invention;

[0047] Fig. 9 is a schematic diagram of a second knob provided by an embodiment of the present invention;

[0048] Fig.10 It is a schematic diagram of the structure of the energy storage battery system provided by an embodiment of the present invention.

[0049] Reference numerals:

[0050] 110: battery cell module; 120: battery management compatible module; 121: voltage sampling circuit; 122: micro control unit; 123: step-down circuit; 130: first contact module; 140: housing; 200: energy storage battery system; 210: battery module; 220: battery cluster management unit; 230: energy storage converter; 240: base. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In the prior art, the energy storage battery system 200 generally includes a low-voltage battery system and a high-voltage battery system, wherein:

[0053] 1) Figure 1 It is a structural schematic diagram of a low-voltage battery system provided by the prior art, such as Figure 1 As shown, the voltage range of the low-voltage battery system is 40-60V. Each battery pack is equipped with an independent battery management system (BMS), and the low-voltage battery system is formed by connecting the battery packs in parallel. The system current of the low-voltage battery system is large, and the circuit cost and loss are relatively large. At the same time, due to the differences in battery cells, battery packs and cables, the battery packs with high internal resistance have a small charge and discharge current, while the battery packs with low internal resistance have a large charge and discharge current, resulting in some battery packs being unable to be fully charged / fully discharged for a long time, resulting in partial capacity loss of the low-voltage battery system.

[0054] 2) Figure 2 It is a structural schematic diagram of a high-voltage battery system provided by the prior art, such as Figure 2 As shown, the voltage range of the high-voltage battery system is 85-600V. Each battery pack is provided with a cell sampling unit (CSU) for collecting battery information, and the battery information is transmitted to the battery cluster unit 220 (BCU). The BCU controls the charging and discharging of each battery pack. Each CSU and BCU constitute a battery management system with a two-level architecture. In the high-voltage battery system, multiple battery packs are connected in series to achieve capacity expansion. At the same time, the batches of each battery pack in the high-voltage battery system must be the same, which means that each battery pack in the high-voltage battery system must be strictly batch managed, and different batches cannot be mixed, resulting in cumbersome charging of a single battery pack in the high-voltage battery system. In addition, according to the characteristics of the series circuit, the charging and discharging currents of the battery packs in the high-voltage battery system are consistent. However, due to the differences in the capacity of each battery pack, the battery pack with a smaller capacity is filled or discharged first, resulting in some battery packs being unable to be filled or discharged for a long time, which in turn leads to partial capacity loss of the battery module 210 in the high-voltage battery system.

[0055] In view of the problem that different battery systems in the prior art have different structural requirements for battery packs and different connection methods for battery packs, resulting in low universality of battery systems, the present invention provides a battery pack. Figure 3 is one of the structural schematic diagrams of the battery pack provided by the embodiment of the present invention, such as Figure 3 As shown, the battery pack includes:

[0056] Battery cell module 110;

[0057] A battery management compatible module 120, wherein the battery management compatible module 120 is connected to the battery cell module 110;

[0058] A first contact module 130, wherein the first contact module 130 is connected to the battery management compatible module 120;

[0059] The shell 140, the battery cell module 110, the battery management compatible module 120 and the first contact module 130 are all arranged in the shell 140, and the first knob is arranged outside the shell 140, the first knob is connected to the first contact module 130, and the first knob is used to adjust the connection relationship between the contacts in the first contact module 130 to determine the target connection mode corresponding to the battery pack.

