A battery pack

Abstract

The utility model relates to a kind of battery groups, including control unit, battery unit and bypass switch Q3;Battery unit is multiple, multiple battery unit is sequentially connected and forms battery unit group, and battery unit group also sequentially connects current detection unit, discharge protection unit Q1 and charging protection unit Q2 to form battery group ontology;Bypass switch Q3 and the parallel arrangement between the battery group ontology;Control unit is connected with battery unit group by multiple connecting points, and control unit connection is respectively connected discharge protection unit Q1, charging protection unit Q2, bypass switch Q3.The utility model control unit is connected to bypass switch Q3 by a control signal line, when control unit detects that battery has been filled, it will send a signal to make bypass switch Q3 conduct, to bypass charging current to the next group of battery group needing charging, to ensure that all series-connected battery group can be filled, and can prevent battery overcharge, improve the safety of battery group ontology when charging.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery pack. Background Technology

[0002] Currently, battery packs used in mechanical equipment on the market cannot be used in series. This is because when multiple battery packs are connected in series for charging, if the charging protection unit of one battery pack is disconnected, the entire battery pack will be disconnected and unable to continue charging. This results in multiple battery packs connected in series not being fully charged, affecting the use of the batteries and greatly limiting their application scenarios. Therefore, it is necessary to develop a battery pack that can be used in series. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a battery pack.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a battery pack, including a control unit, a battery unit and a bypass switch Q3;

[0005] The battery unit consists of multiple battery units connected in series to form a battery unit group. The battery unit group is also connected in series with a current detection unit, a discharge protection unit Q1 and a charging protection unit Q2 to form the battery pack body.

[0006] The bypass switch Q3 and the battery pack body are connected in parallel;

[0007] The control unit is connected to the battery cell group through multiple connection points. The control unit is connected to the discharge protection unit Q1 through a control signal line. The control unit is connected to the charging protection unit Q2 through a control signal line. The control unit is connected to the bypass switch Q3 through a control signal line.

[0008] In a preferred embodiment of this utility model, the discharge protection unit Q1 is a discharge protection MOS transistor connected in series between the negative terminal of the battery cell group and P- / C-. When the control unit detects an abnormality, it shuts down the discharge protection unit Q1 to cut off the discharge circuit.

[0009] The charging protection unit Q2 is a charging protection MOSFET, which is connected in parallel with the discharging protection unit Q1 between P- / C- and the negative terminal of the battery cell group. When the control unit detects an overcharge abnormality, it turns off Q2 to cut off the charging circuit.

[0010] In a preferred embodiment of this utility model, the bypass switch Q3 is a MOSFET connected in parallel to the P+ / C+ terminal corresponding to the control unit. After the battery is fully charged, the control unit controls the bypass switch Q3 to turn on, thereby realizing a specific bypass function after full charge.

[0011] In a preferred embodiment of this utility model, the bypass switch Q3 is a relay connected in parallel to the corresponding terminals of P+ / C+ and the control unit. After the battery is fully charged, the control unit controls the bypass switch Q3 to turn on, thereby realizing the bypass function after the battery is fully charged.

[0012] In a preferred embodiment of this utility model, there are multiple battery packs, with the P+ / C+ terminals of the adjacent battery pack connected in series with the P- / C- terminals of the next battery pack.

[0013] In a preferred embodiment of this utility model, the battery unit is a lithium iron phosphate battery, a ternary battery, a lithium manganese oxide battery, a sodium-ion battery, a fuel cell, or a lithium-sulfur battery.

[0014] In a preferred embodiment of this utility model, the battery cell is a solid-state or semi-solid-state battery.

