CN220821840U - Battery pack - Google Patents

Abstract

The utility model belongs to the technical field of new energy, and particularly relates to a battery pack, which comprises the following components: the tray comprises a bottom plate, wherein first side beams are arranged at two opposite edges of the bottom plate along a first direction; two opposite edges of the bottom plate along the second direction are provided with second side beams; a bus bar and battery units, wherein a plurality of battery units are arranged on the bottom plate along the first direction; the first output electrode and the second output electrode of the battery unit are arranged in the areas far away from the two first side beams. According to the utility model, the output electrode of the battery is arranged at a position far away from the edge of the battery pack, so that on one hand, the distance between the output electrode and a bus port of electrical equipment can be shortened, the length of the tab is reduced, and further, the weight and cost of the tab are reduced, and on the other hand, the tab is prevented from being damaged when the edge of the battery pack is deformed, and further, the phenomena of short circuit, arc discharge and the like of the tab are avoided, and the safety is improved.

Description

Battery pack

Technical Field

The utility model belongs to the technical field of new energy, and particularly relates to a battery pack.

Background

The output poles of the conventional strip-shaped batteries are generally arranged at the end parts of the batteries, when the batteries are packaged into a battery pack, the end parts of the batteries are generally arranged towards two side beams of a battery pack tray, the output poles of a plurality of batteries are connected to electrical equipment through tabs (also called bus bars), and the weight and cost of the tabs are increased due to the fact that the distance between the output poles and bus ports of the electrical equipment is long; in addition, when the battery pack is assembled to the vehicle body, the side rail is close to the edge of the vehicle body, so that the area near the side rail is easily deformed when the vehicle collides, and the tab is damaged due to extrusion, so that the risk of arc discharge or short circuit is caused.

Disclosure of utility model

In view of the above-described drawbacks of the prior art, an object of the present utility model is to provide a battery pack and a battery module that can reduce the risk of breakage of a bus bar, and that can reduce the weight and cost.

To achieve the above and other related objects, the present utility model provides a battery pack comprising:

The tray comprises a bottom plate, wherein first side beams are arranged at two opposite edges of the bottom plate along a first direction; the two opposite edges of the bottom plate along the second direction are provided with second side beams, wherein the first direction and the second direction are mutually perpendicular or are arranged at an included angle;

A busbar; and

The battery units are arranged on the bottom plate along the first direction; the first output electrode and the second output electrode of each battery unit are arranged in the areas far away from the two first side beams, and the first output electrode and the second output electrode of each battery unit are connected in series or in parallel through the bus bars respectively.

In an alternative embodiment of the present utility model, the output electrode is disposed at a central position in the longitudinal direction of the battery cell.

In an alternative embodiment of the present utility model, each of the battery units includes a plurality of battery cells connected in series with each other, each of the battery cells is stacked into at least two battery cell stacks, each of the battery cell stacks is disposed at intervals along the second direction, and the first output electrode and the second output electrode are disposed between two adjacent battery cell stacks; the battery cell unit comprises one or a plurality of battery cells which are mutually connected in parallel.

In an alternative embodiment of the present utility model, the battery unit includes at least a first sub-stack and a second sub-stack disposed adjacently, and the first sub-stack and the second sub-stack include m cell groups stacked sequentially along a preset direction, respectively;

An nth cell group of the first sub-stack body in the preset direction is electrically connected with the adjacent end of an (n+1) th cell group of the second sub-stack body in the preset direction, wherein n is less than m;

An m-th cell group of the first sub-stack body in the preset direction is adjacent to one end of the second sub-stack body and is electrically connected with the first output electrode, and a 1-th cell group of the second sub-stack body in the preset direction is adjacent to one end of the first sub-stack body and is electrically connected with the second output electrode;

The ith and the (i-1) th battery cell groups of the first sub-stack body in the preset direction are electrically connected with one end of the second sub-stack body far away from the second sub-stack body; and the ith and the (i-1) th battery cell groups of the second sub-stack body in the preset direction are electrically connected with one end of the battery cell group far away from the first sub-stack body, wherein i is less than or equal to m, and i is an even number.