[0060] Specifically, the battery pack includes a cell module 110, which is used to store electrical energy. The cell module 110 includes a positive electrode and a negative electrode. A potential difference is generated in the cell module 110 through a chemical reaction, and the electrical energy is stored in the cell. The positive and negative electrodes of the cell module 110 are both connected to a battery management compatible module 120, which unifies the architecture of the battery management system (BMS) in the low-voltage battery system and the high-voltage battery system in the prior art, that is, the BMS of the first-level architecture in the low-voltage battery system and the BMS of the second-level architecture in the high-voltage battery system are unified into a battery management compatible module 120 of the first-level architecture, and in terms of BMS, the structure of the battery pack is unified. In addition, since the connection mode of the battery packs in different battery systems in the prior art is fixed, the battery packs in different battery systems cannot be universal. Therefore, in addition to unifying the BMS architecture in the battery pack, in the embodiment of the present invention, a first contact module 130 is provided in the battery pack, and a first knob is provided on the outer shell of the battery pack. The first knob is connected to the first contact module 130. By rotating the first knob, the connection relationship between the contacts in the first contact module 130 is changed, that is, the internal cable structure of the battery pack is changed, and then the target connection mode corresponding to the battery pack is changed. For example, the battery pack is initially in a series connection mode, and by rotating the first knob, the battery pack can be changed from a series connection mode to a parallel connection mode, or the battery pack is initially in a series connection mode, and by rotating the first knob in the opposite direction, the battery pack can be changed from a parallel connection mode to a series connection mode. By flexibly changing the target connection mode of the battery pack, problems corresponding to different application scenarios can be solved. For example, in a parallel application scenario, the parallel connection method will accelerate the aging problem of the battery pack, that is, the parallel connection of battery packs with low internal resistance will result in a larger output current and a faster attenuation of the battery pack. At this time, the parallel connection method of each battery pack can be adjusted to a series-parallel combination method according to the internal resistance of each battery pack. For example, the battery packs are grouped, and the battery packs in the same group are connected in parallel, and the battery packs between different groups can be connected in series. In addition, the parallel connection method of each battery pack can be adjusted to a temporary series connection method, and the output voltage can be increased by connecting the battery packs in series. After the energy storage battery system 200 is supplemented, the battery packs can be adjusted to a parallel connection method again, solving the problem that the battery packs in the energy storage battery system 200 cannot be turned on due to power loss when connected in parallel. In the application scenario of the parallel-series combination, since a single battery cannot be charged individually, the battery packs can be adjusted to a parallel connection mode to recharge the energy storage battery system 200. Adjusting to a parallel connection mode can also balance the battery packs that are connected in series and have inconsistent power levels, making each battery pack balanced and consistent, which is convenient for management personnel to manage the battery pack, and users can freely expand the capacity by adjusting the target connection mode of the battery pack.

[0061] Further, such as Figure 3 As shown, the first contact module 130 includes: a first contact, a second contact, a third contact and a fourth contact, wherein:

[0062] The first contact is connected to the first input end of the battery management compatible module 120 and the first quick-plug end of the battery pack, the second contact is connected to the second input end of the battery management compatible module 120, the first quick-plug end and the second quick-plug end of the battery pack, the third contact is connected to the second quick-plug end, and the fourth contact is connected to the third input end of the battery management compatible module 120.

[0063] Furthermore, Figure 4 is a schematic diagram of a first knob provided in an embodiment of the present invention, such as Figure 4 As shown, when the first knob is rotated to connect the third contact and the fourth contact, the target connection mode corresponding to the battery pack is a series connection mode;

[0064] When the first knob is rotated to connect the first contact and the third contact, and the second contact and the fourth contact, the target connection mode corresponding to the battery pack is a parallel connection mode.

