CN219321494U - Battery pack - Google Patents

Abstract

A battery pack, comprising: the first shell and the second shell form a hollow cylindrical shell; the battery cell group is arranged in the shell and comprises a first battery cell group and a second battery cell group which are oppositely arranged, the first battery cell group and the second battery cell group are arranged along the axial direction of the shell, and the first battery cell group and the second battery cell group comprise at least two battery cells which are stacked together; BMS plates arranged in the housing, the BMS plates being arranged parallel to the axial direction of the housing; the BMS board is electrically connected with the battery cells through the adapter board, and the protruding ends of the lugs of the battery cells face the adapter board. The battery is cylindrical in whole, can be conveniently arranged in cylindrical electrical equipment, can effectively utilize the structural space of a product, and improves the space utilization rate.

Description

Battery pack

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a cylindrical soft package battery pack.

Background

The battery module is a common application mode in the field of new energy batteries. The battery module generally includes a plurality of battery cells, and desired voltages are obtained between the battery cells through parallel connection or series connection. The current soft package battery cell is generally square, and the battery pack formed by stacking the battery cells is also correspondingly square. However, some handheld home appliances have a cylindrical shape such as a handheld cleaner, a floor washing machine, etc., and in order to achieve miniaturization of the appliances by effectively using space, there is a need for a battery to be placed at a position of a handle of the appliance, etc. However, the shape of the square battery pack is not matched with the shape of the cylindrical product, so that the internal space of the product is difficult to fully utilize, and therefore, the cylindrical battery pack is designed to improve the space utilization rate of the battery in the electrical product and ensure the safety and reliability of the battery.

Disclosure of Invention

The utility model aims to provide a cylindrical soft package battery pack.

In order to achieve the above object, the present utility model adopts the following technical solutions:

a battery pack, comprising: the first shell and the second shell form a hollow cylindrical shell; the battery cell group is arranged in the shell and comprises a first battery cell group and a second battery cell group which are oppositely arranged, the first battery cell group and the second battery cell group are arranged along the axial direction of the shell, and the first battery cell group and the second battery cell group comprise at least two battery cells which are stacked together; BMS plates arranged in the housing, the BMS plates being arranged parallel to the axial direction of the housing; the BMS board is electrically connected with the battery cells through the adapter board, and the protruding ends of the lugs of the battery cells face the adapter board.

According to the technical scheme, the battery provided by the utility model adopts the hollow cylindrical shell, the plurality of electric cores are stacked to form the first electric core group and the second electric core group respectively, the first electric core group and the second electric core group are oppositely arranged in the shell along the axial direction of the shell, the electric core groups are axially arranged along the shell, the electric core groups are electrically connected with the BMS plate through the adapter plates positioned between the oppositely arranged electric core groups, the BMS plate and the electric core groups are arranged in parallel, and the overall shape of the battery is cylindrical, so that the battery can be conveniently arranged in cylindrical electrical equipment, the structural space of a product can be effectively utilized, and the space utilization rate is improved.

As described above, optionally, the first casing and the second casing are both arc-shaped casings, a first end plate is disposed at one axial end of the first casing, a second end plate is disposed at one axial end of the second casing, and the first end plate and the second end plate are respectively located at two axial ends of the casing; the first end plate and the second end plate are provided with ventilation holes.

Above scheme sets up the ventilation hole on the end plate, makes the inside air channel that can form of shell, is favorable to the circulation of air current, ventilates heat dissipation to electric core and BMS board, reduces electric core group temperature, promotes battery radiating efficiency and thermal security to support the bigger multiplying power of battery to discharge.

As described above, optionally, the inner wall of the first housing and/or the inner wall of the second housing is provided with a support rib, and the battery cell group is disposed on the support rib.

According to the scheme, the supporting ribs are arranged, so that the battery cell group can be effectively fixed, and the battery cell group is prevented from shifting in the shell to influence the battery performance.

As described above, the battery pack may optionally be provided with a first spacer between the battery cell pack and the support rib.

The battery pack is characterized in that a second separator is arranged between the battery cell group and the first end plate and between the battery cell group and the second end plate, and the second separator is provided with a vent hole.

Above scheme can prevent that other parts from causing mechanical damage to the electric core through setting up the spacer, promotes the mechanical safety performance of battery.

The battery pack comprises a first battery cell group and a second battery cell group, wherein the first battery cell group comprises at least two soft package battery cells stacked together, and one section or a plurality of sections of buffer foam arranged at intervals are arranged between the adjacent battery cells; the structure of the second battery cell group is the same as that of the first battery cell group.

