Battery pack with charging function

Abstract

The utility model discloses a battery pack with a charging function, and relates to the technical field of batteries. The battery pack comprises a shell, a BMS assembly, a BDU assembly, battery cells and a charging circuit, the charging circuit comprises a charging main circuit and a plurality of charging branch circuits, the shell is provided with a charging external connection end, the charging main circuit is connected to the charging external connection end, the charging branch circuits are connected to the charging main circuit in parallel, each charging branch circuit is connected with the corresponding battery cell, and the battery cells are connected to the charging main circuit. Each electricity supplementing branch line is provided with a branch switch used for controlling on-off of the branch line. And the selection controller is electrically connected with the plurality of branch switches, and the selection controller is also electrically connected with the BDU assembly. According to the battery pack with the charging function, the independent charging circuit is arranged in the battery pack, so that the low-voltage battery core in the battery pack can be independently charged through the charging circuit, and the voltage difference of the battery pack during charging and discharging is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack with a power replenishment function. Background Technology

[0002] In the field of rechargeable batteries, the manufacturing process itself can lead to significant voltage differences between cells. Secondly, uneven charging and discharging can also cause voltage differences between cells, and external factors such as temperature and usage conditions can also affect battery voltage.

[0003] When there is a voltage difference between the cells within a battery pack, a "breakdown" phenomenon can easily occur, potentially leading to serious accidents such as fires or explosions. Furthermore, the voltage difference between cells can also cause the battery's temperature to rise too quickly, resulting in battery failure or accelerated aging. Utility Model Content

[0004] To address the aforementioned deficiencies in the existing technology, this utility model provides a battery pack with a power replenishment function. By setting an independent power replenishment circuit within the battery pack, low-voltage cells within the battery pack can be individually replenished through the power replenishment circuit, thereby reducing the voltage difference of the battery pack during charging and discharging.

[0005] The technical solution of this utility model to solve the above problems is: to provide a battery pack with a power replenishment function, the battery pack comprising:

[0006] The system comprises a housing, a BMS assembly, a BDU assembly, battery cells, and a charging / discharging circuit. Multiple battery cells are installed within the housing. Both the BMS assembly and the BDU assembly are located within the housing. The BMS assembly is electrically connected to all battery cells, and the BDU assembly is also electrically connected to all battery cells.

[0007] The battery pack also includes:

[0008] The power supply circuit includes a main power supply line and multiple power supply branch lines. The housing is provided with a power supply external terminal. The main power supply line is connected to the power supply external terminal. Multiple power supply branch lines are connected in parallel to the main power supply line. Each power supply branch line is connected to the battery cell, and each power supply branch line is provided with a branch switch for controlling the on / off state of the branch line.

[0009] The selection controller is electrically connected to multiple branch switches and is also electrically connected to the BDU assembly.

[0010] Furthermore, the power replenishment circuit is provided in multiple ways, and the multiple power replenishment circuits are evenly arranged inside the housing, and the power replenishment external terminals of the multiple power replenishment circuits are evenly distributed on the housing.

[0011] Furthermore, the external power supply terminal includes a middle body, an external terminal, and an internal terminal. The housing has a snap-fit ​​hole, and the middle body is snapped into the snap-fit ​​hole. The external terminal is located outside the housing, and the internal terminal is located inside the housing.

[0012] Furthermore, a first groove is provided on both the outer wall and the inner wall of the housing. The first groove is connected to the snap-fit ​​hole. The outer end is bent to be embedded in the first wiring groove on the outer wall of the housing, and the inner end is bent to be embedded in the first wiring groove on the inner wall of the housing.

[0013] Furthermore, a sealing sleeve is fitted onto the intermediate main body.

[0014] Furthermore, the sealing sleeve is a waterproof sealing sleeve.

[0015] Furthermore, the housing is also provided with partitions, which are spaced apart between adjacent battery cells.

[0016] Furthermore, the sidewall of the partition is provided with a second groove for arranging the circuit harness of the charging and discharging circuit and the circuit harness of the replenishing circuit.

[0017] Furthermore, a voltage converter is provided between the power supply circuit and the external power supply terminal, and the voltage converter is electrically connected to the BDU component.

[0018] Furthermore, a control signal converter is provided between the BDU component and the voltage converter, and between the BDU component and the selection controller.

