CN220652110U

CN220652110U - Battery pack

Info

Publication number: CN220652110U
Application number: CN202321870640.9U
Authority: CN
Inventors: 李冉; 王帅锋; 尚雪莉; 刘国峰; 蒋豪; 曾佳静
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-07-14
Filing date: 2023-07-14
Publication date: 2024-03-22
Anticipated expiration: 2033-07-14

Abstract

The application provides a battery package, battery package includes: a case, comprising: the bottom shell and the heat exchange plate are covered on the bottom shell, and the heat exchange plate is provided with a plurality of spray holes; wherein, the bottom shell and the heat exchange plate are matched to form a mounting cavity, and a battery bin is arranged in the mounting cavity; the separation plate is arranged in the battery compartment; the separation plate is provided with a plurality of through holes, and two ends of the separation plate body are respectively connected to the inner wall of the battery compartment so as to reinforce the battery compartment and separate a plurality of sub battery compartments; the cooling liquid is filled in the plurality of sub-battery bins and used for cooling the battery packs in the corresponding sub-battery bins; the ratio of the total area of the spray holes to the total area of the through holes is in the range of 1:5-10:1. The replacement hot plate is arranged at the top of the box body to spray and cool the battery modules in the battery pack, so that the temperature regulation control of the battery modules in the battery pack is realized; and based on setting up the division board in the box, can also carry out comprehensive enhancement to the box structure when simplifying box inner structure.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

With the development of power batteries, the quality requirements on the batteries are also higher and higher. In the related art, the lower shell is used as an important bearing part of the battery pack box body, and the structure such as a high-voltage interface, a low-voltage interface, an equipotential connecting sheet and the like is required to be arranged on the lower shell, so that the strength of the box body can be greatly reduced.

In addition, to provide a suitable working environment for the battery, a corresponding temperature control system is usually provided in the battery pack, for example: the liquid cooling plates with corresponding flow channels are arranged between batteries in the battery pack to regulate the temperature of the battery unit, and the liquid cooling plates possibly have a certain reinforcing effect on the box body when being matched with the box body, but the structure is complex, the strength of the box body is limited, and the heat exchange benefit is not ideal; or, set up the spray plate in the box and form and spray heat transfer to the battery, but this mode can lead to the box intensity to further reduce again to because the battery often is settled in a plurality of battery bins, when the coolant liquid that sprays out on the spray plate can't free flow in different battery bins, also can influence the cooling effect.

Disclosure of Invention

Accordingly, an object of the present application is to provide a battery pack for solving the technical problems of poor strength and unsatisfactory heat exchange effect of the battery pack in the prior art.

In order to achieve the above purpose, the present application provides the following technical solutions:

the application provides a battery package, the battery package includes:

a case, comprising: the bottom shell and the heat exchange plate are covered on the bottom shell; the bottom shell and the heat exchange plate are matched to form an installation cavity, a battery bin is arranged in the installation cavity, and a plurality of spray holes are formed in the heat exchange plate;

the separation plate is arranged in the battery compartment; the separation plate is provided with a plurality of through holes, and two ends of the separation plate body are respectively connected to the inner wall of the battery compartment so as to reinforce the battery compartment and separate a plurality of sub battery compartments;

the cooling liquid is filled in the plurality of sub-battery bins and used for cooling the battery packs in the corresponding sub-battery bins;

wherein the ratio of the total area of the spray holes to the total area of the through holes is in the range of 1:5-10:1.

In the technical scheme, the battery pack is provided, the replacement hot plate is arranged at the top of the box body of the battery pack to spray and cool the battery modules in the battery pack, the corresponding relation between the size of the spraying holes and the size of the through holes on the partition plate is optimized, and the cooling effect on the battery modules in the battery pack is improved; and based on the division plate with the through holes arranged in the box body, the box body structure can be comprehensively reinforced while the box body internal structure is simplified.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view showing a case structure of a battery pack according to an exemplary embodiment;

fig. 2 is a schematic view showing an internal structure of a battery pack according to an exemplary embodiment;

FIG. 3 is a schematic diagram illustrating an assembled state of an end plate and a partition plate according to an exemplary embodiment;

fig. 4 is a cross-sectional view of a heat exchanger plate according to an exemplary embodiment.