In an alternative embodiment of the present utility model, the battery cell group includes a plurality of battery cells connected in series along the second direction, and the battery cell includes one or a plurality of battery cells connected in parallel to each other.

In an alternative embodiment of the present utility model, the predetermined direction is identical to the first direction.

In an alternative embodiment of the utility model, the predetermined direction coincides with a normal to the base plate.

In an alternative embodiment of the present utility model, each of the cells in the same battery unit is enclosed in a housing.

In an alternative embodiment of the present utility model, an opening is disposed on a top surface of the housing, and the opening is disposed between two adjacent stacks of the cells, so that the first output electrode and the second output electrode are exposed.

In an alternative embodiment of the utility model, the opening extends to a side wall of the housing to form a channel for receiving the busbar.

In an alternative embodiment of the present utility model, a beam is provided on the bottom plate, the beam is fixedly connected with the bottom plate, and a length direction of the beam is consistent with the second direction.

The utility model has the technical effects that: according to the utility model, the output electrode of the battery is arranged at a position far away from the edge of the battery pack, so that on one hand, the distance between the output electrode and a bus port of electrical equipment can be shortened, the length of the tab is reduced, and further, the weight and cost of the tab are reduced, and on the other hand, the tab is prevented from being damaged when the edge of the battery pack is deformed, and further, the phenomena of short circuit, arc discharge and the like of the tab are avoided, and the safety is improved.

Drawings

Fig. 1 is a perspective view of a prior art elongate battery;

FIG. 2 is a schematic diagram of an array structure of a prior art elongated battery;

FIG. 3 is a perspective view of a prior art tab;

fig. 4 is a top view of a prior art battery pack;

fig. 5 is a top view of a battery pack provided by an embodiment of the present utility model;

FIG. 6 is a cross-sectional view of FIG. 5, with the battery cells removed;

fig. 7 is a perspective view of a battery cell array provided by an embodiment of the present utility model;

FIG. 8 is a perspective view of a tab provided by an embodiment of the utility model;

fig. 9 is a perspective view of a tray provided by an embodiment of the present utility model;

Fig. 10 is a perspective view and a partial enlarged view of a battery cell according to an embodiment of the present utility model;

FIG. 11 is a perspective view and a partial enlarged view of a battery unit according to an embodiment of the present utility model after the battery unit is removed from the top surface;

Fig. 12 is a top view and a partial enlarged view of a cell stack according to an embodiment of the present utility model;

FIG. 13 is a top view and a partial enlarged view thereof of a multi-provided die stack after mounting an output electrode in accordance with an embodiment of the present utility model;

Fig. 14 is a perspective view and a partial enlarged view of a cell stack according to an embodiment of the present utility model;

Fig. 15 is a perspective view and a partial enlarged view of a battery cell according to a second embodiment of the present utility model;

Fig. 16 is a perspective view and a partial enlarged view thereof of a battery unit according to a second embodiment of the present utility model with a side cover removed;

Fig. 17 is a top view and a partial enlarged view of a cell stack according to a second embodiment of the present utility model;

fig. 18 is a perspective view and a partial enlarged view of a cell stack according to a second embodiment of the present utility model;

FIGS. 19-26 are simplified diagrams of cell stacks according to various embodiments of the present utility model;

Reference numerals illustrate: 10. an existing long-strip battery; 11. an existing output electrode; 11a, an existing positive electrode; 11b, an existing negative electrode; 20. an existing bus; 30. a tray; 31. a first side rail; 32. a cross beam; 33. a bottom plate; 34. a second side rail; 40. an electrical device; 50. a battery unit; 501. a cell stack; 5011. a first sub-stack; 5012. a second sub-stack; 502. a cell unit; 503. a cell group; 51. a battery cell; 511. a tab; 52. a housing; 521. an opening; 53. an output electrode; 53a, positive output pole; 53b, a negative output electrode; 54. a busbar support; 60. and a bus bar.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the illustrations, not according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