In the scheme, the buffer foam not only can absorb the expansion of the battery cells and buffer the mechanical external force, but also can form a certain gap between the battery cells, thereby facilitating the circulation of air flow and being beneficial to the heat dissipation of the battery cells.

The battery pack as described above, optionally, the first battery cell group further includes a binding tape sleeved on the periphery of the first battery cell group.

In the scheme, the battery cell group adopts the binding adhesive tape to bind the battery cells stacked together, so that the battery cells can only compress buffer foam among the battery cells inwards when expanding, and can not expand outwards, and the battery cell expansion can be prevented from occupying the space of the BMS board.

As described above, the battery pack may optionally be provided with a first spacer between the BMS board and the battery cell pack.

Above scheme can prevent that other parts from causing mechanical damage to the electric core through setting up the spacer, promotes the mechanical safety performance of battery.

As described above, optionally, the two side surfaces of the adapter plate are respectively provided with a first tab pad and a second tab pad, the adapter plate is provided with a first ear and a second ear protruding outwards, the first ear is provided with a total positive pad, the second ear is provided with a total negative pad, and the total positive pad and the total negative pad are located on the two side surfaces of the adapter plate; the BMS board is provided with a slot for the first lug and the second lug to pass through, the first lug and the second lug pass through the slot and are exposed out of the first surface of the BMS board, the first surface of the BMS board is provided with a positive bonding pad and a negative bonding pad, the positive bonding pad is electrically connected with the total positive bonding pad through an electric connecting sheet, and the negative bonding pad is electrically connected with the total negative bonding pad through an electric connecting sheet; the electric connection piece has first connecting portion and second connecting portion, first connecting portion with BMS board electricity is connected, second connecting portion with the keysets electricity is connected, second connecting portion is the bending structure of reverse U-shaped, second connecting portion detains on the ear of keysets.

In the scheme, the BMS plate and the adapter plate are vertically arranged at 90 degrees, so that the process capability of the welding process of the electric connection sheet is improved, and the process operability and the yield are improved.

The battery pack is characterized in that the adapter plate is provided with a vent groove; and/or, the electric connection sheet is provided with a positioning pin, the BMS board is provided with a positioning jack corresponding to the positioning pin, and the positioning pin can be inserted into the positioning jack.

Above scheme sets up the ventilation groove on the change piece, is favorable to the circulation of air current in the shell inside, convenient heat dissipation. The positioning pins and the positioning jacks are respectively arranged on the electric connecting sheet and the BMS plate, so that the electric connecting sheet and the BMS plate can be conveniently assembled and positioned, and the manufacturing process difficulty is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model, the following description will briefly explain the embodiments or the drawings required for the description of the prior art, it being obvious that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.

Fig. 1 is a schematic structural view of a battery pack according to an embodiment of the present utility model;

fig. 2 is a schematic view of a battery pack according to an embodiment of the present utility model with a casing detached;

FIG. 3 is an exploded view of a battery pack according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of the battery cell and the BMS board assembled together according to an embodiment of the present utility model;

fig. 5 is an exploded view of a battery cell and a BMS board according to an embodiment of the present utility model;

fig. 6 is a schematic structural view of the BMS board and the adapter board, and the electrical connection sheet according to the embodiment of the present utility model when assembled together;

fig. 7 is a schematic structural diagram of an adapter plate according to an embodiment of the present utility model;

FIG. 8 is a schematic view of another angle of the adapter plate according to the embodiment of the present utility model;

fig. 9 is a schematic structural view of an electrical connection sheet according to an embodiment of the present utility model.

The following describes the embodiments of the present utility model in further detail with reference to the drawings.

Detailed Description

In describing embodiments of the present utility model in detail, the drawings showing the structure of the device are not to scale locally for ease of illustration, and the schematic illustrations are merely examples, which should not limit the scope of the utility model. It should be noted that the drawings are in simplified form and are not to scale precisely, but rather are merely intended to facilitate and clearly illustrate the embodiments of the present utility model. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance or implying the number of technical features indicated; the terms "forward," "reverse," "bottom," "upper," "lower," and the like are used for convenience in describing and simplifying the description only, and do not denote or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, 2 and 3, the battery pack of the present embodiment includes a housing 1, a battery cell group including a first battery cell group 2 and a second battery cell group 3, a BMS (Battery Management System ) board 4, and an adapter board 5. The shell 1 is hollow cylinder, and the battery cell group, the BMS plate 4 and the adapter plate 5 are all arranged in the shell 1. The casing 1 of this embodiment is composed of a first casing 1-1 and a second casing 1-2, the first casing 1-1 and the second casing 1-2 are arc-shaped casings, and the first casing 1-1 and the second casing 1-2 can be assembled together through threaded fasteners. When the first housing 1-1 and the second housing 1-2 are combined together, a hollow cylindrical housing is formed. A first end plate 1-3 is provided at one end of the first housing 1-1 in the axial direction, a second end plate 1-4 is provided at one end of the second housing 1-2 in the axial direction, and the first end plate 1-3 and the second end plate 1-4 are located at both ends of the housing 1 in the axial direction, respectively. In a specific embodiment, the length of the housing 1 may be 100mm to 350mm and the diameter may be 20mm to 600mm.