In the figure: 10. a case; 101. a heat exchange plate; 1011. a cover plate; 1012. a flow channel plate; 101A, a heat exchange flow channel; 102. a bottom case; 10A, a liquid collecting bin; 10B, a battery compartment; 10C, an electrical bin; 301. an end plate; 401. a battery cell; 501. a partition plate; 5011. and a connecting piece.

Detailed Description

The present application is further described in detail below by way of the accompanying drawings and examples. The features and advantages of the present application will become more apparent from the description.

The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.

In the related art, with the development of power batteries, the quality requirements on the batteries are also higher and higher. Wherein lower casing is as an important bearing part of battery package, needs to set up high voltage interface, low voltage interface, equipotential connection piece isotructure on it, if: the front side wall of the lower shell in the box body is designed into a whole structure, and the structures such as a high-voltage interface, a low-voltage interface, an equipotential connecting sheet and the like are all arranged on the front side wall. However, the integral structural design makes the front side wall heavy, costly and difficult to meet in strength.

In addition, to provide a suitable working environment for the battery, a corresponding temperature control system is usually disposed in the battery pack, for example: the liquid cooling plates with corresponding flow channels are arranged between the batteries in the battery pack to regulate the temperature of the battery units, and the liquid cooling plates designed in the battery pack are matched with the box body to possibly have a certain strength effect on the box body, but the structure is complex, the strength of the box body is limited, and the heat exchange benefit is not ideal; or, set up the spray plate in the box and form and spray heat transfer to the battery, but this mode can lead to the box intensity to further reduce again to because the battery often is settled in a plurality of battery bins, when the coolant liquid that sprays out on the spray plate can't free flow in different battery bins, also can influence the cooling effect.

Based on the above, the application provides a battery pack, by optimizing a box body structure, wherein a replacement hot plate is arranged at the top of the box body to spray and cool battery modules in the battery pack, and the corresponding relation between the sizes of the spraying holes and through holes on the partition plate is optimized, so that the cooling effect can be ensured when the temperature adjustment control is performed on the battery modules in the battery pack, and the internal structure of the box body is simplified; and based on the inside division board that sets up at the box, because the structure of division board is simpler than the liquid cooling board, and better to box reinforcement effect to can strengthen the box structure comprehensively.

The technical solution of the present embodiment is described in detail below with reference to the accompanying drawings, and the following embodiments and implementations may be combined with each other without conflict.

In an exemplary embodiment of the present utility model, a battery pack is provided, as shown in fig. 1 to 2, fig. 1 is a schematic view of a case structure of the battery pack according to an exemplary embodiment; fig. 2 is a schematic view illustrating an internal structure of a battery pack according to an exemplary embodiment. The battery pack includes:

a case 10, comprising: a bottom case 102 and a heat exchange plate 101 provided on the bottom case 102; wherein, the bottom shell 102 and the heat exchange plate 101 are matched to form a mounting cavity, a battery compartment 10B is arranged in the mounting cavity, and a plurality of spray holes are formed on the heat exchange plate 101;

a partition plate 501 provided in the battery compartment 10B; wherein the partition plate 501 is provided with a plurality of through holes, and two ends of the plate body of the partition plate 501 are respectively connected to the inner wall of the battery compartment 10B to reinforce the battery compartment 10B and separate a plurality of sub-battery compartments;

In the present exemplary embodiment, the replacement hot plate 101 is arranged at the top of the box 10 to spray and cool the battery modules in the battery pack, so that the corresponding relationship between the size of the spraying holes and the size of the through holes on the partition plate is optimized, the cooling effect on the battery modules in the battery pack is improved, and the internal structure of the box 10 is simplified; and based on the partition plate 501 with the through holes provided inside the case 10, the case structure can be fully reinforced while simplifying the case internal structure.

