CN219811572U - Battery pack - Google Patents

Abstract

The utility model discloses a battery pack, and belongs to the technical field of battery structures. The battery pack comprises a battery cell group, liquid cooling plates and a lower shell, wherein a plurality of battery cells are arranged to form the battery cell group, a row of battery cells are clamped between two adjacent liquid cooling plates, the lower shell is used for supporting the battery cell group, a runner is arranged in the lower shell, the runner is communicated with the liquid cooling plates, and a refrigerant flows between the lower shell and the liquid cooling plates. Through set up the runner in lower casing to be linked together with the liquid cooling board in the electric core group, from the bottom surface and the side conduction heat of electric core simultaneously, compare in the bottom surface and the side at electric core all set up the liquid cooling board, on the basis that also increases heat transfer efficiency, can also simplify battery package structure, reduce battery package weight, promoted the energy density of battery package greatly.

Description

Battery pack

Technical Field

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

Background

The existing battery pack mainly comprises a box body of the battery pack and a plurality of battery modules arranged in the box body. The battery module is internally provided with components such as a battery core and the like, and is an important component part of electric equipment such as an electric automobile and the like.

The existing battery pack mostly adopts a liquid cooling plate to dissipate heat. The liquid cooling plate is arranged in the battery pack shell, is positioned between the battery pack shell and the battery module, absorbs heat generated by the operation of the battery module, and disperses the heat outside the battery pack through flowing refrigerants, so that the temperature of the battery module is controlled. But there are also the following problems in this battery pack:

1. the heat transfer efficiency is lower, and the heat dissipation requirement of the internal battery core of the battery module cannot be met when the battery module works for a long time with high power.

2. The overall weight of the battery pack is large, reducing its energy density.

Based on the foregoing, there is a need for a battery pack that solves the above-mentioned problems.

Disclosure of Invention

The utility model aims to provide a battery pack which has higher heat transfer efficiency, meets the heat dissipation requirement of an internal battery cell and has lighter weight.

To achieve the purpose, the utility model adopts the following technical scheme:

a battery pack, comprising:

the battery cell group is formed by arranging a plurality of battery cells;

a row of the electric cores are clamped between two adjacent liquid cooling plates;

the lower shell is used for supporting the battery cell group, a flow channel is arranged in the lower shell and communicated with the liquid cooling plate, and a refrigerant flows between the lower shell and the liquid cooling plate.

Optionally, the battery cell group is of a single-layer structure, a plurality of battery cells are longitudinally arranged to form a row of the battery cells, and a plurality of rows of the battery cells are transversely arranged to form the battery cell group.

Optionally, a structural adhesive is disposed between the cells in the same row.

Optionally, a heat-conducting structural adhesive is arranged between the battery core and the lower shell,

or a heat conduction structural adhesive is arranged between the battery core and the liquid cooling plate.

Optionally, the lower housing includes a first plate and a second plate, the length direction of the first plate is perpendicular to the length direction of the second plate, the plurality of first plates are arranged along the width direction of the first plate, and two ends of the length direction of the plurality of first plates are fixedly connected with the second plate.

Optionally, the first plate and the second plate are both provided with the flow channel, the first plate has a first interface communicated with the flow channel, the second plate has a second interface communicated with the flow channel and a plurality of split-flow ports, the first interface is correspondingly communicated with the split-flow ports, and the second interface is communicated with the liquid cooling plate.

Optionally, the plurality of the split ports at least include a first split port and a second split port, the first split port is closer to the second port than the second split port, and the flow area of the first split port is smaller than that of the second split port, so that the refrigerant flow passing through the first split port and the second split port is the same.

Optionally, the second plate is further provided with a fastening point, and the battery pack is fixedly arranged in the vehicle through the fastening point.

Optionally, the first plate and the second plate are extruded hollow plates.

Optionally, the hollow plate has a plurality of layers of cavities sequentially arranged in a thickness direction, wherein one layer of the cavities is a runner cavity with the runner, the other layer of the cavities is a protection cavity, and the runner cavity is located between the protection cavity and the battery cell.

The battery pack provided by the utility model has the beneficial effects that: through set up the runner in lower casing to be linked together with the liquid cooling board in the electric core group, from the bottom surface and the side conduction heat of electric core simultaneously, compare in the bottom surface and the side at electric core all set up the liquid cooling board, on the basis that also increases heat transfer efficiency, can also simplify battery package structure, reduce battery package weight, promoted the energy density of battery package greatly.