Optionally, in order to facilitate heat dissipation of the battery pack, the first end plate 1-3 and the second end plate 1-4 are respectively provided with a ventilation hole a, and the ventilation holes a at two ends of the casing 1 may enable the inside of the casing 1 to form a warm air channel for heat dissipation of the battery. The shape and number of the vent holes a may be set according to the need, for example, one or more vent holes a may be provided on the end plate, the vent holes a may be circular, square, triangular, etc., and the shape and number of the vent holes are not limited. Optionally, in order to better fix the battery cell group, a support rib 1-5 is disposed on the inner wall of the first casing 1-1 and/or the inner wall of the second casing 1-2, and the first battery cell group 2 and the second battery cell group 3 are placed on the support rib 1-5 and supported by the support rib 1-5. The support ribs 1-5 of the embodiment are arranged at intervals along the axial direction of the housing 1, and gaps are formed between the support ribs 1-5, so that the battery cell group can conveniently dissipate heat and ventilate in the housing 1. Further, a first isolation sheet 6 is arranged between the first battery cell group 2 and the supporting ribs 1-5 (the shell 1), a first isolation sheet 6 is also arranged between the second battery cell group 3 and the supporting ribs 1-5 (the shell 1), the first isolation sheet 6 can play a supporting and protecting role on the battery cell group, the force of the supporting ribs 1-5 on the battery cell group can be dispersed, the direct contact between the battery cells and the supporting ribs 1-5 can be prevented, and the mechanical damage to the battery cells of the battery cell group caused by the supporting ribs 1-5 is avoided. In addition, a second spacer 7 may be disposed at the end in the axial direction of the cell group, and a vent a is also disposed on the second spacer 7 as in the present embodiment between the first end plate 1-3 and the second cell group 3 and between the second end plate 1-4 and the first cell group 2. In a specific embodiment, the first spacer 6 and the second spacer 7 may be glass fiber board, PC sheet, PET sheet, or the like. The spacer can be provided with adhesive on one side and is adhered to the surface of the battery cell group. The first cell group 2 and the second cell group 3 attached with the first spacer 6 can be fixed together by glue or double-sided adhesive tape and the support ribs 1-5. The shapes, sizes and numbers of the first isolation sheets 6 and the second isolation sheets 7 are correspondingly set according to the shapes and sizes of the battery cell groups.

The first battery cell group 2 and the second battery cell group 3 are oppositely arranged along the axial direction of the shell 1, the adapter plate 5 is arranged between the first battery cell group 2 and the second battery cell group 3, the first battery cell group 2 and the second battery cell group 3 have the same structure and comprise at least two soft package battery cells 8 which are stacked together, for example, 2, 4, 6 soft package battery cells and the like, the tab protruding end (the tab protruding end of the battery cell) of the battery cell 8 faces the adapter plate 5, namely, the tab 8a of the battery cell 8 extends to the adapter plate 5, so that the tab 8a and the tab pad on the adapter plate 5 are welded together conveniently. The BMS plates 4 are arranged parallel to the axial direction of the housing 1, i.e. the BMS plates 4 extend parallel to the axial direction of the housing 1. In order to fully utilize the space in the housing 1, the BMS board 4 is parallel to the surface of the side of the battery pack where the area is largest. Optionally, in order to avoid mechanical damage to the battery cells caused by the BMS board 4, a first spacer 6 is also arranged between the BMS board 4 and the first battery cell group 2 and the second battery cell group 3. Preferably, the double-sided adhesive tape 12 is used for fixing the isolating sheet and the BMS plate, the thickness of the double-sided adhesive tape can be 0.05-0.6 mm, the interval between the isolating sheet and the BMS plate can be increased by the double-sided adhesive tape, and the heat conduction of the BMS plate 4 to the battery core is reduced.