[0015] The beneficial effects of this invention are as follows: The control unit of this invention is connected to the bypass switch Q3 via a control signal line. When the control unit detects that the battery is fully charged, it sends a signal to turn on the bypass switch Q3, thereby bypassing the charging current to the next battery pack that needs charging. This ensures that all series-connected battery packs can be fully charged and prevents overcharging, effectively avoiding fires caused by overcharging of the battery pack itself and improving the safety of the battery pack during charging. This invention enables the series connection of multiple lithium battery packs, increasing the application scenarios for multiple lithium battery packs and improving adaptability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 ;

[0018] Figure 3 This is a schematic diagram of the structure of this utility model. Figure 3 ;

[0019] Figure 4 This is a schematic diagram of a multi-cell battery pack connected in series. Figure 1 ;

[0020] Figure 5 This is a schematic diagram of a multi-cell battery pack connected in series. Figure 2 ;

[0021] Figure 6 This is a schematic diagram of a multi-cell battery pack connected in series. Figure 3 ; Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] like Figures 1 to 3 The battery pack shown includes a control unit, battery cells, and a bypass switch Q3;

[0025] The battery unit comprises multiple battery cells, which are connected in series to form a battery cell group. The battery cell group is also connected in series with a current detection unit, a discharge protection unit Q1, and a charging protection unit Q2 to form the battery pack body. The battery cell in this application is a lithium iron phosphate battery, a ternary battery, a lithium manganese oxide battery, a sodium-ion battery, a fuel cell, or a lithium-sulfur battery. The battery cell is a solid-state or semi-solid-state battery.

[0026] The bypass switch Q3 and the battery pack body are connected in parallel;

[0027] The control unit is connected to the battery cell group through multiple connection points. The control unit is connected to the discharge protection unit Q1 through a control signal line. The control unit is connected to the charging protection unit Q2 through a control signal line. The control unit is connected to the bypass switch Q3 through a control signal line.

[0028] Multiple battery cells 3 are connected in series to form a battery cell group to provide electrical energy. The current detection unit in this application is a resistor R1, connected in series between the negative terminal of the battery cell group and the discharge protection unit Q1, used to detect the circuit current. The control unit is connected to the battery group (BATn, BAT2, BAT1) through multiple connection points. These connection points are used to monitor parameters such as battery voltage and current, thereby realizing the charging and discharging management of the batteries. The control unit receives voltage and other signals from each cell in the battery cell group (BAT1, BAT2, BATn, etc.) and outputs control signals to manage the discharge protection unit Q1, the charging protection unit Q2, and the bypass switch Q3.

[0029] In a preferred embodiment, the discharge protection unit Q1 in this application is a discharge protection MOSFET, connected in series between the negative terminal and P- / C- of the battery cell group. The control unit is connected to the gate of the discharge protection unit Q1 through a control signal line. When the control unit detects that discharge protection is needed (e.g., the battery voltage is too low or the current is too high), it sends a signal to turn off the discharge protection unit Q1, thereby cutting off the discharge path and protecting the battery.

[0030] The charging protection unit Q2 is a charging protection MOSFET, which is connected in parallel with the discharging protection unit Q1 between the P- / C- and the negative terminal of the battery cell group. When the control unit detects an overcharge abnormality (such as excessive battery voltage or excessive current), it will send a signal to turn off the charging protection unit Q2, thereby cutting off the charging path and protecting the battery.

[0031] like Figure 1 and Figure 2 As shown, the bypass switch Q3 is a MOSFET connected in parallel to the P+ / C+ terminals corresponding to the control unit. After the battery is fully charged, the control unit controls the bypass switch Q3 to turn on, achieving a specific bypass function after full charge. Figure 3 As shown, the bypass switch Q3 is a relay connected in parallel to the P+ / C+ terminals corresponding to the control unit. When the control unit detects that the battery is fully charged, it controls relay Q3 to close, thereby bypassing the charging current and preventing overcharging, thus achieving a specific bypass function after full charge. Specifically, the control unit is connected to bypass switch Q3 via a control signal line. When the control unit detects that the battery is fully charged, it sends a signal to turn on bypass switch Q3, thereby bypassing the charging current and preventing overcharging.

[0032] P+ / C+ is the positive output / charging input terminal of the battery pack, and P- / C- is the negative output / charging input terminal of the battery pack, which is connected to an external load or charger.

