CN110120475B

CN110120475B - Battery pack

Info

Publication number: CN110120475B
Application number: CN201810114045.XA
Authority: CN
Inventors: 朱燕; 孙铭远
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2018-02-05
Filing date: 2018-02-05
Publication date: 2021-01-19
Anticipated expiration: 2038-02-05
Also published as: CN110120475A

Abstract

The invention relates to the field of batteries, and discloses a battery pack, wherein the battery pack (1) comprises a battery unit (10), the battery unit (10) comprises a plurality of single batteries (100), each single battery (100) is provided with a connecting member (11), and the battery pack (1) further comprises a supporting member (12) which can be matched with the connecting members (11) to connect the connecting members (11) of the adjacent single batteries (100) with each other. The battery pack is provided with connecting members on the unit batteries, and is further provided with supporting members capable of being matched with the connecting members to connect the connecting members of the adjacent unit batteries with each other, so that the overall structure of the battery pack is firm.

Description

Battery pack

Technical Field

The invention relates to the field of batteries, in particular to a battery pack.

Background

Electric vehicles, namely electric drive vehicles, are also known as electric drive vehicles. Electric vehicles are classified into alternating current electric vehicles and direct current electric vehicles. Generally, an electric vehicle is a vehicle that uses a battery as an energy source, and converts electric energy into mechanical energy through a controller, a motor and other components to move so as to control the current and change the speed. The electric vehicle as a new energy green vehicle has obvious effects on the aspects of energy saving, environmental protection and the like, and is more and more widely applied.

In order to realize a higher endurance mileage function for an electric vehicle, a battery pack needs to be mounted on the electric vehicle such as an electric vehicle. A plurality of unit batteries are generally arranged in a battery pack to increase the specific capacity of the battery, wherein the plurality of unit batteries may be arranged and combined together in a certain manner. The single battery comprises a battery shell, a battery core packaged in the battery shell and an electrode terminal arranged on the battery shell.

At present, in order to lighten the battery pack, namely reduce the weight of the battery pack and improve the specific capacity of the battery pack, structural adhesive is generally selected to bond a plurality of single batteries to form the battery pack, but the structural adhesive is easy to lose efficacy and the internal structure of the battery pack is unstable because the battery pack is in a vibration state for a long time in the using process.

Disclosure of Invention

The invention aims to overcome the problem that the connection between the single batteries in the battery pack in the prior art is in an adhesion mode, so that the internal structure of the battery pack is unstable, and provides a battery pack.

In order to achieve the above object, an aspect of the present invention provides a battery pack including a battery unit including a plurality of unit batteries each having a connection member provided thereon, and a support member capable of cooperating with the connection member to connect the connection members of the adjacent unit batteries to each other.

Preferably, the connecting member has an insertion portion, and the supporting member has an insertion groove allowing the insertion portion to be inserted.

Preferably, the single battery is in a polyhedron structure, at least one side of the single battery is a connecting side, the connecting member is arranged on the connecting side, the connecting member comprises a guide plate arranged on the connecting side and a support piece connecting the connecting side and the guide plate, the tail end of the guide plate extends beyond the support piece, and the guide plate forms the insertion part;

the supporting member comprises a supporting column and a supporting plate protruding from the periphery of the supporting column, and the tail end of the supporting plate is provided with the slot inserted with the tail end of the guide plate.

Preferably, the connection member is provided at a corner of the unit cell, and the guide plates of adjacent sides of the corner form an integral structure and extend along the contour of the corner;

the supporting member comprises a plurality of supporting plates which are radially distributed along the circumferential direction of the supporting column, each supporting plate extends along the axial direction of the supporting column, and slots for inserting the tail ends of the guide plates which are positioned at the same corresponding corner are respectively arranged on the adjacent supporting plates.

Preferably, the connection member includes a main body portion and a transition portion connecting the main body portions, respectively, in parallel to the connection side, and the guide plate forms the main body portion.

Preferably, the single battery is in a cuboid structure;

the battery pack comprises a plurality of battery units, the single batteries are arranged in an array, every four adjacent corners of every two adjacent rows of the single batteries are provided with the connecting members, and four supporting plates are uniformly distributed along the circumferential direction of the supporting column.