Drawings

Fig. 1 is a first exploded view of a battery pack according to the present utility model;

fig. 2 is a second exploded view of the battery pack according to the present utility model;

fig. 3 is a perspective view of the lower case in the present embodiment;

fig. 4 is an exploded view of the first plate member in the present embodiment;

FIG. 5 is a cross-sectional view at A in FIG. 4;

FIG. 6 is a schematic view of the flow of refrigerant in the first plate;

fig. 7 is an exploded view of the second plate member in the present embodiment;

FIG. 8 is a cross-sectional view at B in FIG. 7;

fig. 9 is a schematic view of the flow of the refrigerant in the lower case.

In the figure:

1. an upper housing;

2. a lower housing; 200. a flow channel cavity; 201. a protection cavity; 202. a blocking member; 21. a first plate member; 211. a first interface; 22. a second plate member; 221. a second interface; 222. a shunt port; 2221. a first shunt port; 2222. a second shunt; 223. junction points; 224. a quick connector;

3. an electrical interactive element;

41. a liquid cooling pipeline; 411. a water inlet; 412. a water outlet; 413. a quick plug interface; 42. a liquid cooling plate; 43. a cell expansion restraint;

5. a cell group; 51. and a battery cell.

Detailed Description

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements 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 utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The battery pack provided by the present utility model is described below with reference to fig. 1 to 9.

As shown in fig. 1 and 2, the battery pack mainly includes a battery pack case, and a battery cell group 5, an electric interaction member 3, a liquid cooling pipe 41, a liquid cooling plate 42, and the like, which are provided in the battery pack case. The battery pack shell comprises an upper shell 1 and a lower shell 2, and the upper shell 1 and the lower shell 2 can form a sealed battery pack shell, so that a stable working environment is provided for parts such as an internal battery cell group 5. The electric interactive element 3 and the liquid cooling pipeline 41 are arranged through the upper shell 1, so that a circuit and a liquid path in the battery pack are communicated with the outside of the battery pack. The battery cell group 5 and the liquid cooling plate 42 are fixedly arranged on the lower shell 2 and supported by the lower shell 2.

The battery shell is internally provided with a plurality of electric cores 51 and a plurality of liquid cooling plates 42, wherein the electric cores 51 are directly arranged to form an electric core group 5, and a row of electric cores 51 are clamped between two adjacent liquid cooling plates 42, so that two side surfaces of each row of electric cores 51 are contacted with the liquid cooling plates 42, and heat generated by the electric cores 51 is absorbed more efficiently. Optionally, the two liquid cooling plates 42 located at the outermost sides of the battery cell group 5 form the battery cell expansion constraint member 43 by means of setting reinforcing ribs, increasing thickness and the like, the battery cell expansion constraint member 43 has better deformation resistance, can resist the expansion force of the battery cell 51, and compared with the technical scheme that the liquid cooling plates 42 located in the battery cell group 5 are also provided with the reinforcing ribs, increasing thickness and the like, the battery cell expansion constraint member has optimized structural strength, can simplify the structure while meeting the expansion of the battery cell 51, and optimize the weight of the whole battery pack.

With continued reference to fig. 3 and 9, a flow passage is further provided in the lower case 2, the flow passage is in fluid communication with the liquid cooling plate 42 through the liquid cooling pipe 41, and heat generated by the battery cell 51 is transferred to the flow passage of the lower case 2 through the bottom surface of the battery cell 51. After the refrigerant enters the inner side of the battery pack case through the liquid cooling pipeline 41, the refrigerant flows between the liquid cooling plate 42 and the flow channel in the lower case 2 and absorbs heat generated by the battery core 51, and then the heat is transferred out of the battery pack through the liquid cooling pipeline 41. It should be noted that, according to the actual use situation (for example, summer and winter), the temperature of the refrigerant is adjusted, so that the refrigerant can absorb the heat of the electric core 51, and also can release the heat to the electric core 51, so as to increase the temperature of the electric core 51, which is not particularly limited in the present utility model.

Through set up the runner in lower casing 2 to be linked together with liquid cooling board 42 in the electric core group 5, heat conduction is in the bottom surface and the side of electric core 51 simultaneously, compares in all setting up liquid cooling board 42 in the bottom surface and the side of electric core 51, on the basis of also increasing heat transfer efficiency, can also simplify battery package structure, reduce battery package weight, promoted the energy density of battery package greatly.

