Liquid cooling plate for battery pack and battery pack

Abstract

The utility model relates to the technical field of energy storage equipment, in particular to a liquid cooling plate for a battery pack and the battery pack, the liquid cooling plate comprises a cooling plate body, a continuously arranged flow channel formed in the cooling plate body, a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are respectively positioned at two ends of the flow channel, and the flow channel comprises a plurality of passages which are sequentially connected in series; the multiple channels extend in the first direction and are arranged at intervals in the second direction perpendicular to the first direction, the channels comprise the first channel, the second channel, the third channel and the fourth channel, the first channel and the second channel are located between the third channel and the fourth channel, and the liquid inlet and the liquid outlet are located at one end of the first channel and one end of the fourth channel respectively. The liquid cooling plate further comprises a reinforcing plate connected to one side of the cold plate body in the thickness direction. According to the utility model, under the condition that the plurality of battery cell modules are in one-to-one correspondence with the plurality of passages of the flow channel, the reinforcing plate for reinforcing the cold plate body is arranged, so that the bending deformation of the cold plate body can be prevented, and the normal use of the liquid cooling plate is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage equipment, and in particular to a liquid cooling plate for a battery pack and a battery pack. Background Art

[0002] In a battery pack, excessively high, too low, and uneven cell temperatures will affect the performance of the battery pack. When the temperature is too low, its available capacity is reduced and the charging and discharging power is limited. In this case, if the power of the battery pack is not limited, lithium precipitation will occur, causing irreversible decay of the battery pack capacity, and further causing thermal runaway. When the temperature of the battery pack is too high, a violent chemical reaction will occur inside the cell, generating a large amount of heat. If the heat cannot be dissipated in time, the cell may leak, release gas, smoke, etc. In severe cases, it may cause the cell to burn violently and explode. Excessive temperature differences inside the battery pack will cause uneven internal impedance, which will affect the performance of the battery pack and accelerate capacity decay.

[0003] There are currently three main solutions for controlling the temperature of battery packs: natural heat exchange, liquid cooling, and air cooling. Compared with the other two solutions, liquid cooling has the advantages of high heat dissipation efficiency, good temperature difference control, and low power required. When liquid cooling the battery pack, a liquid cooling plate is required. When the existing liquid cooling plate bears the weight of the battery module, it will bend and deform due to its own insufficient strength, making it impossible to use the liquid cooling plate normally. Utility Model Content

[0004] The utility model aims to provide a liquid cooling plate which is not easily deformed and a battery pack comprising the same.

[0005] To achieve the above-mentioned purpose, the utility model proposes a liquid cooling plate for a battery pack, comprising a cold plate body, a flow channel formed in the cold plate body and arranged continuously, and a liquid inlet and a liquid outlet respectively located at both ends of the flow channel, wherein the flow channel comprises a plurality of passages connected in series in sequence, wherein the plurality of passages extend along a first direction and are arranged at intervals along a second direction perpendicular to the first direction, wherein the passages comprise a first passage, a second passage, a third passage, and a fourth passage, wherein the first passage and the second passage are located between the third passage and the fourth passage, the liquid inlet and the liquid outlet are respectively located at one end of the first passage and one end of the fourth passage, and the liquid cooling plate further comprises a reinforcing plate connected to one side of the cold plate body in the thickness direction.

[0006] As a further improvement of the present invention, the cold plate body includes a flow channel plate and a cover plate connected to one side of the flow channel plate in the thickness direction; the flow channel plate includes a flow channel plate body, a flow channel groove formed by a recessed arrangement from the flow channel plate body to one side of the cover plate, and a raised portion corresponding to the flow channel groove; the raised portion and the cover plate are arranged to form the flow channel; and the reinforcing plate is connected to the side of the flow channel plate facing away from the cover plate.

[0007] As a further improvement of the present invention, the protrusion includes a plurality of passage protrusions respectively corresponding to the plurality of passages, and the reinforcing plate and the plurality of passage protrusions are arranged in a cross shape.