Preferably, each of the unit cells is provided at a corner thereof at an edge of the battery pack with the connection member.

Preferably, the outer part of the connection member located at the edge of the battery pack is coated with an insulation member.

Preferably, the insulating member includes a first insulating member for covering one of the connecting members at the corners of the battery pack and a second insulating member for covering the adjacent two connecting members.

Preferably, the first insulating member includes a first insulating plate bent, and first slots into which the ends of the guide plates located at the same corner are inserted are respectively disposed at two ends of the first insulating plate.

Preferably, the second insulating member includes an insulating column and three second insulating plates radially distributed along a circumferential direction of the insulating column, each second insulating plate extends along an axial direction of the insulating column, second slots into which ends of the guide plates located at the same corner are inserted are respectively provided on adjacent second insulating plates, and one of the second insulating plates is located between two adjacent connecting members.

Preferably, the guide plate extends in a length direction of the unit battery; the insertion groove extends along the length direction of the single battery.

Preferably, the support member is an insulator.

In the above technical solution, by providing the connection member on each of the unit batteries and providing the support member capable of being engaged with the connection member in the battery pack, the connection members of the adjacent unit batteries can be connected to each other, so that the plurality of unit batteries in the battery pack can be arranged and combined together by the engagement between the support member and the connection member, and the entire structure of the battery pack is stable and firm. In addition, since the connecting members and the supporting members matched with the connecting members are only arranged on the single batteries, the overall weight of the battery pack is still small, so that the overall structure of the battery pack is stable, and the battery pack is easy to realize light weight.

Drawings

Fig. 1 is a schematic view of the overall structure of a battery pack according to a preferred embodiment of the present invention;

FIG. 2 is a schematic view of a portion of the structure shown at A in FIG. 1;

fig. 3 is a schematic perspective view of a unit cell of the battery pack shown in fig. 1;

FIG. 4 is a schematic side view of the cell shown in FIG. 3;

FIG. 5 is a schematic view of a portion of the structure shown at D in FIG. 4;

fig. 6 is a perspective view of a support member of the battery pack shown in fig. 1;

FIG. 7 is a side view of the support member shown in FIG. 6;

FIG. 8 is a schematic view of a portion of the structure shown at C in FIG. 1;

fig. 9 is an overall structural view of the second insulating member in the structure shown in fig. 8;

FIG. 10 is a schematic view of a portion of the structure shown at B in FIG. 1;

fig. 11 is an overall structural view of the first insulating member in the structure shown in fig. 10.

Description of the reference numerals

1-a battery pack; 10-a battery cell; 100-single battery; 11-a connecting member; 110-a guide plate; 111-a support; 112-a transition; 12-a support member; 120-support column; 121-a support plate; 122-slot; 130 — a first insulating member; 131-a second insulating member; 132 — a first insulating plate; 133-a second insulating plate; 134-a first slot; 135-insulating columns; 137-second slot.

Detailed Description

In the present invention, the use of directional terms such as "upper, lower, left and right" in the absence of a contrary intention, generally means that the terms "inside and outside" refer to the inside and outside of the outline of the component, both in conjunction with the orientation shown in the drawings and the orientation in actual use.

The invention provides a battery pack, wherein the battery pack 1 comprises a battery unit 10, the battery unit 10 comprises a plurality of single batteries 100, each single battery 100 is provided with a connecting member 11, and the battery pack 1 further comprises a supporting member 12 which can be matched with the connecting members 11 to connect the connecting members 11 of the adjacent single batteries 100 with each other. By providing the connecting member 11 on each of the unit batteries 100 and providing the supporting member 12 capable of cooperating with the connecting member 11 in the battery pack 1, it is possible to connect the connecting members 11 of the adjacent unit batteries 100 to each other, and thus, the plurality of unit batteries 100 in the battery pack 1 can be arranged together by the cooperation between the supporting member 12 and the connecting member 11, and the entire structure of the battery pack 1 is stable and firm. In addition, since the connection member 11 and the support member 12 that is engaged with the connection member 11 are provided only on the unit batteries 100, the overall weight of the battery pack 1 is still small, and thus, the overall structure of the battery pack 1 is not only stable, but also the battery pack 1 is easily lightweight. It should be noted that the supporting member 12 and the connecting member 11 can be engaged with each other by inserting, so that the single battery 100 can be easily disassembled and assembled, and the maintenance of the single battery 100 is also facilitated, for example, when a single battery 100 in the battery pack 1 is damaged, the single battery 100 can be extracted for repair or replacement.