Optionally, in this embodiment, the battery cell group 5 is a single-layer structure, the plurality of battery cells 51 are longitudinally arranged into a row of battery cells 51, the battery cells 51 and the liquid cooling plate 42 (corresponding flow channels can be set in the liquid cooling plate 42 according to the actual sizes of the battery cells 51) are alternately arranged, and the plurality of battery cells 51 are transversely arranged to form the battery cell group 5. The single-layer battery cell group 5 can flatten the battery pack, so that the internal structure of the battery pack is simplified, the number of parts is reduced, and the cost is reduced. The single-layer battery cell group 5 can ensure that each battery cell 51 is in heat conduction connection with the lower shell 2, so that the phenomenon that the heat transfer of the battery cells 51 positioned on the upper layer in the multi-layer battery cell group 5 is not timely is avoided. The liquid cooling plates 42 are alternately interposed in the cell groups 5, and can also absorb the expansion force of the cells 51, thereby ensuring the structural stability of the entire battery pack, particularly, the cell groups 5 therein.

Specifically, in this embodiment, a structural adhesive is disposed between the cells 51 in the same row. The structural adhesive can improve the shearing resistance between the battery cells 51, prevent relative dislocation and looseness between the battery cells 51 in the same row in the use process of the battery pack, and enable part of the battery cells 51 to be separated from the liquid cooling plate 42, so that overheat phenomenon occurs.

Preferably, a heat-conducting structural adhesive is arranged between the battery cell 51 and the lower shell 2, which can not only promote the connection stability between the battery cell 51 and the lower shell 2, but also improve the heat conduction efficiency between the battery cell 51 and the lower shell 2, and prevent the heat from being quickly transferred among the battery cell 51, the liquid cooling plate 42 and the lower shell 2 to cause too large temperature difference. Optionally, a heat-conducting structural adhesive is also disposed between the electric core 51 and the liquid cooling plate 42, so that the connection stability and heat transfer efficiency between the electric core 51 and the liquid cooling plate 42 can be improved.

As shown in fig. 3, in the present embodiment, the lower case 2 includes a first plate 21 and a second plate 22, and the first plate 21 and the second plate 22 are respectively disposed longitudinally (i.e., the arrangement direction of the above-described battery cells 51 forming a row) and transversely, and are assembled to form the lower case 2. Specifically, the first plate member 21 is disposed longitudinally, and its longitudinal direction is perpendicular to the longitudinal direction of the second plate member 22, i.e., the second plate member 22 is disposed laterally. The plurality of first plate members 21 are arranged in a transverse direction (i.e., a width direction of the first plate members 21), and two end portions of the plurality of first plate members 21 in a length direction are fixedly connected with the second plate members 22. When the lower shell 2 is formed by splicing and assembling, a proper number of first plates 21 and a proper length of second plates 22 can be selected according to the required overall dimension of the battery pack, and the lower shell 2 can be formed by rapid splicing and assembling, so that the number of parts in stock is reduced, and the production and design cost is controlled.

More specifically, the first plate 21 and the second plate 22 are both provided with a flow passage, both ends of the first plate 21 in the length direction are provided with a first interface 211 communicated with the flow passage, the second plate 22 is provided with a second interface 221 communicated with the flow passage and a plurality of split-flow ports 222, the first interface 211 is correspondingly communicated with the split-flow ports 222, and the second interface 221 is communicated with the liquid cooling plate 42. The refrigerant enters the liquid cooling pipeline 41 from the water inlet 411 passing through the battery pack housing, then enters the second plate 22 through the second interface 221 of the second plate 22 at one end of the first plate 21, enters one end of the first plate 21 through each split port 222 and the first interface 211 respectively, flows into the other second plate 22 from the first interface 211 at the other end of the first plate 21 through the flow passage inside the first plate 21, finally flows back to the liquid cooling pipeline 41 from the second interface 221 of the second plate 22, and flows out of the battery pack through the water outlet 412 passing through the battery pack housing, thereby flowing in the whole lower housing 2 and absorbing heat from the battery cells 51 to form a larger heat absorption area. Preferably, in this embodiment, the first port 211 and the shunt port 222 are correspondingly welded and communicated, so that not only tightness can be ensured, but also the structural strength of the whole lower housing 2 can be improved.

Further, as shown in fig. 7 to 9, the second port 221 is located at one end of the second plate 22, the second plate 22 at least includes a first split port 2221 and a second split port 2222, the first split port 2221 is closer to the second port 221 than the second split port 2222, and the flow area of the first split port 2221 is smaller than that of the second split port 2222, so that the refrigerant flow through the first split port 2221 and the refrigerant flow through the second split port 2222 are the same, thereby ensuring that the refrigerant flow in the two first plates 21 connected to the same second plate 22 are the same, and avoiding the situation that part of the battery cells 51 are overheated. It will be appreciated that, for the second plate 22 having more split-flow ports 222 such as the third split-flow port 222, the specific flow area of the split-flow port 222 can be determined according to the distance between the split-flow port 222 and the second port 221, that is, the closer the distance is, the smaller the flow area is, the same technical effect can be achieved, so the number of split-flow ports 222 is not particularly limited in the present utility model.