[0065] Specifically, the first knob includes six terminals and three connecting cables, and the six terminals are respectively disposed at both ends of each connecting cable. By rotating the first knob, each terminal is connected to the four contacts in the first contact module 130 to change the connection relationship between the four contacts in the first contact module 130. For example, Figure 4 As shown, when the indicating arrow in the first knob points to the horizontal direction, the two terminals of only one connecting cable in the first knob are connected to the third contact and the fourth contact respectively. At this time, the battery pack is in a series connection mode. Figure 5 FIG. 2 is a schematic diagram of a battery pack according to an embodiment of the present invention. The battery pack connected in series is as follows: Figure 5 As shown, after two battery packs in series connection are plugged in, the negative electrode of the cell module 110 in the lower battery pack is connected to the positive electrode of the cell module 110 in the upper battery pack. After the battery packs are connected in series to form a battery module 210, a closed circuit can be formed through the two contacts connected in the base 240. When the first knob is rotated 90° counterclockwise from the series connection mode, that is, when the indicator arrow in the first knob faces the vertical direction, the four terminals of the two connecting cables in the first knob are respectively connected to the four contacts in the first contact module 130, that is, the two terminals of one of the connecting cables are respectively connected to the first contact and the third contact, and the two terminals of the other connecting cable are respectively connected to the second contact and the fourth contact. At this time, the battery pack is in a parallel connection mode. Figure 6FIG. 3 is a schematic diagram of the structure of a battery pack provided by an embodiment of the present invention. The battery pack connected in parallel is as follows: Figure 6 As shown, after two battery packs in parallel connection are plugged in, the negative pole of the battery cell module 110 in the lower battery pack is connected to the negative pole of the battery cell module 110 in the upper battery pack, and at the same time, the positive pole of the battery cell module 110 in the lower battery pack is connected to the positive pole of the battery cell module 110 in the upper battery pack. Figure 7 2 is a schematic diagram of a battery module 210 in parallel connection according to an embodiment of the present invention. Figure 7 As shown, after the battery packs are connected in parallel to form the battery module 210, the two contacts in the base 240 are disconnected to prevent the battery module 210 connected in parallel from short circuiting.

[0066] Furthermore, Figure 8 is a schematic diagram of the structure of the battery management compatible module 120 provided in an embodiment of the present invention, such as Figure 8 As shown, the battery management compatible module 120 includes: a voltage sampling circuit 121, a micro control unit 122 and a step-down circuit 123, wherein:

[0067] The first end of the voltage sampling circuit 121 is connected to the micro control unit 122 and the fourth end of the step-down circuit 123, and the first end of the voltage sampling circuit 121 serves as the first input end of the battery management compatible module 120, the second end of the voltage sampling circuit 121 serves as the second input end of the battery management compatible module 120, the third end of the voltage sampling circuit 121 is connected to the first end of the step-down circuit 123, the third end of the voltage sampling circuit 121 serves as the third input end of the battery management compatible module 120, and the fourth end of the voltage sampling circuit 121 is connected to the micro control unit 122; the voltage sampling circuit 121 is used to collect the sampled voltage between the second contact and the fourth contact, and transmit it to the micro control unit 122;

[0068] The microcontroller unit 122 is connected to the second end and the third end of the step-down circuit 123. The microcontroller unit 122 is used to collect the sampling current between the third end of the step-down circuit 123 and the positive electrode of the battery module 210, and perform charge and discharge control based on the sampling current; and based on the sampling voltage, determine the corresponding warning result when the battery pack is adjusted from the series connection mode to the parallel connection mode.

[0069] Specifically, the second input end of the voltage acquisition circuit in the battery management compatible module 120 is connected to the second contact in the first contact module 130, and the third input end of the voltage acquisition circuit is connected to the fourth contact in the first contact module 130. The second contact and the fourth contact are respectively connected to two power supplies that do not share a common ground. The power supply connected to the second contact and the power supply connected to the fourth contact are respectively applied to the power management compatible module, and the sampling voltage between the second contact and the fourth contact after the dual power supplies are superimposed is collected through each voltage divider resistor in the voltage acquisition circuit, and the sampling voltage is transmitted to the microcontroller unit 122 (Micro Controller Unit, MCU). The MCU 122 can monitor the voltage corresponding to the second contact by collecting the sampling voltage, and then control the step-down circuit 123 to limit the voltage according to the sampling voltage, thereby playing a role of overcurrent protection. At the same time, through the sampling voltage, when the user switches from the series connection mode to the parallel connection mode, it can be judged whether there is a short circuit risk after changing to the parallel connection mode, thereby playing a role of short circuit protection. In addition, the MCU 122 can also collect the sampling current between the third terminal of the buck circuit 123 and the positive electrode of the battery module 210, and play a role of current limiting protection by adjusting the PWM (Pulse Width Modulation) duty cycle in the buck circuit 123.

