CN211295224U

CN211295224U - Battery pack and device using battery pack as power supply

Info

Publication number: CN211295224U
Application number: CN202020261559.0U
Authority: CN
Inventors: 陈玉超; 戴晓汕
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2020-03-05
Filing date: 2020-03-05
Publication date: 2020-08-18
Anticipated expiration: 2030-03-05

Abstract

The utility model relates to a battery pack and a device using the battery pack as a power supply, wherein the battery pack comprises more than two battery modules, a bus bar and a bus bar cover, and the more than two battery modules are electrically connected through the bus bar; the bus bar cover covers ends of the bus bars for insulating the bus bars, the bus bar cover having an opening through which the bus bars are electrically connected with the battery modules, the bus bar cover restricting relative movement with the bus bars through the opening. Be different from prior art, because the utility model discloses a structure of busbar lid is when the battery package bumps and warp, and the busbar lid can be torn along with the electric connection point of busbar together, still can effectively prevent busbar electric leakage short circuit, and the security is higher.

Description

Battery pack and device using battery pack as power supply

Technical Field

The utility model relates to an energy storage equipment technical field, in particular to group battery and use device of group battery as power.

Background

The electric connection point between the existing bus bar and the battery pack is insulated and protected by a hard plastic shell bus bar protective cover, and the bus bar protective cover adopts the modes of clamping, adhesive tape sticking and bolt fixing to solve the problem of looseness and abnormal sound of the bus bar protective cover.

In the using process, under the condition that the battery pack is extruded and deformed, the bus bar cover falls off or cracks under the pulling action of the bus bar, so that the bus bar cover loses the insulation protection function, the exposed bus bar is subjected to electric leakage short circuit, the battery pack is caused to self-ignite, and safety accidents are caused.

SUMMERY OF THE UTILITY MODEL

Therefore, it is desirable to provide a battery pack and a device using the battery pack as a power source, which are used for solving the technical problem that the bus bar protection cover is easy to fall off or crack under the pulling action of the bus bar in the prior art.

To achieve the above object, the inventors provide a battery pack including:

two or more battery modules;

a bus bar through which two or more of the battery modules are electrically connected; and

a bus bar cover covering an end of the bus bar to insulate the end of the bus bar, the bus bar cover having an opening through which the bus bar is electrically connected with the battery module, the bus bar cover restricting relative movement with the bus bar through the opening.

As a preferable structure of the present invention, the position of the opening is set at a side where the bus bar cover is close to the bus bar electrical connection point.

As a preferable structure of the present invention, the shape of the opening is adapted to the shape of the bus bar.

As a preferred structure of the present invention, the opening faces the height direction of the bus bar cover, the bus bar includes a passing through the open-ended middle section, the middle section is followed the height direction of the bus bar cover extends.

As a preferable structure of the present invention, the opening has a hollow portion extending in the bus bar direction all around.

As a preferred structure of the utility model, the busbar lid includes spacing portion, lower spacing portion, go up spacing portion with spacing portion sets up relatively down, go up spacing portion with spacing portion forms down the opening, go up spacing portion with spacing portion mutually support be used for right the busbar carries on spacingly.

As a preferred structure of the utility model, the tip of busbar pass through the connecting piece with the battery module electricity is connected, the busbar lid including cover in insulating on the connecting piece emits.

As a preferred structure of the utility model, joint portion has in the insulating emits, the insulating emits through joint portion with the top of connecting piece is fixed.

As a preferred structure of the utility model, the busbar lid still includes around insulating portion all around is emitted in the insulation, insulating portion is used for covering the tip of busbar, the shape of insulating portion is planar structure or cover body structure.

Unlike the prior art, the above technical solution covers the ends of the bus bars by a bus bar cover to insulate the ends of the bus bars, the bus bar cover having an opening through which the bus bars are electrically connected with the battery modules, the bus bar cover restricting relative movement with the bus bars through the opening. At this moment, in the use, when the battery package bumps and warp, the busbar lid can be torn along with the electric connection point of busbar together, still can effectively prevent busbar electric leakage short circuit, and the security is higher.