The battery pack and the battery module are particularly suitable for power batteries, and the power batteries are generally arranged on an electric vehicle chassis, so that the power batteries are required to have a flat outline appearance; the power battery generally comprises a square shell battery, a cylindrical battery, a strip battery and the like, as shown in fig. 1-4, wherein the existing output electrode 11 of the existing strip battery 10 is generally arranged at the end of the battery, specifically, as shown in fig. 1, the existing positive electrode 11a and the existing negative electrode 11b are positioned at the corner between the end face and the top face of the battery, and when the strip battery is combined, the existing output electrodes 11 are positioned at the same side of the combined body, as shown in fig. 2; the assembly is accommodated in a tray 30 of the battery pack, first side beams 31 are respectively arranged at two sides of the tray 30, second side beams are respectively arranged at two ends of the tray 30, an electric device 40 is arranged at one end of the tray 30, and each existing output electrode 11 is connected with the electric device 40 through an existing bus bar 20, as shown in fig. 4; however, since each of the existing output poles 11 is located at one side of the tray 30, the existing bus bar 20 needs to extend a long distance in the width direction of the battery pack to be able to be connected with the electric device 40, which results in an increase in bus bar cost and weight, as shown in fig. 3; in addition, since the existing bus bar 20 is close to the first side beam 31 of the battery pack, when the vehicle collides, the first side beam 31 deforms to press the existing bus bar 20, so that the existing bus bar 20 is damaged, and further, phenomena such as short circuit and arc discharge are caused, and a certain potential safety hazard exists.

According to the utility model, the position of the output electrode of the strip battery is changed, so that the bus bar is far away from the first side beam 31 of the battery pack, the layout length of the bus bar is shortened, meanwhile, the damage of the bus bar caused by the variable extrusion of the first side beam 31 can be avoided, the safety of the power battery is improved, and the technical scheme of the utility model is described in detail with reference to the specific embodiment.

Example 1

Referring to fig. 5-14, a battery pack according to an embodiment of the present utility model includes a tray 30, a bus bar 60, and battery cells 50.

Referring to fig. 5, 6 and 9, the tray 30 includes a bottom plate 33, a first side beam 31 and a second side beam 34, where the two first side beams 31 are respectively disposed at two opposite edges of the bottom plate 33 parallel to a first direction, and the two second side beams 34 are respectively disposed at two opposite edges of the bottom plate 33 parallel to a second direction, where the first direction is a direction parallel to a vehicle length when the battery pack is mounted on a chassis of the vehicle, and the second direction is perpendicular to the first direction or forms an included angle with the first direction.

Referring to fig. 10-14, the battery unit 50 includes one or more battery cells 51 and an output electrode 53 connected to a tab of the battery cell 51, and specifically, the output electrode 53 should include a first output electrode 53a connected to a positive tab of the battery cell 51 and a second output electrode 53b connected to a negative tab of the battery cell 51; the battery cell 50 may be, for example, elongated.

Referring to fig. 5 and 7, a plurality of battery units 50 are arranged on the bottom plate 33 along a first direction, and the length direction of each battery unit 50 is perpendicular to the first direction or forms an included angle, preferably, the length direction of each battery unit 50 is perpendicular to the first direction, so as to fully utilize the space of the accommodating groove and improve the energy density; in other embodiments, the length direction of the battery unit 50 may be disposed at an angle to the first direction according to the actual space layout requirements.

Referring to fig. 5, the output electrodes 53 are disposed on the battery units 50 in a region far from the two first side beams 31, and the output electrodes 53 of the battery units 50 are connected in series or in parallel via a bus bar 60; the position of the bus port of the electrical device 40 may be comprehensively considered when designing the specific position of the output electrode 53, so that the bus 60 may be connected to the bus port of the electrical device 40 in a short path, where the electrical device 40 mainly refers to a power device such as an energy storage converter.