Preferably, the connection member 11 may have an insertion portion, and the support member 12 may have an insertion groove 122 allowing the insertion portion to be inserted, such that the support member 12 can connect the connection members 11 of the adjacent unit batteries 100 to each other by the mutual engagement between the insertion portion and the insertion groove 122.

It is understood that the unit cell 100 may have a polyhedral structure, for example, may have a regular polyhedron, wherein at least one side of the unit cell 100 is a connection side, the connection member 11 may be disposed on the connection side, the connection member 11 may include a guide plate 110 disposed on the connection side and a support 111 connecting the connection side and the guide plate 110, an end of the guide plate 110 extends beyond the support 111, and the guide plate 110 forms the insertion portion. In addition, the support member 12 may include a support column 120 and a support plate 121 protruding from the outer circumference of the support column 120, and a slot 122 to be inserted into the end of the guide plate 110 may be provided at the end of the support plate 121. It can be understood that the connection members 11 of the adjacent unit batteries 100 can be connected to each other by inserting the guide plates 110 into the insertion grooves 122 provided at the ends of the support plates 121. It should be noted that the support member 12 may preferably be an insulating member, that is, the support member 12 may preferably be made of an electrically insulating material, so that the adjacent unit batteries 100 are insulated from each other, making the use of the battery pack 1 safer. In addition, the support member 12 may be formed as a unitary piece for ease of manufacture, while the support member 12 may be formed as a unitary structure for ease of installation and use.

As shown in fig. 3, the guide plates 110 may extend along the length direction L of the unit batteries 100, and it is understood that the insertion grooves 122 may also extend along the length direction L of the unit batteries 100 to cooperate with the corresponding guide plates 110, thereby making the structure of the entire battery pack 1 more stable, and it is understood that the adjacent unit batteries 100 are connected to each other in the length direction L. In addition, the support columns 120 and the support plates 121 may also extend in the length direction L of the unit batteries 100.

As shown in fig. 1, 3, 4 and 5 in conjunction with fig. 1, 3, 4 and 5, the connection member 11 may be provided at a corner of the unit battery 100, the guide plates 110 of adjacent sides of which form an integral structure and extend along the outline of the corner. Accordingly, as shown in fig. 2, 6 and 7, the support member 12 may include a plurality of support plates 121 radially distributed along the circumferential direction of the support column 120, each support plate 121 extends along the axial direction of the support column 120, and the adjacent support plates 121 are respectively provided with a slot 122 for inserting the end of the guide plate 110 corresponding to the same corner. The mutual fit between the connecting members 11 and the supporting members 12 having the above-described structure facilitates the assembly of the multi-cell batteries 100 into the battery pack 1, for example, when a plurality of single-cell batteries 100 are assembled, the connecting members 11 located at the corners of the single-cell batteries 100 can be inserted into the insertion grooves 122 of the corresponding supporting members 12. In addition, the provision of the connection members 11 at the corners of the unit batteries 100 may enable the support members 12 to connect more unit batteries 100 together, for example, as shown in fig. 1, one support member 12 may firmly connect four unit batteries 100 adjacent to each other in two adjacent rows to each other.

In order to further improve the firmness of the connecting member 11, the connecting member 11 may comprise a main portion and a transition portion 112 connecting the main portion, wherein the guide plate 110 may form the main portion, and wherein the guide plate 110 is connected by the transition portion 112 to form a single piece, whereby the overall structure of the connecting member 11 is more stable. As shown in fig. 5, the connection member 11 may be disposed at a corner of the unit battery 100 such that two guide plates 110 located at the same corner are connected by a transition portion 112, and the two guide plates 110 and the transition portion 112 are formed as an integrated structure. In addition, in order to further reduce the possibility of collision during the assembly of the unit battery 100, the transition portion 112 may be formed as a smooth transition portion.