To achieve the above object, the inventors also provide an apparatus using a battery pack as a power source, comprising:

the battery pack according to any one of the above-mentioned inventors.

Drawings

FIG. 1 is a schematic view of an apparatus according to an embodiment;

FIG. 2 is a three-dimensional block diagram of a battery pack according to an embodiment;

FIG. 3 is an exploded view of a battery pack according to an embodiment;

fig. 4 is a top view of a battery pack according to an embodiment;

fig. 5 is a side view of a battery pack according to an embodiment;

FIG. 6 is an enlarged detail view taken at A in FIG. 3;

FIG. 7 is an exploded view of the bus bar cover of FIG. 6;

FIG. 8 is a cross-sectional view of the bus bar cover of FIG. 6;

FIG. 9 is an enlarged detail view at B in FIG. 3;

FIG. 10 is an exploded view of the bus bar cover of FIG. 9;

FIG. 11 is a cross-sectional view of the bus bar cover of FIG. 9;

fig. 12 is a schematic structural view of another bus bar cover;

fig. 13 is a schematic cross-sectional view of another bus bar cover.

Description of reference numerals:

1. a battery pack;

11. a battery module;

111. a battery pack top cover;

12. a bus bar;

121. a middle section;

13. a bus bar cover;

131. an insulating cap;

1311. a clamping part;

132. an opening;

1321. a hollow portion;

1322. an upper limit portion;

1323. a lower limiting part;

133. an insulating section;

14. a connecting member;

15. a box body;

2. a vehicle body.

Detailed Description

To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, including two, unless specified or indicated otherwise; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described with reference to the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

For a better understanding of the present application, embodiments of the present application are described below with reference to fig. 1 to 13.

The embodiment of the application provides a device using a secondary battery as a power supply. The device may be, but is not limited to, a vehicle, a ship, an aircraft, or the like. Referring to fig. 1, one embodiment of the present application provides a vehicle that includes a vehicle main body 2 and a battery pack 1. The battery pack 1 is provided in a vehicle body. The vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle. The vehicle body is provided with a drive motor electrically connected to the battery pack 1. The battery pack 1 supplies electric power to the driving motor. The driving motor is connected with wheels on the vehicle body through a transmission mechanism, so that the automobile is driven to move. Alternatively, the battery pack 1 may be horizontally disposed at the bottom of the vehicle body.

Referring to fig. 2 to 5, the present embodiment relates to a battery pack 1, where the battery pack 1 includes a box 15 and battery modules 11 disposed in the box 15, and one battery module 11 or more than two battery modules 11 may be disposed in the box 15, and may be selected according to actual situations, and the present embodiment does not limit the number of the battery modules 11 in the box 15.

The battery module 11 includes a plurality of secondary batteries. The battery module 11 is provided in various manners, and in one embodiment, the battery module 11 includes a receiving part and a plurality of secondary batteries in the receiving part. The plurality of secondary batteries are arranged side by side in the housing portion. The accommodating part is arranged in various ways, for example, the accommodating part comprises a shell and a cover plate covering the shell; alternatively, the receiving portion comprises a side plate and an end plate which are sequentially connected in a surrounding manner; alternatively, the receiving portion includes end plates disposed opposite to each other and a band surrounding the end plates and the secondary battery.

In the present embodiment, the battery pack 1 includes two or more battery modules 11, bus bars 12, and bus bar covers 13, the two or more battery modules 11 are electrically connected to each other through the bus bars 12, the bus bar covers 13 are provided at both ends of the bus bars 12, and the bus bar covers 13 cover the ends of the bus bars 12 to insulate the bus bars 12.

In this embodiment, five battery modules 11 are disposed in the box body 15, the five battery modules 11 are connected in series through the bus bar 12, and two ends of the bus bar 12 are both provided with a bus bar cover 13, which is insulated from each other, so as to prevent the bus bar 12 from leaking electricity and causing accidents.

It should be noted that, the two battery modules 11 can be connected in parallel with each other through the bus bar 12, or the bus bar cover 13 is only disposed at one end of the bus bar 12, which can be adjusted according to practical application, and the above situations are all within the protection scope of the present embodiment.

