Lithium battery pack comprising external BMS board

Abstract

Disclosed in the present invention is a lithium battery pack comprising an external BMS board, comprising a battery cell group, a battery case, a BMS board, and a BMS protective cover. The battery cell group is mounted in the battery case, the BMS protective cover is mounted on one outer wall of the battery case, a BMS board mounting space is formed between the BMS protective cover and the battery case, and the BMS board is mounted in the BMS board mounting space and is electrically connected to the battery cell group in the battery case. According to the present invention, the impact of heat generated in the charging and discharging processes of the battery cell group on the working performance of the BMS board can be reduced.

Description

Lithium battery pack with external BMS plate TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium batteries, in particular to a lithium battery pack with an external BMS plate. BACKGROUND

[0002] The lithium battery energy storage pack usually uses a plastic shell as a box to fix and protect the battery cells. A flexible material is usually used for buffering and fixing between the box and the battery cells, or a screw is used for positioning and fixing. End plates are usually provided on both sides of the battery cells to fix the battery cells, reduce battery expansion, and improve battery performance and service life, but this will increase the volume of the battery.

[0003] The BMS is fixed inside the box and connected with the battery collection line and power line. Due to the relatively closed structure of the box, the heat generated by the battery cells and the BMS during high-current operation cannot be exchanged with the outside in time, which reduces the performance and safety of the battery. SUMMARY

[0004] The purpose of the present application is to provide a lithium battery pack with an external BMS plate, which solves the technical problem of reducing the influence of heat generated during the charging and discharging process of the battery cell group on the working performance of the BMS plate.

[0005] To achieve the above purpose, the solution of the present application is: a lithium battery pack with an external BMS plate, comprising a battery cell group, a battery box, a BMS plate and a BMS shield, the battery cell group is installed in the battery box, a BMS shield is installed on an outer wall of the battery box, a BMS plate installation space is formed between the BMS shield and the battery box, the BMS plate is installed in the BMS plate installation space and electrically connected with the battery cell group in the battery box.

[0006] Further, the BMS shield is provided with a heat dissipation opening for connecting the BMS plate installation space with the outside, and a guardrail is further formed on the heat dissipation opening, and a gap is formed on the guardrail for airflow to pass through but not for fingers to extend into.

[0007] Further, the BMS plate comprises a BMS plate body and a heat dissipation plate, the BMS plate body is installed on the heat dissipation plate, the heat dissipation plate faces the heat dissipation opening, and heat dissipation fins are formed on the side facing the heat dissipation opening.

[0008] Further, at least part of the side wall of the battery box is made of aluminum alloy material, and a handle is fixed on the top side of the side wall made of aluminum alloy material.

[0009] Further, the battery box is composed of a bottom shell, a front side plate, a rear side plate, a left side plate, a right side plate and an upper cover, the battery cell group is placed on the bottom shell, the front side plate, the rear side plate, the left side plate and the right side plate surround the battery cell group, and the upper cover covers the battery cell group, so as to seal the battery cell group in the battery box, the bottom shell and the upper cover are made of plastic material, and the front side plate, the rear side plate, the left side plate and the right side plate are made of aluminum alloy material.

[0010] Further, flexible extrusion plates are clamped between the outer wall of the battery cell group and the inner wall of the battery box, or flexible pressing plates are clamped between each battery cell of the battery cell group, and barley paper is clamped between the outer wall of the battery cell group and the inner wall of the battery box.

[0011] Further, the flexible extrusion plates are made of EVA foam material.

[0012] Further, the BMS plate is fixed on the BMS shield and spaced from the battery box.

[0013] Further, a silica gel pad is clamped between the BMS plate and the BMS shield.

[0014] Further, a handle is arranged on the top side of the battery box.

[0015] Further, a BMS insulating plate is further covered and mounted on the position of the outer wall of the battery box where the BMS shield is mounted, and the BMS insulating plate is arranged between the battery box and the BMS plate.