[0019] The beneficial effects of this utility model are:

[0020] 1. Before connecting the battery pack's charging circuit to an external charging device, the BMS component can detect and identify cells whose actual voltage value is lower than a set standard value. The BDU component can then control the branch switch on the charging branch line where the low-voltage cell is located to close according to the identification signal from the BMS component, thus making the charging branch line open. This allows the cell to be charged separately after being connected to an external charging device, thereby eliminating the voltage difference between the cells in the battery pack.

[0021] 2. Multiple charging circuits are provided. These multiple charging circuits can correspond to different battery modules in the entire battery pack, or connect to several cells in different areas. They are evenly distributed in different locations of the battery pack, avoiding the method of all wires being routed to one external terminal of the battery pack. This reduces the actual length of the circuit wires used and lowers wiring costs and difficulties.

[0022] 3. Both the external and internal terminals of the power supply external terminal are embedded in the first groove, which can effectively reduce the encroachment of the power supply external terminal on the internal and external space of the battery pack, so as to ensure the energy density of the battery pack and reduce the difficulty of battery pack installation.

[0023] 4. The charging circuit and the charging and discharging circuit in the battery pack are independent of each other and do not interfere with each other, so as to reduce the circuit failure rate and simplify the circuit configuration. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0025] Figure 1 This is a schematic diagram of the battery pack structure in this embodiment;

[0026] Figure 2 This is a structural diagram of the external power supply terminal in this embodiment;

[0027] 1-Housing, 11-Baffle, 2-BMS assembly, 3-BDU assembly, 4-Battery cell, 5-Power supply circuit, 51-Power supply main line, 52-Power supply branch line, 53-Power supply external terminal, 531-Intermediate main body, 532-External terminal, 533-Internal terminal, 534-Sealing sleeve, 54-Branch switch, 6-Selector controller, 7-Voltage converter, 8-Control signal converter. Detailed Implementation

[0028] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0029] First, it should be noted that existing battery packs all have charging and discharging circuits. Under the coordinated control of BMS component 2 and BDU component 3, the current charging and discharging circuits can generally only meet the needs of uniformly supplying power to multiple battery cells 4 or discharging multiple battery cells 4. However, if we want to selectively replenish the low-voltage battery cells 4 in the battery pack using the existing charging and discharging circuits, we need to modify the existing charging and discharging circuits. But this modification will make the existing charging and discharging circuits very complex. Furthermore, since the existing charging and discharging circuits basically only have one external interface, all the wiring harnesses of the modified charging and discharging circuits will have to be concentrated at a single external interface. This will further increase the difficulty of wiring harnesses and reduce the safety of the battery pack.

[0030] For this, please refer to Figure 1 and Figure 2 To solve the above-mentioned technical problems, unlike the existing technical solutions that modify the original charging and discharging circuit of the battery pack, this utility model provides a battery pack with a charging function in a specific embodiment. Taking a cuboid-shaped battery pack as an example, the battery pack includes a shell 1, a BMS component 2, a BDU component 3, and battery cells 4. The shell 1 is a cuboid, and multiple battery cells 4 are evenly arranged inside the shell 1. The BMS component 2 and the BDU component 3 are both arranged at the front end of the shell 1. The BMS component 2 and the BDU component 3 are electrically connected to the multiple battery cells 4 through the charging and discharging circuit, and the BMS component 2 and the BDU component 3 are also electrically connected to each other.

[0031] In this embodiment, the BMS component 2 is used to detect the actual voltage value of each cell 4 through the charging and discharging circuit, and the BDU component 3 is used to control the on and off of the charging and discharging circuit according to the detection signal of the BMS component 2. The specific wiring method of the charging and discharging circuit can refer to the prior art.

[0032] Additionally, please see Figure 1 In this embodiment, the battery pack further includes a charging circuit 5 and a selection controller 6. The charging circuit 5 includes a main charging line 51 and multiple charging branch lines 52. The housing 1 is provided with a charging external terminal 53. The main charging line 51 is connected to the charging external terminal 53. The multiple charging branch lines 52 are connected in parallel to the main charging line 51. Each charging branch line 52 is connected to one of the battery cells 4, and each charging branch line 52 is provided with a branch switch 54 for controlling the on / off state of the branch line. The selection controller 6 is electrically connected to the multiple branch switches 54, and the selection controller 6 is also electrically connected to the BDU assembly 3.