As shown in fig. 4 and 5, the first battery cell group 2 and the second battery cell group 3 of the present embodiment each include two battery cells 8, and the first battery cell group 2 and the second battery cell group 3 have the same structure, and the structure of the first battery cell group 2 will be described below by taking the first battery cell group 2 as an example. The first cell group 2 comprises two cells 8 stacked in the thickness direction of the cells, each cell 8 is provided with a tab 8a extending out of the cell from one end of the cell, and tab extending ends of the two cells 8 are located on the same side and face the adapter plate 5. The adapter plate 5 is provided with a tab pad for welding the tab, the tab pad can be a nickel block, the tab 8a of the battery cell 8 and the tab pad on the adapter plate 5 are welded together, and the battery cells can be connected in parallel or in series according to requirements so as to obtain the required voltage. Optionally, a buffer foam 9 is disposed between adjacent cells 8 in the first cell group 2, where the buffer foam 9 is used to absorb expansion of the cells 8 and buffer mechanical external force. Besides the buffering function, the buffering foam 9 also has a certain thickness, and the buffering foam 9 which is arranged in a multi-section interval mode is arranged between the adjacent electric cores, so that a certain gap can be formed between the electric cores 8, a certain air flow gap can be formed between the electric cores 8, air flow is facilitated, and heat dissipation of the electric cores is achieved. Further, the first electric core group 2 further comprises at least one binding adhesive tape 10, the binding adhesive tape 10 is sleeved on the periphery of the first electric core group 2, a certain binding force is formed on the electric cores 8 stacked together, the expansion direction of the electric cores 8 can be bound, the expansion wires of the electric cores 8 can inwards compress the buffer foam 9, and the electric cores 8 are prevented from expanding outwards. The structure of the second battery cell group 3 is the same as that of the first battery cell group 2, and the description of the structure of the first battery cell group 2 can be referred to, and the description is omitted here.

As shown in fig. 6, the BMS board 4 and the adaptor board 5 of the present embodiment are electrically connected through an electrical connection piece 11. The adapter plate 5 is positioned between the first cell group 2 and the second cell group 3, and the adapter plate 5 is vertical to the BMS plate 4. For convenience of assembly, the present embodiment is provided with a slot 4a on the BMS board 4 through which the ear of the adapter board 5 is inserted. Positive and negative electrode pads are provided on the first surface of the BMS board 4. The first surface of the BMS board 4 is a side surface of the BMS board 4 remote from the battery cell group.

As shown in fig. 7 and 8, two side surfaces of the adapter plate 5 in this embodiment are respectively provided with a first tab pad 5a electrically connected to the tab of the battery in the first battery cell group 2 and a second tab pad 5b electrically connected to the tab of the battery in the second battery cell group 3, where the number of tab pads corresponds to the number of battery tabs. The adapter plate 5 has a pair of outwardly projecting ears: a first ear portion 5c and a second ear portion 5d. The first ear 5c and the second ear 5d can pass through the slot 4a of the BMS board 4 and are exposed on the first surface of the BMS board 4. The first ear portion 5c is provided with a total positive bonding pad 5e, the second ear portion 5d is provided with a total negative bonding pad 5f, and the total positive bonding pad 5e and the total negative bonding pad 5f are respectively located on both side surfaces of the interposer 5. The total positive pads 5e and the total negative pads 5f are used for electrical connection with the positive and negative pads of the BMS board 4. Optionally, ventilation grooves 5g are formed in two sides of the adapter plate 5 and can be used as ventilation channels, normal ventilation from the head to the tail of the battery is guaranteed, and ventilation and heat dissipation of the battery pack are achieved. The ventilation slot 5g may also be provided at other positions of the adapter plate 5, for example in the middle of the adapter plate 5, etc., when the space is suitable.

As shown in fig. 8, the electrical connection piece 11 of the present embodiment has a first connection part 11-1 electrically connected to the BMS board 4 and a second connection part 11-2 electrically connected to the adapter board 5, wherein the second connection part 11-2 has an inverted U-shaped bent structure. The electric connection sheet 11 can be a copper sheet, a nickel sheet, a copper sheet nickel plating and other conductive sheets. The second connection portion 11-2 may be fastened to the ear portion of the adapter plate 5 and soldered to the (total positive and total negative) pads on the ear portion. Optionally, the electrical connection piece 11 is provided with a positioning pin 11-3, and the BMS board 4 is provided with a positioning insertion hole 4b corresponding to the positioning pin 11-3, and the positioning pin 11-3 can be inserted into the positioning insertion hole 4 b. The positioning pins 11-3 are matched with the positioning jacks 4b, so that the electric connection piece 11 and the BMS plate 4 can be conveniently assembled and positioned, and the processing difficulty is reduced.

