Battery module monomer cell charging control system
By adding control circuits to the single battery cell of the battery module, the individual recharge of each single battery cell is solved, and the low voltage and low capacity problems caused by the long-term use of lithium batteries is solved, extending the service life and reducing after-sales cost.
Patent Information
- Application Number
- CN202421122723.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-05-22
AI Technical Summary
When lithium batteries are not used for a long time, low voltage, low capacity and other problems are prone to occur due to self-discharge. The existing solution is usually to replace the battery cell, resulting in waste of resources and increased after-sales cost.
A battery module single-cell battery cell recharge control system is designed, including a battery module unit, a BMS unit and a power supply control unit. By adding a control circuit to each single battery cell, individual power supply of each single battery cell is realized.
It effectively solves the problems of low capacity and excessive pressure difference caused by long-term static energy storage products, extends the service life of the battery module, and reduces after-sales maintenance costs.
Smart Images
Figure CN222813663U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery module single cell power replenishment control system. Background Art
[0002] With the rise and development of new energy, the application scenarios of lithium batteries are also increasing. Lithium batteries are a common rechargeable battery and have become the focus of my country's energy structure transformation. With the rapid development of lithium battery technology, lithium batteries are widely used in fields such as mobile devices and electric vehicles. However, if not used for a long time, the battery cells of energy storage products (such as base station energy storage, communication products, UPS, etc.) are prone to low voltage and low capacity due to self-discharge. At present, the common method to solve the above-mentioned low voltage and low capacity problems is to replace the battery cells. If the battery cell is fixed by bolt fastening connection, only the battery cell needs to be replaced; however, if the battery cell is fixed by laser welding connection, the entire module needs to be replaced, resulting in a waste of resources and greatly increasing the after-sales cost. Utility Model Content
[0003] The embodiment of the utility model provides a battery module single cell recharge control system, which aims to solve the problems of low voltage and low capacity due to self-discharge when the existing cells are not used for a long time. Through this application, low voltage and low capacity single cells can be recharged when the battery module is stationary.
[0004] To achieve the above-mentioned purpose, the embodiment of the utility model provides a battery module single cell power replenishment control system, comprising a battery module unit, a BMS unit and a power replenishment control unit, wherein the battery module unit is connected to the BMS unit and the power replenishment control unit respectively, and the power replenishment control unit is connected to the BMS unit;
[0005] The battery module unit includes a plurality of single cells connected in series, the negative terminal of the battery module unit and each of the single cells are respectively connected to the BMS unit; and each of the single cells is respectively connected to the power replenishment control unit.
[0006] As a preferred embodiment, the negative terminal of the battery module unit and the positive terminal of each of the single cells are respectively connected to the voltage collection port of the BMS unit, and the negative terminal of the battery module unit and the single cells are respectively arranged in a one-to-one correspondence with the voltage collection port.
[0007] As a preferred implementation, the power supplement control unit includes a control module, a power module and a plurality of MOS control circuits, and each of the MOS control circuits is connected to the control module and the power module respectively;
[0008] The control module is connected to the BMS unit; the negative terminal of the battery module unit and the positive terminal of each single cell are respectively connected to the MOS control circuit, and the negative terminal of the battery module unit and the positive terminal of each single cell are respectively arranged in a one-to-one correspondence with the MOS control circuit.
[0009] As a preferred implementation, the positive electrode of the output end of the power module is respectively connected to the positive electrode of each MOS control circuit input end, and the negative electrode of the output end of the power module is respectively connected to the negative electrode of each MOS control circuit input end.
[0010] As a preferred implementation, the voltage at the input end of the power module is 48V to 220V.
[0011] As a preferred implementation, the input end of the power module is AC or DC, preferably 220V AC or 48V DC.
[0012] As a preferred implementation, the voltage at the output end of the power module is 3.65V, and the current at the output end of the power module is 5A-10A.
[0013] As a preferred implementation, the output end of the power module is direct current.
[0014] As a preferred embodiment, the communication interface of the BMS unit is connected to the communication interface of the control module. As a preferred embodiment, the single cell is a sodium ion single cell or a lithium ion single cell.