Preferably, the unit cell 100 may have a rectangular parallelepiped structure, and it is understood that the battery pack 1 may include a plurality of battery units 10, such that the plurality of battery units 10 may be arranged and assembled into the battery pack 1, wherein the plurality of unit cells 100 may be arranged in an array, corners, adjacent to each other, of every four unit cells 100 adjacent to each other in two adjacent rows may be provided with the connecting members 11, and four supporting plates 121 are uniformly distributed along the circumferential direction of the supporting column 120, such that every four unit cells 100 adjacent to each other in two adjacent rows may be connected to each other. It is understood that, as shown in fig. 7, insertion grooves 122 are provided at both sides of each support plate 121, so that the connection members 11 of the corners adjacent to each other of every four unit batteries 100 adjacent to each other of the two adjacent rows are inserted into the corresponding insertion grooves 122. In addition, because a plurality of battery cells 100 in the battery pack 1 are assembled by the mutual insertion and matching between the connecting member 11 and the supporting member 12, a gap is formed between the adjacent battery cells 100, which is beneficial to the heat dissipation of the battery cells 100, and the battery pack 1 is not easy to deform due to the thermal expansion of the battery cells 100. It is to be noted that a heat insulating layer may be further provided in the gap formed between the adjacent unit batteries 100, and for example, heat insulating cotton may be used as the heat insulating layer.

As shown in fig. 1, the connection members 11 may be disposed at the corners of each unit battery 100 at the edges of the battery pack 1, which not only makes the entire structure of the battery pack 1 more stable, but also facilitates the provision of additional components on the battery pack 1 such that the battery pack 1 has better performance, for example, an insulation member may be coated on the outside of the connection members 11 at the edges of the battery pack 1 such that the battery pack 1 has good electrical insulation, such that the use of the battery pack 1 is safer.

As shown in fig. 1, 8 and 10 in combination, the insulating member includes a first insulating member 130 for covering one connecting member 11 at an edge of the battery pack 1 and a second insulating member 131 for covering two adjacent connecting members 11, that is, the first insulating member 130 covers the outside of one connecting member 11 at an edge of the battery pack 1, and the second insulating member 131 covers the outside of two adjacent connecting members 11 at an edge of the battery pack 1.

Further, as shown in fig. 10 and 11, the first insulating member 130 may include a first insulating plate 132 having a bent shape, and first slots 134 into which the ends of the guide plates 110 located at the same corner may be inserted may be respectively disposed at both ends of the first insulating plate 132. It is understood that the first insulating member 130 may be wrapped outside one of the connection members 11 located at the corners of the battery pack 1 by inserting the ends of the guide plates 110 into the corresponding first insertion grooves 134, respectively. Note that the guide plate 110 may extend in the longitudinal direction L of the unit battery 100; accordingly, the first insertion groove 134 may extend in the length direction L of the unit battery 100.

In addition, as shown in fig. 8 and 9, the second insulating member 131 may include an insulating column 135 and three second insulating plates 133 radially distributed along a circumferential direction of the insulating column 135, the second insulating member 131 may be T-shaped as a whole, each second insulating plate 133 extends along an axial direction of the insulating column 135, second insertion grooves 137 into which ends of the guide plates 110 corresponding to the same corner are inserted may be respectively provided on adjacent second insulating plates 133, and one second insulating plate 133 may be located between two adjacent connecting members 11 to facilitate the insertion of the end of the corresponding guide plate 110. Specifically, the second insulating plate 133 positioned in the middle may be provided at both sides thereof with second insertion grooves 137 so that the ends of the two guide plates 110 positioned between the adjacent two unit batteries 100 are respectively inserted, the remaining two second insulating plates 133 may be positioned substantially in the same plane, and the end of each second insulating plate 133 remote from the insulating column 135 may be provided with second insertion grooves 137 so that the ends of the guide plates 110 positioned on the adjacent two unit batteries 100 are respectively inserted. In addition, it is noted that the guide plate 110 may extend in the length direction L of the unit battery 100; accordingly, the second insertion groove 137 may extend in the length direction L of the unit battery 100.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims

1. A battery pack, characterized in that the battery pack (1) comprises a battery unit (10), the battery unit (10) comprises a plurality of unit batteries (100), a connecting member (11) is provided on each of the unit batteries (100), the battery pack (1) further comprises a supporting member (12) capable of cooperating with the connecting member (11) to connect the connecting members (11) of the adjacent unit batteries (100) to each other;

the connecting member (11) has an insertion portion, and the supporting member (12) has an insertion groove (122) allowing the insertion portion to be inserted;

the single battery (100) is in a polyhedral structure, at least one side face of the single battery (100) is a connecting side face, the connecting member (11) is arranged on the connecting side face, the connecting member (11) comprises a guide plate (110) arranged on the connecting side face and a support piece (111) for connecting the connecting side face and the guide plate (110), the tail end of the guide plate (110) extends beyond the support piece (111), and the guide plate (110) forms the insertion part;

the supporting member (12) comprises a supporting column (120) and a supporting plate (121) protruding from the periphery of the supporting column (120), and the end of the supporting plate (121) is provided with the insertion slot (122) inserted with the end of the guide plate (110).

2. The battery pack according to claim 1, wherein the connecting member (11) is provided at a corner of the unit battery (100), the guide plates (110) of adjacent sides of the corner forming an integral structure and extending along the contour of the corner;

the supporting member (12) comprises a plurality of supporting plates (121) which are radially distributed along the circumferential direction of the supporting column (120), each supporting plate (121) extends along the axial direction of the supporting column (120), and slots (122) for inserting the tail ends of the corresponding guiding plates (110) positioned at the same corner are respectively arranged on the adjacent supporting plates (121).

3. Battery pack according to claim 1, characterized in that the connecting member (11) comprises a main portion parallel to the connecting side and a transition portion (112) connecting the main portions, respectively, the guide plate (110) forming the main portion.

4. The battery pack according to claim 1, wherein the unit cells (100) have a rectangular parallelepiped structure;

the battery pack (1) comprises a plurality of battery units (10), the single batteries (100) are arranged in an array, every four adjacent corners of every two adjacent rows of the single batteries (100) are provided with the connecting members (11), and four supporting plates (121) are uniformly distributed along the circumferential direction of the supporting column (120).

5. The battery pack according to claim 4, wherein a corner of each unit battery (100) at an edge of the battery pack (1) is provided with the connection member (11).

6. The battery pack according to claim 5, wherein the outside of the connection member (11) located at the edge of the battery pack (1) is coated with an insulating member.

7. A battery pack according to claim 6, wherein the insulating members include a first insulating member (130) for covering one of the connecting members (11) at the corners of the battery pack (1) and a second insulating member (131) for covering the adjacent two connecting members (11).

8. The battery pack according to claim 7, wherein the first insulating member (130) includes a first insulating plate (132) having a bent shape, and both ends of the first insulating plate (132) are respectively provided with a first insertion groove (134) into which the ends of the guide plates (110) corresponding to the same corner are inserted.

9. The battery pack according to claim 7, wherein the second insulating member (131) includes an insulating column (135) and three second insulating plates (133) radially arranged along a circumferential direction of the insulating column (135), each of the second insulating plates (133) extends in an axial direction of the insulating column (135), and second slots (137) into which ends of the guide plates (110) corresponding to the same corner are inserted are respectively provided in adjacent second insulating plates (133), and one of the second insulating plates (133) is located between two adjacent connecting members (11).

10. The battery pack according to claim 1, wherein the guide plate (110) extends in a length direction of the unit batteries (100); the insertion groove (122) extends along the length direction of the single battery (100).

11. Battery pack according to any of claims 1-10, characterized in that the support member (12) is an insulator.