The total area of the spray holes is the sum of the hole areas of the spray holes (corresponding to the area dug when the spray holes are formed in the heat exchange plate); the total area of the similar through holes means the sum of the hole areas of the respective through holes (corresponding to the area dug when the respective through holes are formed in the corresponding one of the partition plates).

In some exemplary embodiments, as shown in fig. 2, fig. 2 is a schematic view of the internal structure of a battery pack according to an exemplary embodiment. In the present exemplary embodiment, the battery pack further includes: a battery module disposed within the battery compartment 10B. The battery module includes: a plurality of rows of battery packs; wherein, the multi-row battery packs are arranged at both sides of the partition plate 501 along the extending direction of the plate body of the partition plate 501 so as to partition and limit the battery modules through the partition plate 501.

In consideration of the plurality of battery cells 401 provided inside the battery module, the partition plate 501 may be used to assist in fixing the multi-row battery pack. Specifically, a plurality of sub-battery compartments are partitioned in the battery compartment 10B by the partition plate 501, and the plurality of rows of battery packs are arranged in a partitioned manner. Since the battery pack is arranged between the partition plate 501 and the partition plate 501, and between the partition plate 501 and the inner wall of the battery compartment 10B, the limit of the battery pack can be formed at this time. On the one hand, the case 10 can be reinforced by providing the partition plate 501 in the battery compartment 10B of the case 10; on the other hand, the battery module can also restrict the battery packs in each row, so that the whole stability of the battery module is maintained.

In some exemplary embodiments, as shown in fig. 2, fig. 2 is a schematic view of the internal structure of a battery pack according to an exemplary embodiment. In the present exemplary embodiment, the battery cell 401 is considered to be variously structured, such as columnar, plate-like, and the like; wherein, for the plate-shaped structure of the battery cells 401, the space occupied before and after arranging the battery cells to form a battery module is not greatly changed; and, for the battery cells 401 of the column structure, there may be a large difference in the front and rear of the arrangement thereof into a battery module. In order to reduce the space occupied by the battery module of the battery cell 401 adopting the columnar structure, the battery module needs to be arranged in a staggered manner to reduce the space occupied by the battery module. In order to adapt to the battery cells 401 adopting the staggered columnar structure, the partition plate 501 adopts a curved plate, and the plate body of the curved plate has curved surface radian matched with two adjacent rows of battery packs. Based on this, the corresponding battery cells 401 can be arranged in rows on two sides of the plate body, so that the curved surfaces of the shells of the battery cells 401 in the corresponding battery packs are attached to the plate body as much as possible, and the space occupied by the whole battery module in the box body 10 is reduced.

To achieve the internal temperature equalization of the respective battery modules, the separator plate 501 employs a heat conductive plate. Based on the partition plate 501, heat generated by the battery cell 401 with higher temperature is conducted to the other side from one time of the heat conducting plate, and both sides of the partition plate 501 are contacted with cooling liquid, so that the battery cell 401 with higher temperature can be rapidly cooled.

In some exemplary embodiments, as shown in fig. 2, fig. 2 is a schematic view of the internal structure of a battery pack according to an exemplary embodiment. In the present exemplary embodiment, the battery pack further includes: and a cooling device. The cooling device circulates a cooling fluid to cool the battery module. Based on the cooling device, the cooling liquid is controlled to circularly flow in the battery pack, so that the cooling liquid in the circulated return electricity Chi Cang is pumped at a preset pumping position through the cooling device after being sufficiently subjected to heat exchange with the battery module, so that a liquid level difference is formed in the battery compartment, and flow is generated, so that the battery module is cooled more sufficiently and efficiently. In addition, as the through holes are formed in the partition plates, the cooling liquid can flow between the adjacent sub-battery bins, and the heat exchange cooling effect is further improved.