[0070] Furthermore, the micro control unit 122 is specifically used for:

[0071] Obtaining a voltage of the battery cell module 110 corresponding to the battery cell module 110;

[0072] Determine a voltage difference between the sampled voltage and the voltage of the battery cell module 110;

[0073] When the voltage difference is greater than or equal to a preset threshold, determining that the warning result corresponding to the battery pack being adjusted from the series connection mode to the parallel connection mode is that adjustment is prohibited;

[0074] When the voltage difference is less than the preset threshold, it is determined that the corresponding warning result when the battery pack is adjusted from the series connection mode to the parallel connection mode is that the adjustment is allowed.

[0075] Specifically, when the user adjusts from the series connection mode to the parallel connection mode, the cell module 110 voltage corresponding to the cell module 110 can be obtained through the cell sampling unit (CSU) in the battery pack. The battery management module can compare the cell module 110 voltage with the sampled voltage to determine the voltage difference between the sampled voltage and the cell module 110 voltage. If the voltage difference is greater than or equal to the preset threshold, it indicates that there will be a short circuit risk after the user switches from the series connection mode to the parallel connection mode. At this time, a warning result prohibiting adjustment can be generated. If the voltage difference is less than the preset threshold, it indicates that there will be no short circuit risk after the user switches from the series connection mode to the parallel connection mode. At this time, a warning result allowing adjustment can be generated. The preset threshold can be set according to actual needs, and the embodiment of the present invention does not limit this. For example, the preset threshold is set to 0.1V, 0.5V or 1V, etc.

[0076] It should be noted that the CSU is connected to the positive and negative electrodes of the battery cell module 110 and the battery management compatible module 120, and can collect the voltage and temperature values ​​of the battery cell module 110 in the battery pack, and send the voltage and temperature values ​​of the battery cell module 110 to the battery management compatible module 120. Each battery pack includes a CSU, and the CSUs between the battery packs can communicate.

[0077] Optionally, the warning result may be used to remind the user via information, indicator light display, buzzer alarm, etc., which is not limited in this embodiment of the present invention.

[0078] In addition, in addition to determining the warning result based on the comparison result between the voltage difference and the preset threshold, the warning result can also be determined by detecting whether a short circuit occurs between the second contact and the fourth contact.

[0079] Further, such as Figure 8 As shown, the voltage sampling circuit 121 includes a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein:

[0080] One end of the resistor R1 serves as the third end of the voltage sampling circuit 121, the other end of the resistor R1 is connected to one end of the resistor R2 and one end of the resistor R3, the other end of the resistor R2 serves as the second end of the voltage sampling circuit 121, the other end of the resistor R3 is connected to one end of the resistor R4, and the other end of the resistor R3 serves as the fourth end of the voltage sampling circuit 121, and the other end of the resistor R4 serves as the first end of the voltage sampling circuit 121.

[0081] Specifically, since the power supplies connected to the second contact and the fourth contact do not share a common ground, when the voltage sampling circuit 121 collects the sampled voltage between the second contact and the fourth contact, based on the principle of dual-source circuit superposition, when the power supply U1 corresponding to the fourth contact acts on the power management compatible module, the resistor R1, the resistor R3 and the resistor R4 are used for voltage division, and the first sub-sampling voltage obtained is When the power source U2 corresponding to the second contact acts on the power management compatible module, the voltage is divided by the resistors R2, R3 and R4, and the second sub-sampling voltage obtained is Afterwards, the sum of the first sub-sampling voltage and the second sub-sampling voltage is determined as the sampling voltage.