According to the utility model, the output electrode 53 of the battery is arranged at a position far away from the edge of the battery pack, so that on one hand, the distance between the output electrode 53 and a bus port of the electrical equipment 40 can be shortened, the length of the bus 60 is reduced, the weight and cost of the bus 60 are further reduced, on the other hand, the bus 60 can be prevented from being damaged when the edge of the battery pack is deformed, and further, the phenomena of short circuit, arc discharge and the like of the bus 60 are avoided, and the safety of the battery pack is improved.

It should be noted that, the battery unit 50 of the present utility model may be a single battery cell 51, or may be a battery module composed of a plurality of battery cells 51, and when the battery unit 50 is a battery module, the output electrode may be located at a position far from two ends of the battery module by adjusting the stacking manner of the battery cells 51; when the battery unit 50 is a single cell 51, a single cell battery with an output electrode 53 in the middle can be designed; the following examples will illustrate the technical scheme of the present utility model in detail by taking a battery module as an example.

Referring to fig. 5, 7 and 10, in an alternative embodiment of the present utility model, the output electrode 53 is disposed at a middle position of the battery unit 50 in the length direction, and the bus bar 60 connects the output electrodes 53 of the battery units 50 in series in the first direction, in this embodiment, since the output electrode 53 is disposed at the middle of the battery unit 50, the bus bar 60 can be simultaneously far away from the first side beams 31 at two sides of the tray 30, so as to avoid pressing the bus bar 60 when the first side beams 31 deform, in addition, in this embodiment, the bus bar port of the electrical device 40 is closer to the middle of the tray 30, so that the length of the bus bar 60 can be further shortened by disposing the output electrode 53 at the middle of the battery unit 50, and the weight and cost of the bus bar 60 can be reduced. It should be appreciated that in other embodiments, the position of the output electrode 53 may be appropriately adjusted according to the position of the bus port of the electrical device 40, for example, the output electrode 53 may be slightly biased toward one of the side first side beams 31, so long as a sufficient safety distance is ensured between the bus bar 60 and both side first side beams 31.

Referring to fig. 11-14, in the present embodiment, each battery unit 50 includes a plurality of battery cells 502 connected in series, each battery cell 502 is stacked into at least two battery cell stacks 501, each battery cell stack 501 is disposed at intervals along the second direction, and the first output electrode and the second output electrode are disposed between two adjacent battery cell stacks 501; the battery cell 502 includes one or more battery cells 51 connected in parallel with each other. As shown in fig. 12, in a specific embodiment, each of the battery cells 51 is connected in parallel to form a battery cell unit 502, and each of the battery cells 502 is connected in series in sequence, so that each of the battery cells 51 finally forms a total positive output electrode 53a and a total negative output electrode 53b; it should be understood that the number of the series-parallel connection of the battery cells 51 is not particularly limited, and in practical application, a proper number of the battery cells 51 may be connected in parallel or in series to meet the output parameter requirement of the battery module.

It should be understood that, there is a space for accommodating the tab between two adjacent cell stacks 501, and the output electrode 53 is disposed between two adjacent cell stacks 501 in this embodiment, so that this space can be fully utilized, and connection between the output electrode 53 and the tab is facilitated.

As shown in fig. 12, in this embodiment, each of the battery cells 502 are sequentially connected in a string, opposite tabs of each of the battery cells 502 are welded and connected, and then each of the battery cells 51 is sequentially folded back and forth with a portion of the tabs as inflection points, so that at least two battery cells 502 are ensured in each layer during folding, and two tabs 511 at two ends of the folded battery cell string are respectively located between two adjacent battery cells 51 at the outermost layer.