[0016] After the above scheme is adopted, the beneficial effects of the present application are as follows:

[0017] (1) The battery cell group is installed in the battery box, a BMS shield is mounted on an outer wall of the battery box, a BMS plate installation space is formed between the BMS shield and the battery box, and the BMS plate is installed in the BMS plate installation space, so as to separate the battery cell group and the BMS plate, to reduce the heat conduction from the battery cell group to the BMS plate during the working process of the battery cell group, and only the BMS shield needs to be dismounted to expose the BMS plate, so as to protect the BMS plate and facilitate the maintenance of the BMS plate;

[0018] (2) The BMS shield is provided with a heat dissipation opening which communicates the BMS plate installation space with the outside, the BMS plate can exchange heat with the cold air outside through the heat dissipation opening, and the heat dissipation of the BMS plate is further enhanced;

[0019] (3) Part of the side walls of the battery box are made of aluminum alloy material, the aluminum alloy material can better conduct the heat in the battery box to the outside of the battery box, and accelerate the heat dissipation of the battery cell group in the battery box;

[0020] (4) The flexible extrusion plate is clamped between the outer wall of the battery cell group and the inner wall of the battery box, so that the gap between the outer wall of the battery cell group and the inner wall of the battery box during replacement of the battery cell group is offset by the flexible extrusion plate, that is, the replaced battery cell group is subjected to appropriate extrusion force. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is an exploded view of the present application;

[0022] Fig. 2 is an exploded view of the BMS shield and the BMS plate before installation;

[0023] Fig. 3 is a perspective view of the present application;

[0024] Fig. 4 is a sectional view of the present application;

[0025] Fig. 5 is a sectional view of the present application in another direction;

[0026] Fig. 6 is a schematic view of the battery cell group in which a flexible extrusion plate is clamped between each battery cell constituting the battery cell group.

[0027] Reference numerals: 1-battery cell group, 2-battery box, 3-BMS plate, 4-BMS shield, 5-BMS plate installation space, 6-heat dissipation port, 7-bottom shell, 8-front side plate, 9-rear side plate, 10-left side plate, 11-right side plate, 12-upper cover, 13-flexible extrusion plate, 14-BMS plate body, 15-heat dissipation plate, 16-heat dissipation fin, 17-handles, 18-guardrail, 19-battery module insulation plate, 20-BMS insulation plate, 21-battery cell, 22-highland barley paper, 23-silica gel pad. Embodiment of the present application

[0028] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] In the claims, specification, and above drawings of the present application, unless otherwise expressly limited, by terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. are used to indicate the orientation or positional relationship only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, so it cannot be understood as limiting the specific protection scope of the present application.

[0030] The application provides a lithium battery pack with an external BMS plate, as shown in Figures 1-5, which comprises a battery cell group 1, a battery box 2, a BMS plate 3 and a BMS shield 4. The battery cell group 1 is installed in the battery box 2. The shape of the battery box 2 is not limited as long as it can accommodate the battery cell group 1. A BMS shield 4 is installed on an outer wall of the battery box 2. The BMS shield 4 is preferably in the form of a square groove and is integrally screwed to the side wall of the battery box 2 through screws. Of course, other mounting and fixing structures such as clamping or bonding can also be used, which are not limited. After installation, the BMS shield 4 and the battery box 2 form a BMS plate mounting space 5 (shown in Figure 4), the BMS plate 3 is installed in the BMS plate mounting space 5 and electrically connected to the battery cell group 1 in the battery box 2 to manage and control the charging and discharging process of the battery cell group 1 in the battery box 2 (this is a common technical means in the art, which will not be described in detail in this embodiment). Through the above scheme, the battery cell group 1 and the BMS plate 3 are separated to reduce the heat conduction from the battery cell group 1 to the BMS plate 3 during the working process of the battery cell group 1. Only the BMS shield 4 needs to be removed to expose the BMS plate 3, which can protect the BMS plate 3 and facilitate the maintenance of the BMS plate 3.