In this embodiment, in order to meet the requirement of the withstand voltage class of the battery pack 1, the thickness of the weakest part of the bus bar cover 13 is H ≥ k 1U/α (where U is the voltage of the battery pack 1, and may be obtained by measuring the output voltage of the battery pack 1 with a voltmeter or by adding the voltages of each secondary battery in actual production, α is a material withstand voltage coefficient, and may be obtained by examining a material property table or experimental measurement, for example, the dielectric strength of a modified EPDM is 15Kv/mm, k1 is a safety factor, and the value range is k1>1, and the larger the value is, the larger the safety margin is designed, and the smaller the safety margin is, and the smaller the thickness of the weakest part of the bus bar cover 13 in this embodiment needs to be greater than or equal to 1.5mm through experiments.

In this embodiment, to ensure the safety and reliability of the bus bar cover 13 under high temperature conditions, the melting point T of the bus bar cover 13 is recommended to be not less than k²T (wherein T is the highest temperature measured when the bus bar electrical connection point is used and can only be obtained through equivalent experimental measurement of the temperature rise of the connection point; T is the highest use critical temperature of the bus bar cover 13 and can be obtained through checking a material attribute table or experimental measurement, for example, the critical use temperature of EPDM rubber is 150 ℃; k is²The value range is 0-1 for the safety factor, and the larger the value is, the smaller the design safety margin is; conversely, the larger the temperature), it is experimentally found that the melting point of the bus bar cover 13 in the present embodiment needs to be 120 ℃ or higher. The bus bar cover 13 may be made of EPDM, silicone rubber, or the like, so as to meet the requirements of elasticity and insulation.

As shown in fig. 6 to 13, the bus bar cover 13 of the present embodiment includes an insulation cap 131 covering an electrical connection point of the bus bar 12, an opening 132 for allowing the bus bar 12 to pass through, and an insulation portion 133 surrounding the insulation cap 131, and the bus bar cover 13 restricts relative movement with the bus bar 12 through the opening 132. When the battery pack 1 is used, the bus bar 12 penetrates through the opening 132, and is electrically connected with the battery module 11, when the battery pack 1 is deformed due to collision, the bus bar cover 13 can be torn off along with the electrical connection point of the bus bar 12, the bus bar 12 can still be effectively prevented from being electrically leaked and shorted, and the safety is higher.

Alternatively, the position of the opening 132 is set on the side of the bus bar cover 13 near the electrical connection point of the bus bar 12. In other embodiments, the position of the opening 132 may be arbitrarily set on the bus bar cover 13; preferably, in the present embodiment, the position of the opening 132 is set on the side of the bus bar cover 13 near the electrical connection point of the bus bar 12. Thus, when the battery pack 1 is collided and vibrated, the force point of the opening 132 to the bus bar 12 is closer to the electrical connection point of the bus bar 12, and the relative movement between the bus bar cover 13 and the bus bar 12 can be better restricted.

Optionally, the shape of the opening 132 is adapted to the shape of the bus bar 12. In other embodiments, the shape of the opening 132 may not be the same as the shape of the bus bar 12, and even the shape of the opening 132 may be larger than the shape of the bus bar 12; preferably, the shape of the opening 132 is adapted to the shape of the bus bar 12, where the size and shape of the adapted finger are the same, and the shape of the opening 132 is adjusted accordingly for different shapes of the bus bar 12, so as to better limit the relative movement between the bus bar cover 13 and the bus bar 12 and prevent the short circuit of the bus bar 12.

Alternatively, as shown in fig. 6 to 8, in the present embodiment, the opening 132 of the bus bar cover 13 is a rectangular opening, and the width of the rectangular opening is adapted to the width of the bus bar 12. The opening 132 faces the height direction of the bus bar cover (the direction indicated by the arrow z in the drawing), and the bus bar 12 includes the intermediate section 121 passing through the opening 132, the intermediate section 121 extending in the height direction of the bus bar cover (the direction indicated by the arrow z in the drawing). At this time, the opening 132 can restrict the relative movement of the bus bar cover 13 and the bus bar 12 in the height direction (the direction indicated by the arrow z in the drawing) of the bus bar cover 13.