[0008] As a further improvement of the present invention, the reinforcing plate includes two connecting sections connected to the flow channel plate and arranged opposite to each other, a beam section spaced apart from the two connecting sections in the thickness direction of the cold plate body, and two transition sections respectively connecting the beam section and the two connecting sections.

[0009] As a further improvement of the present invention, the cross beam section includes a first groove formed from one side thereof in the thickness direction of the cold plate body, and a first convex rib corresponding to the first groove.

[0010] As a further improvement of the present invention, the raised portion includes a raised portion body, a plurality of second grooves formed on a side of the raised portion body away from the cover plate in the thickness direction of the cold plate body, and a plurality of second ribs corresponding to the plurality of second grooves, and the plurality of second ribs are arranged at intervals along the extension direction of the flow channel.

[0011] As a further improvement of the present invention, a plurality of the second convex ribs are also arranged at intervals along the width direction of the flow channel, and the plurality of the second convex ribs divide the flow channel into a plurality of sub-channels arranged at intervals along the width direction of the flow channel.

[0012] As a further improvement of the utility model, the flow channel plate and the cover plate are made of metal material, and the cover plate is welded to the flow channel plate.

[0013] As a further improvement of the present invention, the liquid cooling plate also includes a liquid inlet joint connected to the liquid inlet, a liquid outlet joint connected to the liquid outlet, and a frame having a receiving cavity, the cold plate body is arranged in the receiving cavity, and the liquid inlet joint and the liquid outlet joint are connected to the frame.

[0014] The utility model also provides a battery pack, which includes the above-mentioned liquid cooling plate and a battery core module bonded to the liquid cooling plate.

[0015] Beneficial effects of the utility model:

[0016] The liquid cooling plate and battery pack for a battery pack provided by the utility model are provided with a reinforcing plate for reinforcing the cold plate body when a plurality of battery cell modules can correspond one-to-one to a plurality of passages of the flow channel, so as to prevent the cold plate body from bending and deforming and ensure the normal use of the liquid cooling plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A schematic structural diagram of a liquid cooling plate for a battery pack is provided for one embodiment of the utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of the flow channel of the intercooler plate body;

[0019] Figure 3 for Figure 1 A schematic diagram of the top view of the intercooler plate body;

[0020] Figure 4 for Figure 3 A part of the cross-sectional view of the cold plate body cut along the AA direction;

[0021] Figure 5 for Figure 1 Schematic diagram of the structure of the middle reinforcement plate;

[0022] Figure 6 for Figure 5 A schematic cross-sectional view of the reinforcement plate after being cut along the BB direction;

[0023] Figure 7 for Figure 1 Schematic diagram of the structure of the intercooler plate body;

[0024] Figure 8 for Figure 1 Another structural diagram of the liquid cooling plate.

[0025] In the figure:

[0026] 10. Liquid cooling plate;

[0027] 1. cold plate body; 11. flow channel plate; 111. flow channel plate body; 112. flow channel groove; 113. raised portion; 1131. passage raised portion; 1132. second groove; 1133. second rib; 1134. first spoiler; 1135. second spoiler; 12. cover plate; 1136. raised portion body;

[0028] 2. flow channel; 21. passage; 211. first passage; 212. second passage; 213. third passage; 214. fourth passage;

[0029] 3. Liquid inlet;

[0030] 4. Liquid outlet;

[0031] 5. reinforcing plate; 51. connecting section; 52. crossbeam section; 521. first groove; 522. first convex rib; 53. transition section; 54. notch;

[0032] 6. Frame; 61. Accommodating cavity; 62. Liquid inlet connector; 63. Liquid outlet connector. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, the embodiments do not limit the present invention, and any changes in mechanism, method, or function made by a person skilled in the art based on the embodiments are all within the protection scope of the present invention.

[0034] The terms used herein, such as "upper", "lower", "left", "right", "front", "back", etc., which indicate relative spatial positions, are used for the purpose of convenience to describe the relationship between one feature and another feature as shown in the accompanying drawings. It is understood that, depending on the placement of the product, the terms of relative spatial positions may be intended to include different orientations other than those shown in the drawings, and should not be construed as limitations on the claims. In addition, the descriptor "horizontal" used herein is not completely equivalent to being perpendicular to the direction of gravity, and a certain angle of inclination is allowed.