Optionally, the second plate 22 is further provided with a fastening point 223 and a quick connector 224, where the fastening point 223 is used to fix the battery pack in the vehicle, and the quick connector 224 can be communicated with the quick connector 413 correspondingly disposed on the liquid cooling pipe 41, so as to further increase the tightness and connection efficiency between the liquid cooling pipe 41 and the second plate 22.

Preferably, as shown in fig. 4 and 7, in the present embodiment, the first plate 21 and the second plate 22 are both hollow plates formed by extrusion, so that the manufacturing cost of the lower case 2 can be further reduced. The hollow plate is extruded in the longitudinal direction and is provided with plugs 202 at both ends in the longitudinal direction. After the plugging member 202 is installed, the refrigerant can only enter and exit the first plate 21 and the second plate 22 through the predetermined ports (i.e., the first port 211, the second port 221, and the split port 222). Optionally, in this embodiment, the blocking member 202 has a notch that forms the first interface 211 described above when mounted to the first plate member 21.

Further, as shown in fig. 5, 6 and 8, the hollow plate has several layers of cavities sequentially arranged in the thickness direction, one layer of cavity is a runner cavity 200 with a runner, the other layer of cavity is a protection cavity 201, the runner cavity 200 is located between the protection cavity 201 and the electric core 51, and when being impacted or supported, the protection cavity 201 can protect the integrity and the tightness of the flow cavity, thereby preventing leakage and the like.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A battery pack, comprising:

the battery cell group (5), a plurality of battery cells (51) are arranged to form the battery cell group (5);

a liquid cooling plate (42), wherein a row of electric cores (51) are clamped between two adjacent liquid cooling plates (42);

the battery pack comprises a lower shell (2), wherein the lower shell (2) is used for supporting the battery pack (5), a runner is arranged in the lower shell (2), the runner is communicated with a liquid cooling plate (42), and a refrigerant flows between the lower shell (2) and the liquid cooling plate (42).

2. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

the battery cell group (5) is of a single-layer structure, a plurality of battery cells (51) are longitudinally arranged to form a row of battery cells (51), and a plurality of rows of battery cells (51) are transversely arranged to form the battery cell group (5).

3. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

structural adhesive is arranged between the battery cells (51) in the same row.

4. The battery pack according to claim 1 or 2, wherein,

a heat conduction structural adhesive is arranged between the battery cell (51) and the lower shell (2),

or, a heat-conducting structural adhesive is arranged between the battery core (51) and the liquid cooling plate (42).

5. The battery pack of claim 1, wherein the battery pack comprises a plurality of battery cells,

the lower shell (2) comprises a first plate (21) and a second plate (22), the length direction of the first plate (21) is perpendicular to the length direction of the second plate (22), a plurality of first plates (21) are arranged in the width direction of the first plates (21), and two ends of the length direction of the first plates (21) are fixedly connected with the second plate (22).

6. The battery pack of claim 5, wherein the battery pack comprises a plurality of battery cells,

the first plate (21) and the second plate (22) are both provided with the runner, the first plate (21) is provided with a first interface (211) communicated with the runner, the second plate (22) is provided with a second interface (221) communicated with the runner and a plurality of split ports (222), the first interface (211) is correspondingly communicated with the split ports (222), and the second interface (221) is communicated with the liquid cooling plate (42).

7. The battery pack of claim 6, wherein the battery pack comprises a plurality of battery cells,

the plurality of shunt ports (222) at least comprise a first shunt port (2221) and a second shunt port (2222), the first shunt port (2221) is close to the second shunt port (2222) and is arranged close to the second port (221), and the flow area of the first shunt port (2221) is smaller than that of the second shunt port (2222), so that the refrigerant flow passing through the first shunt port (2221) and the second shunt port (2222) is the same.

8. The battery pack of claim 5, wherein the battery pack comprises a plurality of battery cells,

the second plate (22) is also provided with a junction point (223), and the battery pack is fixedly arranged in the vehicle through the junction point (223).

9. The battery pack of claim 5, wherein the battery pack comprises a plurality of battery cells,

the first plate (21) and the second plate (22) are extruded hollow plates.

10. The battery pack of claim 9, wherein the battery pack comprises a plurality of battery cells,

the hollow plate is provided with a plurality of layers of cavities which are sequentially arranged in the thickness direction, one layer of cavity is a runner cavity (200) with a runner, the other layer of cavity is a protection cavity (201), and the runner cavity (200) is positioned between the protection cavity (201) and the electric core (51).