Optionally, the bus bar cover 13 further includes an insulating cap 131 covering the electrical connection point of the bus bar 12, and no matter whether the end of the bus bar 12 is electrically connected to the output end of the battery module 11 by riveting, welding, or the connection member 14, the insulating cap 131 may be fixed to the top of the electrical connection point by the clamping portion 1311, so as to cover the electrical connection point of the bus bar 12 and insulate the electrical connection point.

In this embodiment, in order to guarantee the reliability that insulating cap 131 and electrical connection point joint, the suggestion: m D is not less than D and not more than n D, h1 is not less than h2-1mm (wherein D is the inner diameter of the insulation cap 131, D is the outer diameter of the top of the electric connection point, m and n are coefficients for ensuring the clamping between the insulation cap 131 and the top of the electric connection point, the smaller n is, the larger m is, the higher the clamping force is, mn is in the value range of 0-1, and m is less than n; h1 is the distance between the top of the electric connection point and the installation outer surface of the bus bar/lead terminal, and h2 is the distance between the inner top surface of the clamping part 1311 of the insulation cap 131 and the installation outer surface of the bus.

In this embodiment, the end of the bus bar 12 may be electrically connected to the output end of the battery module 11 by riveting, welding, or the like, as long as the battery modules 11 and the battery modules 11 can be connected in parallel or in series.

Alternatively, in the present embodiment, the ends of the bus bars 12 are fixed to the output ends of the battery modules 11 by means of the connectors 14. Correspondingly, the insulating cap 131 is internally provided with a clamping portion 1311 which is matched with the connecting piece 14, and the insulating cap 131 is fixed with the head of the electric connecting piece 14 through the clamping portion 1311. At this time, the bus bar cover 13 is fixed to the head of the connecting member 14 by the engaging portion 1311, so that the bus bar cover 13 can be mounted more easily, and is not loosened or lost due to vibration during use. Specifically, the clamping portion 1311 and the head portion of the electrical connector 14 may be fixed to each other by interference fit, snap connection, or the like.

Alternatively, as shown in fig. 6 and 7, the ends of the bus bars 12 are fixed to the output ends of the battery modules 11 by two connecting members 14, and accordingly, the bus bar cover 13 includes two insulating caps 131, and the two insulating caps 131 are arranged in line with the actual positions of the two connecting members 14.

It should be noted that the number and the positions of the connecting members 14 are not limited in this embodiment, as long as the end of the bus bar 12 can be fixed on the output end of the battery module 11, and correspondingly, the number and the positions of the caps 131 are not limited in this embodiment, and the number of the caps 131 may be one or more than two, and all of them are within the protection scope of this embodiment.

Optionally, the cross-sectional shape of the insulating cap 131 in the vertical direction is circular or polygonal. Since the shape of the head of the connecting member 14 is circular or hexagonal, the shape of the cap 131 is adjusted according to the shape of the head of the connecting member 14 during actual use, and the shape of the cap 131 is not limited in this embodiment.

Alternatively, as shown in fig. 9 to 11, in the present embodiment, the bus bar cover 13 includes an insulation cap 131 covering the electrical connection point of the bus bar 12, an opening 132 for allowing the bus bar 12 to pass through, and an insulation portion 133 surrounding the insulation cap 131. At this time, the bus bar 12 is fixed to the output end of the battery module 11 by a connecting member 14, and the bus bar cover 13 is provided with only one insulating cap 131. The bus bar 12 has a cylindrical shape, and the opening 132 is a circular opening having a hollow portion 1321 extending in the direction of the bus bar 12 around the circular opening. The hollow portion 1321 serves to insulate an exposed portion in the vicinity of an electrical connection point of the bus bar 12, preventing the bus bar 12 from leaking electricity.

In this embodiment, the opening 132 of the bus bar cover 13 is a rectangular opening or a circular opening, so that the bus bar 12 or the cable can pass through, and the bus bar cover 13 can be prevented from being loosened and dropped due to vibration.