[0031] To further enhance the heat dissipation of the BMS plate 3, preferably in the embodiment, the BMS shield 4 is provided with a heat dissipation opening 6 which communicates the BMS plate mounting space 5 with the outside. The heat dissipation opening 6 is preferably located on the side of the BMS shield 4 which faces away from the battery box 2. To fully protect the BMS plate 3 from damage caused by external force, more preferably, a guardrail 18 is further formed on the heat dissipation opening 6. The guardrail 18 is provided with a gap through which air flows and through which fingers cannot be inserted, so as to avoid the hands from being inserted and accidentally touching the high-temperature devices inside, causing burns.

[0032] To further enhance the heat dissipation of the BMS plate 3, preferably in the embodiment, the BMS plate 3 comprises a BMS plate body 14 and a heat dissipation plate 15. The BMS plate body 14 is installed on the heat dissipation plate 15. The heat dissipation plate 15 faces the heat dissipation opening 6 and is provided with heat dissipation fins 16 on the side facing the heat dissipation opening 6. Thus, the heat generated by the BMS plate 3 is conducted to the heat dissipation plate 15. The heat dissipation area of the heat dissipation plate 15 is increased by the design of the heat dissipation fins 16, so that the heat can be quickly dissipated from the heat dissipation opening 6 to the outside air, enhancing the heat dissipation effect of the BMS plate 3.

[0033] In order to further enhance the heat dissipation of the BMS plate 3, preferably in the embodiment, the BMS plate 3 is fixed on the BMS shield 4 and spaced from the battery box 2, so as to further weaken the heat conduction between the battery cell group 1 and the BMS plate 3; in order to fully insulate and insulate, more preferably, the outer wall of the battery box 2 is also covered with a BMS insulation plate 20 at the position where the BMS shield 4 is installed, the BMS insulation plate 20 is separated between the battery box 2 and the BMS plate 3, and the BMS plate 3 and the BMS shield 4 are also clamped with a silica gel pad 23, which separates the BMS plate 3 and the BMS shield 4.

[0034] Since most of the existing battery boxes 2 are made of plastic material, the heat dissipation of the battery cell group in the battery box 2 is poor, in order to avoid this problem, in the embodiment, preferably, at least part of the side wall of the battery box 2 is made of aluminum alloy material, the top side of the aluminum alloy material is fixed with a handle 17, so as to effectively reduce the stress of the plastic upper cover 12, and the structure is more stable; more specifically in the embodiment, the battery box 2 is composed of a bottom shell 7, a front side plate 8, a rear side plate 9, a left side plate 10, a right side plate 11 and an upper cover 12 connected by screws, the battery cell group 1 is placed on the bottom shell 7, the front side plate 8, the rear side plate 9, the left side plate 10 and the right side plate 11 are surrounded around the battery cell group 1, and the upper cover 12 is covered above the battery cell group 1 to seal the battery cell group 1 in the battery box 2, the bottom shell 7 and the upper cover 12 are made of plastic material, the front side plate 8, the rear side plate 9, the left side plate 10 and the right side plate 11 are made of aluminum alloy material, and specifically the top side of the front side plate 8 and the rear side plate 9 is respectively fixed with a handle 17, the aluminum alloy material of the front side plate 8 and the rear side plate 9 not only can play a role as a shell to protect the internal components, but also can play a role of improving the heat dissipation effect and extruding the internal battery cell group 1.

[0035] In one embodiment, a flexible extrusion plate 13 is clamped between the outer wall of the battery cell group 1 and the inner wall of the battery box 2, specifically, a flexible extrusion plate 13 is clamped between the front side plate 8, the rear side plate 9, the left side plate 10 and the right side plate 11 and the front, rear, left and right side walls of the battery cell group 1 respectively; in another embodiment, focusing on the flexible extrusion plate 13 shown in Figure 6, a flexible extrusion plate 13 is arranged between each battery cell 21 of the battery cell group 1, and a barley paper 22 is clamped between the outer wall of the battery cell group 1 and the inner wall of the battery box 2; more preferably, the flexible extrusion plate 13 is made of EVA foam material, so that the flexible extrusion plate 13 has sufficient support, shock absorption and temperature resistance effect, and also plays a role of providing expansion and replaceable space for the battery cell group 1.