In order to ensure that the cooling liquid has a better cooling effect on the battery module. Illustratively, the height of the separator plate 501 < the level of the coolant < the height of the battery post of any of the battery cells 401 in the multi-row battery pack. Wherein, the liquid level of coolant liquid is highly to indicate: when the case 10 is in a horizontally placed state and the cooling device sucks the cooling liquid and supplies the liquid to the heat exchange plate 101 for spraying, the cooling liquid reaches a dynamic height (the average value of the data measured at least two measuring points is taken when the dynamic height is obtained) in the battery compartment 10B.

Since the battery compartment 10B is filled with the cooling liquid having a certain liquid level, the lower part of the battery module (the battery case of the battery cell 401) can be soaked, and the heat of the battery module is carried away by the circulating flow of the cooling liquid. In this embodiment, based on the fact that a certain amount of cooling liquid is poured into the battery compartment 10B to be matched with the design mode of the heat exchange plate 101, the battery module is cooled integrally from top to bottom. For example, the cooling liquid may use a liquid having insulation properties such as cooling oil to exchange heat and cool the battery module.

In some exemplary embodiments, as shown in fig. 2, fig. 2 is a schematic view of the internal structure of a battery pack according to an exemplary embodiment. In the present exemplary embodiment, the case 10 further includes: a pair of end plates 301 disposed opposite to each other in the mounting chamber are used to divide the electric compartment 10C, the battery compartment 10B, and the liquid collecting compartment 10A in order in the bottom case 102. Wherein, the electrical bin 10C is used for installing an electrical box; the liquid collection bin 10A is communicated with the battery bin 10B and is used for collecting the cooling liquid discharged from the battery bin 10B for supplying to the heat exchange plate 101. By providing the pair of end plates 301, the box body 10 of the battery pack is constructed into three bins, namely an electric bin 10C, a battery bin 10B and a liquid collecting bin 10A in sequence, the liquid collecting bin 10A is used as a transfer bin of cooling liquid, a corresponding pump is arranged in a cooling device for pumping, and the cooling liquid is pumped into the heat exchange plate 101 after being cooled to spray and cool the battery module.

As shown in fig. 2, fig. 2 is a schematic view illustrating an internal structure of a battery pack according to an exemplary embodiment. To divide the mounting cavity formed in the case 10 into different functional areas for assembling corresponding structural members, the inside of the case 10 is partitioned based on the end plates 301 in this embodiment. At this time, when the case 10 is reinforced by the partition plate 501, the partition plate 501 may be connected to the end plate 301. Illustratively, as shown in fig. 3, fig. 3 is a schematic diagram illustrating an assembled state of an end plate and a partition plate according to an exemplary embodiment. The pair of end plates 301 includes a first end plate 301 and a second end plate 301; the first end of the partition plate 501 is connected to a plate surface of the first end plate 301 through a connecting member 5011, and the second end of the partition plate 501 is connected to a plate surface of the second end plate 301 through a connecting member 5011.

The number of the end plates 301 and the number of the bins partitioned in the case 10 may be adjusted according to actual needs. The positions of the bins can be optimized and adjusted according to actual needs, and it is ensured that the liquid collecting bin 10A needs to be communicated with the battery bin 10B. Illustratively, three end plates 301 may be provided to construct the case 10 of the battery pack into four bins, or four end plates 301 may be provided to construct the case 10 of the battery pack into five bins, etc.

In consideration of the imbalance in temperature in the battery module in the battery compartment 10B, the coolant poured into the battery compartment 10B may be used to circulate the coolant sufficiently to avoid the local excessive temperature. The coolant flows between the respective sub-battery compartments, and a first predetermined gap (not shown) is maintained between the first end of the partition plate 501 and the first end plate 301; and/or a second predetermined gap (not shown) is maintained between the second end of the partition plate 501 and the second end plate 301; and/or, a plate edge of the partition plate 501 on a side near the bottom case 102 maintains a third preset gap (not shown) with an inner bottom of the bottom case 102.