In some embodiments, as shown in fig. 12 to 13, the bus bar cover 13 includes an insulation cap 131 covering an electrical connection point of the bus bar 12, an opening 132 for allowing the bus bar 12 to pass through, and an insulation portion 133 surrounding the insulation cap 131. At this time, the bus bar 12 is fixed to the output end of the battery module 11 by one connector 14, the bus bar cover 13 is provided with only one insulating cap 131, and the insulating part 133 has a cover structure. The exposed part of the bus bar 12 is covered by the cover structure, and the bus bar 12 is prevented from electric leakage.

Alternatively, as shown in fig. 13, the bus bar cover 13 includes an upper retainer 1322 and a lower retainer 1323, the upper retainer 1322 and the lower retainer 1323 are disposed opposite to each other, the upper retainer 1322 and the lower retainer 1323 form the opening 132, and the upper retainer 1322 and the lower retainer 1323 cooperate with each other to retain the bus bar 12. At this time, the bus bar 12 passes through the opening 132, and the bus bar 12 is restricted by the upper stopper 1322 and the lower stopper 1323, which can effectively prevent the bus bar cover 13 from being loosened and dropped due to vibration.

Optionally, as shown in fig. 6 to 13, the bus bar cover 13 further includes an insulating portion 133 surrounding the insulating cap 131, the insulating portion 133 is used to cover the end portion of the bus bar 12, and the insulating portion 133 is shaped as a plane structure (as shown in fig. 6 or 9), or the insulating portion 133 is shaped as a cover structure (as shown in fig. 12). The insulating portion 133 has an area larger than an area of an electrical connection point at an end of the bus bar 12, and the insulating portion 133 serves to insulate the bus bar 12 except for the electrical connection point. It is to be noted that the shape and size of the insulating portion 133 may be changed according to the shape and size of the bus bar 12, and is not limited to the structure described in the embodiment.

In use, the bus bar cover 13 is pre-installed on the end of the bus bar 12, the end of the bus bar 12 is locked by the connector 14, the bus bar 12 is electrically connected to the battery module 11 through the opening 132, and the bus bar cover 13 restricts relative movement with the bus bar 12 through the opening 132.

Different from the prior art, in this embodiment, when the battery pack 1 is deformed in a collision manner, the bus bar cover 13 can be torn off along with the electrical connection point of the bus bar 12, so that the leakage short circuit of the bus bar 12 can be still effectively prevented, and the safety is higher.

It should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, the changes and modifications of the embodiments described herein, or the equivalent structure or equivalent process changes made by the contents of the specification and the drawings of the present invention, directly or indirectly apply the above technical solutions to other related technical fields, all included in the protection scope of the present invention.

Claims

1. A battery pack, comprising:

two or more battery modules;

2. The battery pack according to claim 1, characterized in that: the position of the opening is disposed at a side of the bus bar cover close to the bus bar electrical connection point.

3. The battery pack according to claim 1, characterized in that: the shape of the opening is matched with the shape of the bus bar.

4. The battery pack according to any one of claims 1 to 3, wherein: the opening faces a height direction of the bus bar cover, and the bus bar includes a middle section passing through the opening, the middle section extending in the height direction of the bus bar cover.

5. The battery pack according to any one of claims 1 to 3, wherein: the periphery of the opening is provided with a hollow part extending along the bus bar direction.

6. The battery pack according to any one of claims 1 to 3, wherein: the bus bar cover comprises an upper limit part and a lower limit part, the upper limit part and the lower limit part are arranged oppositely, the upper limit part and the lower limit part form the opening, and the upper limit part and the lower limit part are matched with each other to limit the bus bar.

7. The battery pack according to any one of claims 1 to 3, wherein: the end of the bus bar is electrically connected with the battery module through a connecting piece, and the bus bar cover comprises an insulating cap covering the connecting piece.

8. The battery pack according to claim 7, characterized in that: the insulation cap is provided with a clamping portion therein, and the insulation cap passes through the clamping portion and the top of the connecting piece is fixed.

9. The battery pack according to claim 7, characterized in that: the bus bar cover further comprises an insulating part surrounding the periphery of the insulating cap, the insulating part is used for covering the end part of the bus bar, and the insulating part is of a plane structure or a cover body structure.

10. An apparatus using a battery pack as a power source, comprising:

the battery pack according to any one of claims 1 to 9.