[0035] An embodiment of the present invention provides a battery pack, which includes: Figure 1 The liquid cooling plate 10 shown and the battery cell module in contact with the liquid cooling plate 10, the heat generated by the battery cell module during use can be conducted to the liquid cooling plate 10, and the inside of the liquid cooling plate 10 can be provided with heat exchange liquid to flow to take away the heat conducted from the battery cell module to the liquid cooling plate 10, thereby achieving the effect of dissipating heat for the battery cell module.

[0036] Continue to combine Figure 2-7 As shown, the liquid cooling plate 10 includes a cold plate body 1, a flow channel 2 formed in the cold plate body 1 and arranged continuously, and a liquid inlet 3 and a liquid outlet 4 respectively located at both ends of the flow channel 2. When the liquid cooling plate 10 is in use, the heat exchange liquid can flow into the flow channel 2 from the liquid inlet 3, and after flowing through the flow channel 2, it flows out of the flow channel 2 from the liquid outlet 4. When the heat exchange liquid flows through the flow channel 2, it can absorb and take away the heat generated by the battery cell module.

[0037] The flow channel 2 includes a plurality of passages 21 connected in series, the plurality of passages 21 extend in a first direction and are arranged at intervals in a second direction perpendicular to the first direction, the passages 21 include a first passage 211, a second passage 212, a third passage 213, and a fourth passage 214 connected in series, wherein the first passage 211 and the second passage 212 are located between the third passage 213 and the fourth passage 214, the liquid inlet 3 and the liquid outlet 4 are respectively located at one end of the first passage 211 and one end of the fourth passage 214. The heat exchange liquid can flow into the first passage 211 from the liquid inlet 3, then flow through the second passage 212, the third passage 213, and the fourth passage 214 in sequence, and finally flow out of the fourth passage 214 from the liquid outlet 4 on the fourth passage 214.

[0038] When the battery cell modules are arranged, they can be arranged one by one with multiple passages 21, that is, the number of battery cell modules is equal to the number of passages 21, and the battery cell modules are arranged above the corresponding passages 21, so that the heat exchange fluid can fully absorb and take away the heat on the battery cell modules. In this embodiment, the number of passages 21 is 4. In other embodiments, the number of passages 21 can also be more than 4, which is not limited here.

[0039] The liquid cooling plate 10 also includes a reinforcing plate 5 connected to one side of the cold plate body 1 in the thickness direction. The reinforcing plate 5 can improve the ability of the cold plate body 1 to resist bending and deformation, thereby preventing the cold plate body 1 from bending and deforming when bearing the weight of the battery module, thereby affecting the normal use of the liquid cooling plate 10.

[0040] Specifically, the cold plate body 1 includes a flow channel plate 11, a cover plate 12 connected to one side of the flow channel plate 11 in the thickness direction, the flow channel plate 11 includes a flow channel plate body 111, a flow channel groove 112 formed by a concave arrangement on one side of the flow channel plate body 111 close to the cover plate 12, and a protrusion 113 corresponding to the flow channel groove 112, the protrusion 113 and the cover plate 12 are arranged to form the flow channel 2, and the reinforcing plate 5 is connected to the side of the flow channel plate 11 away from the cover plate 12. The flow channel plate 11 and the cover plate 12 are made of metal material.

[0041] The flow channel groove 112 and the protrusion 113 on the flow channel plate 11 are formed by a stamping process. The protrusion 113 not only surrounds the flow channel groove 112, but also plays a role similar to a reinforcing rib to prevent the flow channel plate 11 from deforming. The flow channel plate 11 and the cover plate 12 are connected by welding to ensure the connection strength between the two. When the liquid cooling plate 10 is in use, the battery module is specifically in contact with the cover plate 12.