[0033] As a preferred implementation method, such as Figures 4-6 As shown, the battery packs in this application are multiple, with the P+ / C+ terminals of the adjacent battery pack connected in series with the P- / C- terminals of the next battery pack. Figure 4 As shown, there are N battery packs, including group 1, group 2, ..., group N. The P+ / C+ of group 1 is connected to the P- / C- of group 2, the P+ / C+ of group 2 is connected to the P- / C- of group 3, ..., the P+ / C+ of group N-1 is connected to the P- / C- of group N. During the charging process of the battery pack in group 1, when the control unit detects the need for discharge protection (e.g., low battery voltage or excessive current), it sends a signal to turn off the discharge protection unit Q1, thereby cutting off the discharge path and protecting the battery. The control unit is connected to the charging protection unit Q2 through a control signal line. When the control unit detects the need for charging protection (e.g., high battery voltage or excessive current), it sends a signal to turn off the charging protection unit Q2, thereby cutting off the charging path and protecting the battery. The control unit is connected to the bypass switch Q3 through a control signal line. When the control unit detects that the battery is fully charged, it sends a signal to turn on the bypass switch Q3, thereby allowing the charging current to flow into group 2, realizing the charging of the battery pack in group 2 and preventing the battery pack in group 1 from being overcharged. That is, when the first battery pack is fully charged, the discharge protection unit Q1 is turned off, the charging protection unit Q2 is turned off, and the bypass switch Q3 is turned on. At this time, the current passes through the bypass switch Q3, bypassing the current battery pack, to continue charging the second battery pack connected in series, and so on, so as to ensure that all battery packs connected in series can be fully charged.

[0034] The control unit of this invention is connected to a bypass switch Q3 via a control signal line. When the control unit detects that the battery is fully charged, it sends a signal to turn on the bypass switch Q3, thereby bypassing the charging current to the next battery pack that needs charging. This ensures that all series-connected battery packs are fully charged and prevents overcharging, effectively avoiding fires caused by overcharging of the battery pack itself and improving the safety of the battery pack during charging. This invention enables the series connection of multiple lithium battery packs, increasing the application scenarios for multiple lithium battery packs and improving adaptability.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A battery pack, characterized in that, Includes control unit, battery unit and bypass switch Q3; The battery unit consists of multiple battery units connected in series to form a battery unit group. The battery unit group is also connected in series with a current detection unit, a discharge protection unit Q1 and a charging protection unit Q2 to form the battery pack body. The bypass switch Q3 and the battery pack body are connected in parallel; The control unit is connected to the battery cell group through multiple connection points. The control unit is connected to the discharge protection unit Q1 through a control signal line. The control unit is connected to the charging protection unit Q2 through a control signal line. The control unit is connected to the bypass switch Q3 through a control signal line.

2. The battery pack according to claim 1, characterized in that, The discharge protection unit Q1 is a discharge protection MOSFET connected in series between the negative terminal of the battery cell and P- / C-. When the control unit detects an abnormality, it shuts down the discharge protection unit Q1 and cuts off the discharge circuit. The charging protection unit Q2 is a charging protection MOSFET, which is connected in parallel with the discharging protection unit Q1 between P- / C- and the negative terminal of the battery cell group. When the control unit detects an overcharge abnormality, it turns off Q2 to cut off the charging circuit.

3. The battery pack according to claim 2, characterized in that, The bypass switch Q3 is a MOSFET connected in parallel to the P+ / C+ terminals corresponding to the control unit. After the battery is fully charged, the control unit controls the bypass switch Q3 to turn on, realizing the bypass function after the battery is fully charged.

4. The battery pack according to claim 2, characterized in that, The bypass switch Q3 is a relay connected in parallel to the corresponding terminals of P+ / C+ and the control unit. After the battery is fully charged, the control unit controls the bypass switch Q3 to turn on, realizing the bypass function after the battery is fully charged.

5. The battery pack according to claim 3 or 4, characterized in that, The battery packs are multiple, with the P+ / C+ terminals of the previous battery pack connected in series with the P- / C- terminals of the next battery pack.

6. The battery pack according to claim 1, characterized in that, The battery unit is a lithium iron phosphate battery, a ternary lithium battery, a lithium manganese oxide battery, a sodium-ion battery, a fuel cell, or a lithium-sulfur battery.

7. The battery pack according to claim 1, characterized in that, The battery cell is a solid-state or semi-solid-state battery.

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