[0082] Further, such as Figure 8 As shown, the step-down circuit 123 includes a MOS tube, an inductor L1 and a diode D1, wherein:

[0083] The gate of the MOS tube serves as the second end of the step-down circuit 123, the drain of the MOS tube serves as the first end of the step-down circuit 123, the source of the MOS tube is connected to one end of the inductor L1 and the cathode of the diode D1, the other end of the inductor L1 serves as the third end of the step-down circuit 123, and the anode of the diode D1 serves as the fourth end of the step-down circuit 123.

[0084] Specifically, when MCU 122 determines that the warning result is to prohibit adjustment, that is, to prohibit the battery pack from being adjusted from a series connection mode to a parallel connection mode, the MOS tube can be controlled to be disconnected, and the user can be reminded that there is a risk of short circuit after adjusting to a parallel connection mode. In addition, when the battery pack is charging and discharging, MCU 122 is also used to perform current sampling. If the sampled current is too high, the PWM duty cycle can be reduced to control the MOS tube to perform high-frequency switching to perform current limiting control. If it is detected that the sampling voltage reaches the threshold, the MOS tube is controlled to be disconnected to stop charging the battery pack.

[0085] The battery pack provided by the embodiment of the present invention is configured with a battery management compatible module 120, a first contact and a shell 140 in the battery pack, and the connection relationship between the contacts in the first contact module 130 is adjusted by rotating the first knob on the shell 140 to adjust the target connection method corresponding to the battery pack, unify the structure of each battery pack and the architecture of the battery management compatible module 120, improve the universality of the battery pack and the battery system composed of the battery packs, and enable the battery system to meet the needs of different application scenarios.

[0086] The embodiment of the present invention further provides an energy storage battery system 200, comprising: at least one battery module 210 and a base 240, wherein:

[0087] Each of the battery modules 210 includes at least two battery packs as described above, the battery packs are plugged into each other, and the battery pack at the bottom is plugged into the base 240;

[0088] The base 240 is provided with a second contact module and a second knob, the second knob is connected to the second contact module, and the second knob is used to adjust the connection relationship between the contacts in the second contact module based on the target connection mode corresponding to each battery pack in the battery module 210.

[0089] Specifically, any two battery packs in the same battery module 210 are connected by plugging the first quick-plug end of one of the battery packs with the second quick-plug end of the other battery pack, so as to achieve the connection between any two battery packs. After multiple battery packs are plugged, the first quick-plug end of the battery pack on the top layer is connected to the positive and negative electrodes of the battery module 210, and the main control high-voltage box is connected through the positive and negative electrodes of the battery module 210, and the second quick-plug end of the battery pack on the bottom layer is plugged with the base 240. The base 240 is provided with a second contact module and a second knob, and the second knob is connected to the second contact module. According to the target connection mode of each battery pack in the battery module 210, the second knob is rotated to change the connection relationship between the two contacts in the second contact module, that is, to change the internal cable structure in the base 240, thereby forming feedback for each battery pack in the battery module 210.

[0090] Optionally, the target connection modes of the battery packs in the same battery module 210 are the same, and the target connection modes of the battery packs in different battery modules 210 may be the same or different. For example, four battery packs are connected in parallel to form a group of battery modules 210, and then the four groups of battery modules 210 are connected in series to form an energy storage battery system 200 including 16 battery packs. The current system information of the energy storage battery system 200 can be sent to the energy storage converter 230 through the battery cluster management unit 220, and the charge and discharge voltage and current of the energy storage battery system 200 are adjusted through the energy storage converter 230.

[0091] Furthermore, Fig. 9 is a schematic diagram of a second knob provided in an embodiment of the present invention, such as Fig. 9 As shown, the second contact module includes: a fifth contact and a sixth contact, wherein:

[0092] When the target connection mode corresponding to each battery pack in the battery module 210 is a series connection mode, the second knob is rotated until the fifth contact is connected to the sixth contact;

[0093] When the target connection mode corresponding to each battery pack in the battery module 210 is a parallel connection mode, the second knob is rotated until the fifth contact and the sixth contact are disconnected.