In a specific embodiment, as shown in fig. 12 and 19-21, the battery unit 50 includes at least a first sub-stack 5011 and a second sub-stack 5012 that are adjacently disposed, and the first sub-stack 5011 and the second sub-stack 5012 include m cell groups 503 stacked in sequence along a predetermined direction, respectively; the nth cell group 503 of the first sub-stack 5011 in the preset direction is electrically connected with the adjacent end of the (n+1) th cell group 503 of the second sub-stack 5012 in the preset direction, wherein n is less than m; an m-th cell group 503 of the first sub-stack 5011 in a preset direction is electrically connected to the first output electrode adjacent to one end of the second sub-stack 5012, and an 1-th cell group 503 of the second sub-stack 5012 in the preset direction is electrically connected to the second output electrode adjacent to one end of the first sub-stack 5011; the i-th and i-1-th cell groups 503 of the first sub-stack 5011 in the preset direction are electrically connected to one end of the second sub-stack 5012; the i-th and i-1-th cell groups 503 of the second sub-stack 5012 in the predetermined direction are electrically connected to one end of the first sub-stack 5011, where i is equal to or less than m, and i is an even number.

In a further embodiment, the battery cell group 503 may include, for example, one battery cell 502, as shown in fig. 19; multiple cells 502 connected in series with each other may also be included, as shown in fig. 20; each cell unit 502 may include one cell, as shown in fig. 19; it is also possible to include a plurality of cells 51 connected in parallel with each other as shown in fig. 21.

The folding manner can reduce the length of the electrode lugs among the battery cells 51 to the maximum extent; it should be noted that the folding manner of the cell string is not only required, as long as it can be ensured that after the cell string 51 is folded and formed, the tabs 511 at two ends of the cell string 51 can be located between two adjacent cell stacks 501, for example, the folding manner shown in fig. 22-26 may also be adopted.

Referring to fig. 5 and 11, in a specific embodiment, the battery cells 51 may be, for example, soft package battery cells, and each battery cell 51 is stacked along a first direction, that is, a large-area direction of each battery cell 51 is perpendicular to the first direction; further, each cell 51 in the same battery unit 50 is encapsulated in one housing 52; the top surface of the housing 52 is provided with an opening 521, and the opening 521 is disposed between two adjacent cell stacks 501, so that the output electrode 53 is exposed. In a specific embodiment, the housing 52 may include a preformed housing and a cover plate, where the battery cells 51 are stacked and then accommodated in the housing, then the cover plate is covered at the notch of the housing, and the cover plate and the housing are fixed by welding, riveting or bonding, so that, for the purpose of facilitating the filling of the battery cells 51, the plate surface of the cover plate should be perpendicular to the large surface of the battery cells 51, and therefore, in this embodiment, the cover plate is located at the top of the housing 52. In a further embodiment, for example, a bus bar bracket 54 may be disposed in the housing 52, where the bus bar bracket 54 is made of an insulating material, and the bus bar bracket 54 is capable of effectively supporting the output electrode 53 and the bus bar 60.

Referring to fig. 7 and 10, in a further embodiment, the opening 521 extends to a side wall of the housing 52 to form a channel for receiving the bus bar 60. In this embodiment, the bus bar 60 is accommodated in the channel, so as to avoid the bus bar 60 protruding from the upper surface of the battery pack, thereby improving the space utilization rate, reducing the overall thickness of the battery pack, and effectively protecting the bus bar 60.

Referring to fig. 9, in an embodiment, in order to improve the overall structural strength of the tray 30, a beam 32 is disposed on the bottom plate, the beam 32 is fixedly connected to the bottom plate 33, and the length direction of the beam 32 is perpendicular to or forms an included angle with the first direction, and specifically, the beam 32 may be parallel to the length direction of the battery unit 50, for example.

Example two

Referring to fig. 15 to 18, the difference between the second embodiment and the first embodiment of the present utility model is that the stacking directions of the battery cells 51 are different, specifically, in this embodiment, each battery cell 51 is stacked along the normal direction of the bottom plate 33, compared with the first embodiment, the extending direction of the tab of the battery cell 51 is changed, and the tab is horizontally disposed in this embodiment, so that the specific shape of the output electrode 53 needs to be adaptively adjusted, specifically, in this embodiment, one of the output electrodes 53 is directly connected to the uppermost tab 511, and the other output electrode 53 is connected to the lowermost tab 511 and is bent upward to the top of the housing 52, as shown in fig. 18, correspondingly, the shape of the bus bar bracket 54 needs to be adaptively adjusted to avoid the output electrode 53.