[0042] The raised portion 113 includes a plurality of passageway raised portions 1131 respectively corresponding to the plurality of passageways 21. The passageway 21 extends along the first direction, so the passageway raised portions 1131 also extend along the first direction. The reinforcing plate 5 extends along the second direction, or along an inclined direction inclined to the first direction, so as to be cross-shaped with the passageway raised portions 1131. In this way, the passageway 21 raised portions and the reinforcing plate 5 cooperate to improve the anti-bending deformation capability of the cold plate body 1 in different directions. Specifically, a plurality of reinforcing plates 5 may be arranged at intervals along the first direction, and the plurality of reinforcing plates 5 and the plurality of passageway raised portions 1131 may be in a mesh structure to further improve the anti-bending deformation capability of the cold plate body 1. The correspondence between the passageway 21 and the passageway raised portions 1131 should be understood as the passageway 21 being formed by the passageway raised portions 1131 corresponding thereto.

[0043] The reinforcing plate 5 can be integrally connected to the flow channel plate 11 by means such as welding. Specifically, a notch 54 corresponding to the passage protrusion 1131 can be formed on the reinforcing plate 5, so that at least part of the reinforcing plate 5 fits on the flow channel plate body 111 and the passage protrusion 1131.

[0044] The reinforcing plate 5 is generally in a "ji" shape, including two connecting segments 51 connected to the flow channel plate 11 and arranged oppositely, a cross beam segment 52 spaced from the two connecting segments 51 in the thickness direction of the cold plate body 1, and transition segments 53 connecting the cross beam segment 52 and the two connecting segments 51 respectively. Compared with the flat-shaped reinforcing plate 5, the "ji"-shaped reinforcing plate 5 has better anti-bending deformation ability.

[0045] Further, the cross beam segment 52 includes a first groove 521 recessed from one side of it in the thickness direction of the cold plate body 1 and a first rib 522 corresponding to the first groove 521. The first rib 522 can further improve the anti-bending deformation ability of the reinforcing plate 5. On one reinforcing plate 5, a plurality of first ribs 522 can be formed, and the first ribs 522 extend along the second direction.

[0046] The protrusion 113 includes a protrusion body 1136, a plurality of second grooves 1132 recessed from the side of the protrusion body 1136 away from the cover plate 12 in the thickness direction of the cold plate body 1, and a plurality of second ribs 1133 corresponding to the plurality of second grooves 1132. The plurality of second ribs 1133 are arranged at intervals along the extension direction of the flow channel 2, and the second ribs 1133 can further improve the anti-bending deformation ability of the protrusion 113.

[0047] Further, the plurality of second ribs 1133 are also distributed at intervals along the width direction of the flow channel 2. The plurality of ribs divide the flow channel 2 into a plurality of sub-channels arranged at intervals along the width direction of the flow channel 2. When the heat exchange liquid flows through the flow channel, specifically, it flows in the plurality of sub-channels. When the heat exchange liquid flows in the plurality of sub-channels, its flow direction is not easily disordered. It should be noted that the width direction of the flow channel 2 should be understood as the direction perpendicular to the extension direction of the flow channel 2. That is, when the flow channel 2 extends along the first direction, the width direction of the flow channel 2 is the second direction; when the flow channel 2 extends along the second direction, the width direction of the flow channel 2 is the second direction.

[0048] The flow channel plate 11 is also formed with a first spoiler 1134 and a second spoiler 1135 located in the flow channel 2. The first spoiler 1134 is specifically located between the liquid inlet 3 and the inlet ends of the multiple sub-channels near the liquid inlet 3, and the second spoiler 1135 is specifically located between the liquid outlet 4 and the outlet ends of the multiple sub-channels near the liquid outlet 4. The first spoiler 1134 can guide the heat exchange liquid to flow from the liquid inlet 3 to the inlet ends of the multiple sub-channels, and the second spoiler 1135 can guide the heat exchange liquid to flow from the outlet ends of the multiple sub-channels to the liquid outlet 4. The first spoiler 1134 and the second spoiler 1135 can be specifically formed on the flow channel plate 11 by stamping.