[0033] In response, when the BMS component 2 detects that there is a cell 4 in the battery pack with an actual voltage value lower than the set standard value, the BMS component 2 immediately sends the corresponding low-voltage cell 4 number to the BDU component 3 in the form of an electrical signal. After receiving the relevant detection signal, the BDU component 3 generates a control command. After receiving the control command, the selector controller 6 immediately controls the branch switch 54 on the charging branch line 52 connected to the low-voltage cell to close, so that the charging circuit 5 is connected only to the low-voltage cell 4. Then, the technician connects the charging external terminal 53 to the external charger to perform the charging operation on the low-voltage cell 4.

[0034] In this embodiment, the controller 6 can be a PLC controller, and the branch switch 54 is an electrical control switch.

[0035] Further, please refer to Figure 1 To simplify the power supply circuit 5, facilitate wiring, and avoid the situation where a single power supply circuit 5 becomes overly complex due to the need to connect all battery cells 4 simultaneously, in this embodiment, taking a battery pack with eight battery cells 4 as an example, there are two power supply circuits 5. Each power supply circuit 5 includes a main power supply line 51 and four branch power supply lines 52. Each of the four branch power supply lines 52 is connected to a battery cell 4. The main power supply lines 51 of both power supply circuits 5 are connected to a power supply external terminal 53. The two power supply external terminals 53 are symmetrically arranged on the left and right sides of the housing 1.

[0036] Further, please refer to Figure 1 In this embodiment, since the specific voltage values ​​of different battery cells 4 may be different, each charging circuit 5 is provided with a voltage converter 7 between itself and the corresponding charging external terminal 53. The voltage converter 7 can be specifically set on the charging main circuit. The voltage converter 7 is also electrically connected to the BDU component 3 so that, under the control of the BDU component 3, it can convert the input voltage of the charger according to the actual voltage value of the battery cell 4 to be charged, so that the input voltage of the charger and the actual voltage of the battery cell 4 to be charged are compatible with each other, thereby improving the charging rate.

[0037] In addition, in this embodiment, in order to prevent the voltage converter 7 and the selection controller 6 from being unable to recognize the control signals of the BDU component 3, a control signal converter 8 is provided between the voltage converter 7 and the BDU component 3, and between the selection controller 6 and the BDU component 3. The control signal converter 8 is specifically used to convert the control signals issued by the BDU component 3 into control commands that can be received and recognized by the voltage converter 7 or by the selection controller 6.

[0038] It should be noted that in practical applications, the number of battery cells 4 in a battery pack often exceeds eight. Correspondingly, the number of battery cells 4 connected in each charging circuit 5 and the number of charging circuits 5 can also vary depending on the actual situation.

[0039] Further, please refer to Figure 1 and Figure 2 The external power supply terminal 53 includes a middle body 531, an external terminal 532, and an internal terminal 533. A snap-fit ​​through hole is provided on the housing 1. The middle body 531 is a cylinder. A conductive post is provided axially on the inner side of the middle body 531. The upper end of the conductive post extends outward from the upper end of the middle body 531 to form the external terminal 532. The lower end of the conductive post extends outward from the lower end of the middle body 531 to form the internal terminal 533. An annular slot is also provided on the outer circumference of the middle body 531. The middle body 531 is snapped into the snap-fit ​​through hole through the annular slot. The internal terminal 533 bends from the inner opening of the snap-fit ​​through hole toward the inner wall of the housing 1 and is attached to the inner wall surface of the housing 1. The external terminal 532 bends from the outer opening of the snap-fit ​​through hole toward the outer wall of the housing 1 and is attached to the outer wall surface of the housing 1.

[0040] In this way, the protrusion volume of the external charging terminal 53 on the outer and inner walls of the housing 1 can be limited to a very small extent, so as to avoid the external charging terminal 53 protruding too much on the outer or inner walls of the housing 1, and to avoid affecting the actual installation of the battery pack or the arrangement of the battery cells 4 due to the external charging terminal 53 protruding too much.

[0041] Furthermore, in order to eliminate the protrusion formed by the external power supply terminal 53 on the housing 1, a first groove is provided on both the outer and inner walls of the housing 1, and the first grooves on the outer and inner walls of the housing 1 are connected to the snap-fit ​​hole. In this regard, a technician can bend the external terminal 532 into the first groove on the outer wall of the housing 1 and the internal terminal 533 into the first groove on the inner wall of the housing 1 to further eliminate the volumetric impact caused by the external terminal 532 protruding from the outer wall of the housing 1 and the internal terminal 533 protruding from the inner wall of the housing 1.