[0036] The battery cell group 1 and the upper cover 12 are isolated by a battery module insulation plate 19, the battery module insulation plate 19 is fixed on the battery cell group 1 by gluing, so as to play a role of insulation, avoiding the electrode contact at the top of the battery cell group 1 from leaking electricity to the outside world.

[0037] In order to facilitate the lifting of the battery box 2, preferably, the top side of the battery box 2 is further provided with a handle 17, preferably two handles 17 are provided and are spaced apart on the top surface of the battery box 2.

[0038] The above description is only the preferred embodiment of the present application, and is not a limitation on the design of the present application. Any equivalent changes made according to the key design of the present application fall within the scope of protection of the present application.

Claims

1. A lithium battery pack with an external BMS board, characterized in that: It comprises a battery cell group (1), a battery box (2), a BMS board (3) and a BMS shield (4), the battery cell group (1) is installed in the battery box (2), a BMS shield (4) is installed on an outer wall of the battery box (2), a BMS board installation space (5) is formed between the BMS shield (4) and the battery box (2), the BMS board (3) is installed in the BMS board installation space (5) and electrically connected with the battery cell group (1) in the battery box (2).

2. The lithium battery pack with an external BMS board of claim 1, wherein: A heat dissipation opening (6) is formed on the BMS shield (4) to communicate the BMS board installation space (5) with the outside, and a guardrail (18) is further formed on the heat dissipation opening (6), the guardrail (18) is formed with a gap for airflow to pass through but not for fingers to insert.

3. The lithium battery pack with an external BMS board of claim 2, wherein: The BMS board (3) comprises a BMS board body (14) and a heat dissipation plate (15), the BMS board body (14) is installed on the heat dissipation plate (15), the heat dissipation plate (15) faces the heat dissipation opening (6) and is formed with heat dissipation fins (16) on the side facing the heat dissipation opening (6).

4. The lithium battery pack with an external BMS board of claim 1, wherein: At least part of the side wall of the battery box (2) is made of aluminum alloy material, and a handle (17) is fixed on the top side of the side wall made of aluminum alloy material.

5. The lithium battery pack with an external BMS board of claim 1, wherein: The battery box (2) is composed of a bottom shell (7), a front side plate (8), a rear side plate (9), a left side plate (10), a right side plate (11) and an upper cover (12), the battery cell group (1) is placed on the bottom shell (7), the front side plate (8), the rear side plate (9), the left side plate (10) and the right side plate (11) surround the battery cell group (1), and the upper cover (12) covers the battery cell group (1) to seal the battery cell group (1) in the battery box (2), the bottom shell (7) and the upper cover (12) are made of plastic material, and the front side plate (8), the rear side plate (9), the left side plate (10) and the right side plate (11) are made of aluminum alloy material.

6. The lithium battery pack with an external BMS board of claim 1, wherein: A flexible extrusion plate (13) is clamped between the outer wall of the battery cell group (1) and the inner wall of the battery box (2), or a flexible extrusion plate (13) is clamped between each battery cell (21) of the battery cell group (1), and a barley paper (22) is clamped between the outer wall of the battery cell group (1) and the inner wall of the battery box (2).

7. The lithium battery pack with an external BMS board of claim 6, wherein: The flexible extrusion plate (13) is made of EVA foam material.

8. The lithium battery pack with an external BMS board of claim 1, wherein: The BMS board (3) is fixed on the BMS shield (4) and spaced from the battery box (2).

9. The lithium battery pack with an external BMS board of claim 8, wherein: A silica gel pad (23) is clamped between the BMS board (3) and the BMS shield (4).

10. The lithium battery pack with an external BMS board of claim 1, wherein: A BMS insulating plate (20) is further installed on the outer wall of the battery box (2) at the position where the BMS shield (4) is installed, and the BMS insulating plate (20) is interposed between the battery box (2) and the BMS board (3).

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