[0094] Specifically, the second knob includes two terminals and a connecting cable, and the two terminals are respectively arranged at the two ends of the connecting cable. By rotating the second knob, the terminals are connected to the fifth contact and the sixth contact in the second contact module to match the target connection mode corresponding to each battery pack in the battery module 210. For example, when the battery packs are connected in series, the second knob is turned, and the indicating arrow in the second knob is directed to the horizontal direction. At this time, the two terminals of the connecting cable in the second knob are respectively connected to the fifth contact and the sixth contact, so that the fourth and fifth contacts are connected to the sixth contact, and together with the battery packs connected in series in the battery module 210, a closed loop is formed. When the battery packs are connected in parallel, the second knob is turned, and the indicating arrow in the second knob is directed to the vertical direction. At this time, the two terminals of the connecting cable in the second knob are not connected to the fifth contact and the sixth contact, so that the fifth contact and the sixth contact are disconnected, so as to avoid the short circuit of each battery pack in the battery module 210 after the fifth contact and the sixth contact are short-circuited.

[0095] Furthermore, Fig.10 is a schematic diagram of the structure of the energy storage battery system provided by an embodiment of the present invention, such as Fig.10 As shown, the energy storage battery system 200 further includes: an energy storage converter 230 and a battery cluster management unit 220, wherein:

[0096] The energy storage converter 230 is connected to the battery cluster management unit 220 , and the battery cluster management unit 220 is connected to the battery management compatible modules 120 in each of the battery packs via a bus.

[0097] Specifically, the energy storage battery system 200 also includes an energy storage converter 230 (Power Conversion System, PCS) and a battery cluster management unit 220 (Battery Cluster Unit, BCU). Each battery pack is provided with a battery collection unit and a battery management compatible module 120. The battery collection module obtains the collection information of the single battery pack, which may include the target connection mode of the battery pack, the voltage and temperature value of the battery cell module 110, etc., and sends the collection information to the battery management compatible module 120, so that the battery management compatible module 120 can control the single battery pack. At the same time, the battery management compatible modules 120 corresponding to each battery pack can be connected via a bus, and the collected information can be sent to the BCU via the bus. The BCU can play a master control role when the energy storage battery system 200 is a series system, and when the energy storage battery system 200 is a parallel system, it can control a single battery pack by controlling the battery management compatible modules 120 in each battery pack, unify the battery management system architecture in each battery pack, and then unify the external interface structure of each battery pack, further improve the universality of the energy storage battery system 200, and expand the application scenarios of the energy storage battery system 200.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack, It is characterized in that include: Battery cell module; A battery management compatible module, the battery management compatible module is connected to the battery cell module; A first contact module, the first contact module being connected to the battery management compatible module; The battery cell module, the battery management compatible module and the first contact module are all arranged in the shell, and a first knob is arranged outside the shell, the first knob is connected to the first contact module, and the first knob is used to adjust the connection relationship between the contacts in the first contact module to determine the target connection mode corresponding to the battery pack.

2. The battery pack according to claim 1, It is characterized in that The first contact module includes: a first contact, a second contact, a third contact and a fourth contact, wherein: The first contact is connected to the first input end of the battery management compatible module and the first quick-plug end of the battery pack, the second contact is connected to the second input end of the battery management compatible module, the first quick-plug end and the second quick-plug end of the battery pack, the third contact is connected to the second quick-plug end, and the fourth contact is connected to the third input end of the battery management compatible module.

3. The battery pack according to claim 2, It is characterized in that When the first knob is rotated to connect the third contact and the fourth contact, the target connection mode corresponding to the battery pack is a series connection mode; When the first knob is rotated to connect the first contact and the third contact, and the second contact and the fourth contact, the target connection mode corresponding to the battery pack is a parallel connection mode.