[0042] In addition, a sealing sleeve 534 made of waterproof material is also fitted on the intermediate body 531. The sealing sleeve 534 can be further clamped in the gap between the intermediate body 531 and the card connection hole to ensure the overall sealing performance of the battery pack.

[0043] Further, please refer to Figure 1 The housing 1 is also provided with a partition 11, which is used to separate different battery modules or different cells 4 to enhance the overall safety performance of the battery pack.

[0044] Moreover, Figure 1The upper end of the partition 11 corresponds to the tail end of the battery pack. In this embodiment, a second groove can also be formed on the side wall of the partition 11. The second groove extends from the tail end of the partition 11 to the front end of the partition 11. In this way, the connection harness between the voltage converter 7 and the BDU assembly 3, and the connection harness between the branch switch 54 and the selection controller 6 and the battery cell 4 can all be arranged in the second groove. A second groove is also formed on the inner wall of the housing 1. The second groove on the housing 1 extends from the tail end of the housing 1 to the head end of the housing 1. The connection harness between the BDU assembly 3 and the battery cell 4, and the connection harness between the BMS assembly 2 and the battery cell 4 are all arranged in the second groove on the housing 1.

[0045] Anything not mentioned above applies to existing technologies.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery pack having a function of supplying power, characterized by comprising: The battery pack comprises: The shell (1), the BMS assembly (2), the BDU assembly (3), the battery cell (4), the charging and discharging circuit, a plurality of battery cells (4) are installed in the shell (1), the BMS assembly (2) and the BDU assembly (3) are arranged in the shell (1), the BMS assembly (2) is electrically connected with the plurality of battery cells (4), the BDU assembly (3) is electrically connected with the plurality of battery cells (4), the BMS assembly (2) and the BDU assembly (3) are electrically connected; The battery pack further comprises: The power supply circuit (5) comprises a main power supply circuit (51) and a plurality of power supply branch circuits (52), the shell (1) is provided with a power supply external terminal (53), the main power supply circuit (51) is connected to the power supply external terminal (53), a plurality of power supply branch circuits (52) are connected in parallel to the main power supply circuit (51), each power supply branch circuit (52) is connected with the battery cell (4), and each power supply branch circuit (52) is provided with a branch switch (54) for controlling the on-off of the branch circuit. The selection controller (6) is electrically connected with the plurality of branch switches (54), and the selection controller (6) is also electrically connected with the BDU assembly (3).

2. The battery pack of claim 1, wherein, The power supply circuit (5) is provided with a plurality of power supply circuits (5), the plurality of power supply circuits (5) are uniformly arranged in the shell (1), and the power supply external terminals (53) of the plurality of power supply circuits (5) are uniformly distributed on the shell (1).

3. The battery pack of claim 2, wherein, The power supply external terminal (53) comprises an intermediate main body (531), an external terminal head (532) and an internal terminal head (533), a clamping through hole is formed in the shell (1), the intermediate main body (531) is clamped and installed in the clamping through hole, the external terminal head (532) is located outside the shell (1), and the internal terminal head (533) is located inside the shell (1).

4. The battery pack of claim 3, wherein, First recesses are formed in the outer wall and the inner wall of the shell (1), the first recesses are communicated with the clamping through hole, the external terminal head (532) is bent to be embedded in the first wiring recess on the outer wall of the shell (1), and the internal terminal head (533) is bent to be embedded in the first wiring recess arranged on the inner wall of the shell (1).

5. The battery pack of claim 4, wherein, A sealing sleeve (534) is arranged on the intermediate main body (531).

6. The battery pack of claim 5, wherein, The sealing sleeve (534) is a waterproof sealing sleeve.

7. The battery pack of claim 1, wherein, A partition plate (11) is further arranged in the shell (1), and the partition plate (11) is arranged between adjacent battery cells (4).

8. The battery pack of claim 7, wherein, Second recesses are arranged on the side wall of the partition plate (11) and used for arranging circuit harnesses of the charging and discharging circuit and the power supply circuit (5).

9. The battery pack of claim 1, wherein, A voltage converter (7) is further arranged between the power supply circuit (5) and the power supply external terminal (53), and the voltage converter (7) is electrically connected with the BDU assembly (3).

10. The battery pack of claim 9, wherein, A control signal converter (8) is arranged between the BDU assembly (3) and the voltage converter (7) and between the BDU assembly (3) and the selection controller (6).

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