[0015] The present application can realize individual charging of each single cell by setting up a charging control unit and adding a control circuit to each single cell of the battery module. The power module input end of the charging control unit can be selected according to the actual situation, so that the present application can be applied to energy storage products in various scenarios. The circuit control of the present application is simple and the cost of use is low. It can effectively improve the service life of the battery module and effectively reduce the after-sales maintenance cost. The present application can charge the low-voltage and low-capacity single cells of the battery module to the same level when it is stationary according to actual needs, which can solve the problems of low capacity of the cells and excessive pressure difference caused by long-term static storage products. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0017] Figure 1 This is a structural schematic diagram of a battery module single cell power replenishment control system according to an embodiment of the utility model;
[0018] Figure 2 yes Figure 1 Schematic diagram of the circuit structure of the battery module single cell power replenishment control system. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.
[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0021] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.
[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0024] Specifically, Figure 1 to Figure 2 As shown, the embodiment of the utility model provides a battery module single cell power replenishment control system, including a battery module unit 10, a BMS unit 20 and a power replenishment control unit 30, wherein the battery module unit 10 is connected to the BMS unit 20 and the power replenishment control unit 30 respectively, and the power replenishment control unit 30 is connected to the BMS unit 20;
[0025] The battery module unit 10 includes a plurality of single cells E connected in series. The negative terminal B− of the battery module unit 10 and each of the single cells E are respectively connected to the BMS unit 20 ; and each of the single cells E is respectively connected to the power replenishment control unit 30 .
[0026] Specifically, in this embodiment, there are eight single cells E connected in series, including E1, E2, E3, E4, E5, E6, E7 and E8. The number of single cells can be connected in series according to actual needs, which can be three, eight, eleven or even more.
[0027] As a preferred embodiment, the negative terminal B- of the battery module unit 10 and the positive terminal of each of the single cells E are respectively connected to the voltage collection port B of the BMS unit 20, and the negative terminal B- of the battery module unit 10 and the single cells E are respectively arranged in a one-to-one correspondence with the voltage collection port B.
[0028] Specifically, Figure 2As shown, in this embodiment, the negative terminal B- is set corresponding to the voltage collection port B1-; the single cell E1 is set corresponding to the voltage collection port B1; the single cell E2 is set corresponding to the voltage collection port B2; the single cell E3 is set corresponding to the voltage collection port B3; the single cell E4 is set corresponding to the voltage collection port B4; the single cell E5 is set corresponding to the voltage collection port B5; the single cell E6 is set corresponding to the voltage collection port B6; the single cell E7 is set corresponding to the voltage collection port B7; the single cell E8 is set corresponding to the voltage collection port B8. As a preferred embodiment, the power replenishment control unit 30 includes a control module 31, a power module 32 and a plurality of MOS (Metal Oxide Semiconductor, Metal-Oxide-Semiconductor Field Effect Transistor) control circuits 33, each of the MOS control circuits 33 is respectively connected to the control module 31 and the power module 32;
[0029] The control module 31 is connected to the BMS unit 20; the negative terminal B- of the battery module unit 10 and the positive terminal of each of the single cells E are respectively connected to the MOS control circuit 33, and the negative terminal B- of the battery module unit 10 and the positive terminal of each of the single cells E are respectively arranged in a one-to-one correspondence with the MOS control circuit 33.
[0030] Specifically, Figure 2 As shown, in this embodiment, the negative terminal B- is arranged corresponding to the control circuit 1; the single cell E1 is arranged corresponding to the control circuit 2; the single cell E2 is arranged corresponding to the control circuit 3; the single cell E3 is arranged corresponding to the control circuit 4; the single cell E4 is arranged corresponding to the control circuit 5; the single cell E5 is arranged corresponding to the control circuit 6; the single cell E6 is arranged corresponding to the control circuit 7; the single cell E7 is arranged corresponding to the control circuit 8; the single cell E8 is arranged corresponding to the control circuit 9.
[0031] As a preferred embodiment, the positive electrode of the output end of the power module 32 is respectively connected to the positive electrode of the input end of each MOS control circuit 33, and the negative electrode of the output end of the power module 32 is respectively connected to the negative electrode of the input end of each MOS control circuit 33.
[0032] As a preferred implementation, the voltage at the input end of the power module 32 is 48V to 220V.