[0049] like Figure 8 As shown, the liquid cooling plate 10 also includes a liquid inlet joint 62 connected to the liquid inlet 3, a liquid outlet joint 63 connected to the liquid outlet 4, and a frame 6 having a receiving cavity 61. The cold plate body 1 is arranged in the receiving cavity 61, and the liquid inlet joint 62 and the liquid outlet joint 63 are connected to the frame 6. The liquid inlet joint 62 and the liquid outlet joint 63 are used to connect pipelines. The heat exchange liquid can flow from the liquid inlet 3 into the flow channel 2 through the pipeline. After flowing through the flow channel 2, the heat exchange liquid can flow out from the liquid outlet 4 to other places through the pipeline connected to the liquid outlet joint 63.

[0050] It should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0051] The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A liquid cooling plate for a battery pack, characterized in that: It includes a cold plate body, a flow channel formed in the cold plate body and arranged continuously, and a liquid inlet and a liquid outlet are respectively located at both ends of the flow channel, the flow channel includes a plurality of passages connected in series in sequence, the plurality of passages extend along a first direction and are arranged at intervals along a second direction perpendicular to the first direction, the passages include a first passage, a second passage, a third passage, and a fourth passage, wherein the first passage and the second passage are located between the third passage and the fourth passage, the liquid inlet and the liquid outlet are respectively located at one end of the first passage and one end of the fourth passage, and the liquid cooling plate also includes a reinforcing plate connected to one side of the cold plate body in the thickness direction.

2. The liquid cooling plate according to claim 1, characterized in that: The cold plate body includes a flow channel plate and a cover plate connected to one side of the flow channel plate in the thickness direction. The flow channel plate includes a flow channel plate body, a flow channel groove formed by a recessed arrangement from the flow channel plate body to one side of the cover plate, and a raised portion corresponding to the flow channel groove. The raised portion and the cover plate are arranged to form the flow channel. The reinforcing plate is connected to the side of the flow channel plate facing away from the cover plate.

3. The liquid cooling plate according to claim 2, characterized in that: The protrusions include a plurality of passage protrusions respectively corresponding to the plurality of passages, and the reinforcing plate and the plurality of passage protrusions are arranged in a cross shape.

4. The liquid cooling plate according to claim 3, characterized in that: The reinforcing plate includes two connecting sections connected to the flow channel plate and arranged opposite to each other, a beam section spaced apart from the two connecting sections in the thickness direction of the cold plate body, and two transition sections respectively connecting the beam section and the two connecting sections.

5. The liquid cooling plate according to claim 4, characterized in that: The cross beam section includes a first groove formed from one side of the cross beam section in the thickness direction of the cold plate body and a first convex rib corresponding to the first groove.

6. The liquid cooling plate according to claim 2, characterized in that: The raised portion includes a raised portion body, a plurality of second grooves formed on a side of the raised portion body away from the cover plate in the thickness direction of the cold plate body, and a plurality of second ribs corresponding to the plurality of second grooves, wherein the plurality of second ribs are arranged at intervals along the extension direction of the flow channel.

7. The liquid cooling plate according to claim 6, characterized in that: The plurality of second convex ribs are also arranged at intervals along the width direction of the flow channel, and the plurality of second convex ribs divide the flow channel into a plurality of sub-channels arranged at intervals along the width direction of the flow channel.

8. The liquid cooling plate according to claim 2, characterized in that: The flow channel plate and the cover plate are made of metal materials, and the cover plate is welded to the flow channel plate.

9. The liquid cooling plate according to claim 1, characterized in that: The liquid cooling plate further comprises a liquid inlet joint connected to the liquid inlet, a liquid outlet joint connected to the liquid outlet, and a frame having a receiving cavity, the cold plate body is arranged in the receiving cavity, and the liquid inlet joint and the liquid outlet joint are connected to the frame.

10. A battery pack, characterized in that: It comprises the liquid cooling plate as described in any one of claims 1 to 9, and a battery cell module bonded to the liquid cooling plate.

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