The utility model adopts the hollow cylindrical shell, the first battery cell group and the second battery cell group are respectively formed after a plurality of battery cells are stacked, the first battery cell group and the second battery cell group are oppositely arranged in the shell along the axial direction of the shell, and the whole shape of the battery is cylindrical, so that the battery can be conveniently arranged in cylindrical electrical equipment, the structural space of the product can be effectively utilized, and the space utilization rate is improved. The first battery cell group and the second battery cell group are arranged in pairs, the number of the first battery cell group and the second battery cell group arranged in the shell can be correspondingly changed according to requirements, for example, two or more than two groups of oppositely arranged first battery cell group and second battery cell group can be arranged. In the preferred embodiment, be provided with the ventilation hole on the end plate at shell both ends for the shell is inside to form the air channel of circulation air current, and the air current can flow through electric core, BMS board, and when the battery high multiplying power was discharged, the existence of air channel can carry out quick cooling to electric core, BMS board effectively, promotes the radiating efficiency of battery, promotes the thermal security and the charge-discharge multiplying power of battery.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A battery pack, comprising:

the first shell and the second shell form a hollow cylindrical shell;

the battery cell group is arranged in the shell and comprises a first battery cell group and a second battery cell group which are oppositely arranged, the first battery cell group and the second battery cell group are arranged along the axial direction of the shell, and the first battery cell group and the second battery cell group comprise at least two battery cells which are stacked together;

BMS plates arranged in the housing, the BMS plates being arranged parallel to the axial direction of the housing;

the BMS board is electrically connected with the battery cells through the adapter board, and the protruding ends of the lugs of the battery cells face the adapter board.

2. The battery pack of claim 1, wherein: the first shell and the second shell are arc-shaped shells, a first end plate is arranged at one axial end of the first shell, a second end plate is arranged at one axial end of the second shell, and the first end plate and the second end plate are respectively positioned at two axial ends of the shell; the first end plate and the second end plate are provided with ventilation holes.

3. The battery pack of claim 2, wherein: the battery cell assembly comprises a first shell and is characterized in that support ribs are arranged on the inner wall of the first shell and/or the inner wall of the second shell, and the battery cell assembly is arranged on the support ribs.

4. A battery pack as in claim 3, wherein: and a first isolation sheet is arranged between the battery cell group and the support rib.

5. The battery pack of claim 2, wherein: and a second isolation sheet is arranged between the battery cell group and the first end plate and between the battery cell group and the second end plate, and a vent hole is arranged on the second isolation sheet.

6. The battery pack of claim 1, wherein: the first battery cell group comprises at least two soft package battery cells stacked together, and one section or a plurality of sections of buffer foam arranged at intervals are arranged between the adjacent battery cells; the structure of the second battery cell group is the same as that of the first battery cell group.

7. The battery pack of claim 6, wherein: the first battery cell group further comprises a binding adhesive tape sleeved on the periphery of the first battery cell group.

8. The battery pack of claim 1, wherein: and a first isolation sheet is arranged between the BMS plate and the battery cell group.

9. The battery pack of claim 1, wherein: the two side surfaces of the adapter plate are respectively provided with a first lug bonding pad and a second lug bonding pad, the adapter plate is provided with a first lug and a second lug which protrude outwards, the first lug is provided with a total positive bonding pad, the second lug is provided with a total negative bonding pad, and the total positive bonding pad and the total negative bonding pad are positioned on the two side surfaces of the adapter plate;

the BMS board is provided with a slot for the first lug and the second lug to pass through, the first lug and the second lug pass through the slot and are exposed out of the first surface of the BMS board, the first surface of the BMS board is provided with a positive electrode bonding pad and a negative electrode bonding pad, the positive electrode bonding pad is electrically connected with the total positive bonding pad through an electric connecting sheet, and the negative electrode bonding pad is electrically connected with the total negative bonding pad through an electric connecting sheet;

the electric connection piece has first connecting portion and second connecting portion, first connecting portion with BMS board electricity is connected, second connecting portion with the keysets electricity is connected, second connecting portion is the bending structure of reverse U-shaped, second connecting portion detains on the ear of keysets.

10. The battery pack of claim 9, wherein: a ventilation groove is formed in the adapter plate;

and/or, the electric connection sheet is provided with a positioning pin, the BMS board is provided with a positioning jack corresponding to the positioning pin, and the positioning pin can be inserted into the positioning jack.

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