[0033] As a preferred embodiment, the input end of the power module 32 is AC or DC, preferably 220V AC or 48V DC.
[0034] As a preferred implementation, the voltage at the output end of the power module 32 is 3.65V, and the current at the output end of the power module 32 is 5A to 10A.
[0035] As a preferred embodiment, the output end of the power module 32 is direct current.
[0036] As a preferred implementation, the communication interface of the BMS unit 20 is connected to the communication interface of the control module 31 .
[0037] As a preferred embodiment, the single battery cell E is a sodium ion single battery cell or a lithium ion single battery cell.
[0038] When the system of the present application is in working state, the control module controls the MOS control circuit to work by receiving the voltage signal of the single cell of the BMS unit. The MOS control circuit controls the connection of the positive and negative lines of the output end (3.65V) of the power module to charge the corresponding single cell. For example:
[0039] ① When the single cell E1 is charged, the control module controls the control circuit 2 to be turned on, and the control circuit 2 controls the power module to charge the single cell E1.
[0040] ② When the single cell E2 is charged, the control module controls the control circuit 3 to be turned on, and the control circuit 3 controls the power module to charge the single cell E2.
[0041] ③The charging methods for other batteries are similar.
[0042] The present application can realize individual charging of each single cell by setting up a charging control unit and adding a control circuit to each single cell of the battery module. The power module input end of the charging control unit can be selected according to the actual situation, so that the present application can be applied to energy storage products in various scenarios. The circuit control of the present application is simple and the cost of use is low. It can effectively improve the service life of the battery module and effectively reduce the after-sales maintenance cost. The present application can charge the low-voltage and low-capacity single cells of the battery module to the same level when it is stationary according to actual needs, which can solve the problems of low capacity of the cells and excessive pressure difference caused by long-term static storage products.
[0043] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.
[0044] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A battery module single cell power replenishment control system, characterized in that: It includes a battery module unit, a BMS unit and a power replenishment control unit, wherein the battery module unit is connected to the BMS unit and the power replenishment control unit respectively, and the power replenishment control unit is connected to the BMS unit; The battery module unit includes a plurality of single cells connected in series, the negative terminal of the battery module unit and each of the single cells are respectively connected to the BMS unit; and each of the single cells is respectively connected to the power replenishment control unit.
2. The battery module single cell power replenishment control system according to claim 1, characterized in that: The negative terminal of the battery module unit and the positive terminal of each of the single cells are respectively connected to the voltage collection port of the BMS unit, and the negative terminal of the battery module unit and the single cells are respectively arranged in one-to-one correspondence with the voltage collection port.
3. The battery module single cell power replenishment control system according to claim 2, characterized in that: The power replenishment control unit includes a control module, a power module and a plurality of MOS control circuits, each of the MOS control circuits being connected to the control module and the power module respectively; The control module is connected to the BMS unit; the negative terminal of the battery module unit and the positive terminal of each single cell are respectively connected to the MOS control circuit, and the negative terminal of the battery module unit and the positive terminal of each single cell are respectively arranged in a one-to-one correspondence with the MOS control circuit.
4. The battery module single cell power replenishment control system according to claim 3, characterized in that: The positive pole of the output end of the power module is respectively connected to the positive pole of the input end of each MOS control circuit, and the negative pole of the output end of the power module is respectively connected to the negative pole of the input end of each MOS control circuit.
5. The battery module single cell power replenishment control system according to claim 3, characterized in that: The voltage at the input end of the power module is 48V to 220V.
6. The battery module single cell power replenishment control system according to claim 3, characterized in that: The input end of the power module is AC or DC.
7. The battery module single cell power replenishment control system according to claim 3, characterized in that: The voltage at the output end of the power module is 3.65V, and the current at the output end of the power module is 5A-10A.
8. The battery module single cell power replenishment control system according to claim 3, characterized in that: The output end of the power module is direct current.
9. The battery module single cell power replenishment control system according to claim 3, characterized in that: The communication interface of the BMS unit is connected to the communication interface of the control module.
10. The battery module single cell power replenishment control system according to claim 1, characterized in that: The single cell is a sodium ion single cell or a lithium ion single cell.