In another alternative, in order to enable the coolant to flow between the sub-battery compartments, the partition plate 501 is provided with through holes, and at the same time, clearance through holes and clearances are reserved between the partition plate 501 and the bottom case 102 and/or the corresponding end plate 301, and are used for communicating the sub-battery compartments on both sides of the partition plate 501 to balance the coolant temperature.

In some exemplary embodiments, as shown in fig. 4, fig. 4 is a cross-sectional view of a heat exchange plate 101 shown according to an exemplary embodiment. The heat exchange plate 101 is formed by matching a cover plate 1011 and a flow channel plate 1012, wherein grooves are formed on the flow channel plate 1012, and when the cover plate 1011 is arranged on the flow channel plate 1012, a plurality of heat exchange flow channels 101A are formed between the two plates. In order to facilitate the spraying of the battery pack, the extending direction of the heat exchange flow channel 101A corresponds to the arrangement direction of the battery pack. Illustratively, a plurality of heat exchange flow passages 101A corresponding to the arrangement direction of the battery pack are formed in the heat exchange plate 101. Wherein, the surface of the heat exchange plate 101 facing the battery module is provided with spray holes communicated with the heat exchange flow channel 101A. Optionally, the ratio of the total area of the spray holes to the total area of the through holes is in the range of 1:1 to 3:1.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc. are based on the directions or positional relationships in the working state of the present application, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, unless explicitly specified and limited otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The present application has been described in connection with the preferred embodiments, but these embodiments are merely exemplary and serve only as illustrations. On the basis of this, many alternatives and improvements can be made to the present application, which fall within the scope of protection of the present application.

Claims

1. A battery pack, the battery pack comprising:

2. The battery pack of claim 1, wherein the battery pack further comprises: a battery module arranged in the battery compartment,

the battery module includes: a plurality of rows of battery packs; the multi-row battery packs are arranged on two sides of the partition plate along the extending direction of the partition plate body, so that the partition plate is used for partition limiting of the battery modules.

3. The battery pack of claim 2, wherein the separator plate is a curved plate having a curved curvature of the plate body adapted to the adjacent two rows of the battery packs.

4. The battery pack of claim 1, wherein the separator is a heat conductive plate.

5. The battery pack of claim 2, wherein the battery pack further comprises: the cooling device comprises a cooling device, a cooling device and a cooling device,

the cooling device circularly pumps the cooling liquid to cool the battery module.

6. The battery pack of claim 5, wherein the height of the separator plate < the level of the coolant < the height of the battery post of any one of the battery cells in the multi-row battery pack.

7. The battery pack of claim 5, wherein the case further comprises: a pair of end plates oppositely arranged in the mounting cavity and used for dividing an electric bin, the battery bin and a liquid collecting bin in the bottom shell in sequence;

wherein the electrical bin is used for installing an electrical box; the liquid collecting bin is communicated with the battery bin and used for collecting cooling liquid discharged from the battery bin to be supplied to the heat exchange plate.

8. The battery pack of claim 7, wherein the battery pack comprises a plurality of battery cells,

the pair of end plates includes a first end plate and a second end plate;

the first end of the partition plate is connected to a plate surface of the first end plate through a connecting piece, and the second end of the partition plate is connected to a plate surface of the second end plate through a connecting piece;

wherein a first predetermined gap is maintained between the first end of the divider plate and the first end plate; and/or maintaining a second predetermined gap between the second end of the divider plate and the second end plate; and/or, a third preset gap is kept between the plate edge of the partition plate, which is close to one side of the bottom shell, and the inner bottom of the bottom shell.

9. The battery pack according to claim 5, wherein a plurality of heat exchange flow passages corresponding to the arrangement direction of the battery pack are formed in the heat exchange plate,

wherein, the surface of the heat exchange plate facing the battery module is provided with the spray holes, and the spray holes are communicated with the heat exchange flow channel; the total area of the spraying holes is in a range of 1:1-3:1 with the total area of the through holes.