4. The battery pack according to claim 2 or 3, It is characterized in that The battery management compatible module includes: a voltage sampling circuit, a micro control unit and a step-down circuit, wherein: The first end of the voltage sampling circuit is connected to the micro control unit and the fourth end of the step-down circuit, and the first end of the voltage sampling circuit serves as the first input end of the battery management compatible module, the second end of the voltage sampling circuit serves as the second input end of the battery management compatible module, the third end of the voltage sampling circuit is connected to the first end of the step-down circuit, the third end of the voltage sampling circuit serves as the third input end of the battery management compatible module, and the fourth end of the voltage sampling circuit is connected to the micro control unit; the voltage sampling circuit is used to collect the sampled voltage between the second contact and the fourth contact, and transmit it to the micro control unit; The microcontroller unit is connected to the second end and the third end of the step-down circuit. The microcontroller unit is used to collect a sampling current between the third end of the step-down circuit and the positive electrode of the battery module, and perform charge and discharge control based on the sampling current; and based on the sampling voltage, determine the corresponding warning result when the battery pack is adjusted from a series connection mode to a parallel connection mode.

5. The battery pack according to claim 4, It is characterized in that The micro control unit is specifically used for: Obtaining a cell module voltage corresponding to the cell module; Determine a voltage difference between the sampled voltage and the cell module voltage; When the voltage difference is greater than or equal to a preset threshold, it is determined that the warning result corresponding to the adjustment of the battery pack from the series connection mode to the parallel connection mode is prohibited adjustment; When the voltage difference is less than the preset threshold, it is determined that the warning result corresponding to the adjustment of the battery pack from the series connection mode to the parallel connection mode is allowed adjustment.

6. The battery pack according to claim 4, wherein: The voltage sampling circuit includes resistor R1, resistor R2, resistor R3, and resistor R4, where: One end of the resistor R1 serves as the third end of the voltage sampling circuit, the other end of the resistor R1 is connected to one end of the resistor R2 and one end of the resistor R3, the other end of the resistor R2 serves as the second end of the voltage sampling circuit, the other end of the resistor R3 is connected to one end of the resistor R4, and the other end of the resistor R3 serves as the fourth end of the voltage sampling circuit, and the other end of the resistor R4 serves as the first end of the voltage sampling circuit.

7. The battery pack according to claim 4, wherein: The buck circuit includes a MOS transistor, an inductor L1, and a diode D1, where: The gate of the MOS transistor serves as the second end of the buck circuit, the drain of the MOS transistor serves as the first end of the buck circuit, the source of the MOS transistor is connected to one end of the inductor L1 and the cathode of the diode D1, the other end of the inductor L1 serves as the third end of the buck circuit, and the anode of the diode D1 serves as the fourth end of the buck circuit.

8. An energy storage battery system, wherein: It includes: At least one battery module and a base, where: Each of the battery modules includes at least two battery packs according to any one of claims 1-7, the battery packs are plugged into each other, and the lowermost battery pack is plugged into the base; A second contact module and a second knob are provided on the base, the second knob is connected to the second contact module, and the second knob is used to adjust the connection relationship between the contacts in the second contact module based on the target connection mode of each battery pack in the battery module.

9. The energy storage battery system according to claim 8, wherein: The second contact module includes: a fifth contact and a sixth contact, where: When the target connection mode of each battery pack in the battery module is the series connection mode, the second knob rotates to connect the fifth contact and the sixth contact; When the target connection mode of each battery pack in the battery module is the parallel connection mode, the second knob rotates to disconnect the fifth contact and the sixth contact.

10. The energy storage battery system according to claim 9, wherein: It further includes: An energy storage converter and a battery cluster management unit, where: The energy storage converter is connected to the battery cluster management unit, and the battery cluster management unit is connected to the battery management compatibility module in each battery pack through a bus.

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