In summary, the output electrode 53 of the battery is arranged at a position far away from the edge of the battery pack, so that the distance between the output electrode 53 and a bus port of the electrical equipment 40 can be shortened, the length of the bus 60 can be reduced, the weight and cost of the bus 60 can be further reduced, the bus 60 can be prevented from being damaged when the edge of the battery pack is deformed, the phenomena of short circuit, arc discharge and the like of the bus 60 can be further avoided, and the safety of the battery pack is improved; according to the utility model, the bus bar 60 is accommodated in the channel, so that the bus bar 60 is prevented from protruding out of the upper surface of the battery pack, the space utilization rate is improved, the overall thickness of the battery pack is reduced, and meanwhile, the bus bar 60 can be effectively protected.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (11)

1. A battery pack, comprising:

The tray comprises a bottom plate, wherein first side beams are arranged at two opposite edges of the bottom plate along a first direction; the two opposite edges of the bottom plate along the second direction are provided with second side beams, wherein the first direction and the second direction are mutually perpendicular or are arranged at an included angle;

A busbar; and

The battery units are arranged on the bottom plate along the first direction; the first output electrode and the second output electrode of each battery unit are arranged in the areas far away from the two first side beams, and the first output electrode and the second output electrode of each battery unit are connected in series or in parallel through the bus bars respectively.

2. The battery pack according to claim 1, wherein the output electrode is provided at a central position in a longitudinal direction of the battery cell.

3. The battery pack of claim 1, wherein each of the battery cells comprises a plurality of battery cells connected in series with each other, each of the battery cells being stacked into at least two battery cell stacks, each of the battery cell stacks being disposed at intervals along the second direction, the first and second output poles being disposed between two adjacent battery cell stacks; the battery cell unit comprises one or a plurality of battery cells which are mutually connected in parallel.

4. The battery pack according to claim 1, wherein the battery cells include at least a first sub-stack and a second sub-stack disposed adjacently, the first sub-stack and the second sub-stack each including m cell groups stacked in sequence along a preset direction;

An nth cell group of the first sub-stack body in the preset direction is electrically connected with the adjacent end of an (n+1) th cell group of the second sub-stack body in the preset direction, wherein n is less than m;

An m-th cell group of the first sub-stack body in the preset direction is adjacent to one end of the second sub-stack body and is electrically connected with the first output electrode, and a 1-th cell group of the second sub-stack body in the preset direction is adjacent to one end of the first sub-stack body and is electrically connected with the second output electrode;

The ith and the (i-1) th battery cell groups of the first sub-stack body in the preset direction are electrically connected with one end of the second sub-stack body far away from the second sub-stack body; and the ith and the (i-1) th battery cell groups of the second sub-stack body in the preset direction are electrically connected with one end of the battery cell group far away from the first sub-stack body, wherein i is less than or equal to m, and i is an even number.

5. The battery pack of claim 4, wherein the cell stack comprises one or more cells connected in series along the second direction, the cell comprising one or more cells connected in parallel with each other.

6. The battery pack of claim 4, wherein the predetermined direction is coincident with the first direction.

7. The battery pack of claim 4, wherein the predetermined direction coincides with a normal direction of the bottom plate.

8. The battery pack of claim 3 or 4, wherein each of the cells within the same cell is enclosed within a housing.

9. The battery pack of claim 8, wherein the top surface of the housing is provided with an opening disposed between two adjacent cell stacks such that the first and second output poles are exposed.

10. The battery pack of claim 9, wherein the opening extends to a side wall of the housing to form a channel for receiving the buss bar.

11. The battery pack according to claim 1, wherein a cross beam is provided on the bottom plate, the cross beam is fixedly connected with the bottom plate, and a length direction of the cross beam is consistent with the second direction.