Battery cell liquid cooling device and battery pack

Abstract

The invention relates to the technical field of battery cooling, and discloses a battery cell liquid cooling device and a battery pack, the battery cell liquid cooling device comprises a support member, a plurality of liquid cooling plates and a plurality of battery cells. The two large surfaces of each battery cell are arranged on the adjacent liquid cooling plate, so that the heat exchange area of the battery cell and the liquid cooling plate can be obviously increased, the highest temperature of the battery cell can be controlled in a required range, and the normal work of the battery pack at a relatively low temperature can be ensured, thereby being beneficial to improving the performance of the battery cell and prolonging the service life of the battery cell; and the cooling requirements of the battery pack under the working conditions of fast charging and overcharging can be met. And the liquid cooling plates are arranged outside the large surfaces on the two sides of each battery cell, so that uniform heat dissipation of the battery cells in the thickness direction is facilitated, and the temperature uniformity of all parts in the battery cells can be remarkably improved. In addition, the heat dissipation space is defined by the bottom of the battery cell, the liquid cooling plate and the supporting piece, the heat dissipation effect of the bottom area of the battery cell is improved, and the temperature of the battery cell can be reduced in an auxiliary mode.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cooling, and in particular to a battery cell liquid cooling device and a battery pack. Background Art

[0002] The battery cell generates a lot of heat during the charging and discharging process. If the heat is not dissipated in a timely and effective manner, the battery cell temperature may be too high, which may cause the battery cell performance to deteriorate, shorten its life, and even cause safety accidents. The existing battery cell liquid cooling device includes a liquid cooling plate arranged at the bottom of the battery cell, which has a poor heat dissipation effect; and it is easy to cause the temperature of the battery cell close to the liquid cooling plate to be low, and the temperature of the side away from the liquid cooling plate to be high, resulting in uneven temperature distribution inside the battery cell, which is easy to affect the performance and service life of the battery cell. Summary of the invention

[0003] In view of this, the present invention provides a battery cell liquid cooling device and a battery pack to solve the problems of poor heat dissipation effect and uneven temperature inside the battery cell of the battery cell liquid cooling device in the prior art.

[0004] In a first aspect, the present invention provides a battery core liquid cooling device, comprising:

[0005] Supports;

[0006] A plurality of liquid cooling plates are arranged on the support member in parallel, spaced apart and inclined, and an installation space is enclosed between adjacent liquid cooling plates;

[0007] A plurality of battery cells are arranged in the installation space, and a large surface of each battery cell is arranged on the liquid cooling plate adjacent thereto; the bottom of the battery cell, the liquid cooling plate and the support member form a heat dissipation space.

[0008] Beneficial effects: In the battery cell liquid cooling device of this structure, the two large surfaces of each battery cell are arranged on the liquid cooling plate adjacent to it. Compared with the method of only arranging the liquid cooling plate at the bottom of the battery cell, the heat exchange area between the battery cell and the liquid cooling plate can be significantly increased, so as to control the maximum temperature of the battery cell within the required range, and ensure that the battery pack works normally at a lower temperature, which is conducive to improving the performance of the battery cell and extending the service life of the battery cell, and can meet the cooling requirements of the battery pack under fast charging and super charging conditions. In addition, liquid cooling plates are arranged outside the large surfaces on both sides of each battery cell, and the thickness of the battery cell between the two liquid cooling plates is much smaller than the height of the battery cell, which is conducive to uniform heat dissipation of the battery cell in the thickness direction, and can significantly improve the uniformity of temperature at various locations inside the battery cell, so as to further improve the performance of the battery cell and increase its service life. In addition, the liquid cooling plate is arranged at an angle, the large surface of the battery cell is arranged on the liquid cooling plate, the battery cell is also arranged at an angle, and the bottom of the battery cell is spaced apart from the support member, so as to enclose a heat dissipation space between the bottom of the battery cell, the liquid cooling plate and the support member, which is conducive to improving the heat dissipation effect of the bottom area of ​​the battery cell and can assist in reducing the temperature of the battery cell.

[0009] In an optional embodiment, the inclination angle between the liquid cooling plate and the support member is α, 45°≤α≤75°.

[0010] Beneficial effect: α≥45°, this setting can prevent the liquid cooling plate and the battery cell from tilting downward too much, prevent the liquid cooling plate from being subjected to excessive force, and ensure the stability of the overall structure. At the same time, α≤75°, this setting can ensure that there is enough heat dissipation space at the bottom of the battery cell, which is conducive to ensuring the heat dissipation effect at the bottom of the battery cell.

[0011] In an optional embodiment, a positioning groove is provided on the support member, and the bottom of the liquid cooling plate is arranged in the positioning groove.

[0012] Beneficial effect: The bottom of the liquid cooling plate is arranged in the positioning groove to position the liquid cooling plate, so that the liquid cooling plate can be stably maintained on the support member, and at the same time it is beneficial to improve the supporting effect of the liquid cooling plate on the battery cell, and can improve the stability of the overall structure of the battery cell liquid cooling device.

[0013] In an optional embodiment, it also includes a water inlet pipe and a water outlet pipe; collecting pieces are provided at both ends of the liquid cooling plate, the thickness of the collecting pieces is greater than the thickness of the liquid cooling plate, the collecting pieces are sleeved on the outer peripheral wall of the end of the liquid cooling plate, the collecting pieces have a collecting cavity, and the collecting cavity is connected to the cooling channel of the liquid cooling plate; the water inlet pipe is connected to all the collecting pieces on one side of the liquid cooling plate, and the water outlet pipe is connected to all the collecting pieces on the other side of the liquid cooling plate.

[0014] Beneficial effect: The thickness of the collector is greater than that of the liquid cooling plate, so that it has a larger collector cavity, which is conducive to the coolant flowing into the collector cavity through the water inlet pipe and then flowing into the liquid cooling plate from the collector cavity; it is also convenient for the coolant after heat exchange to flow into the collector and then flow out of the liquid cooling device through the water outlet pipe. The water inlet pipe and the water outlet pipe pass through all the collectors to connect all the liquid cooling plates in series, which is conducive to simplifying the pipeline layout and simplifying the structure of the liquid cooling device.

[0015] In an optional embodiment, the groove width at both ends of the positioning groove is greater than the groove width in the middle, and the bottom of the current collecting member is arranged at the end of the positioning groove.

[0016] In an optional embodiment, along the width direction of the positioning groove, an outer edge of a notch at one end of the positioning groove is provided with an inclined surface connected to the positioning groove, and the bottom of the battery cell abuts against the inclined surface.

[0017] In an optional embodiment, the support member includes an elastic buffer member.

[0018] Beneficial effects: The elastic buffer is elastic, the positioning groove is set on the elastic buffer, and the bottom of the liquid cooling plate and the battery cell are set on the positioning groove and the inclined surface, which can prevent damage to the liquid cooling plate and the battery cell. The elastic buffer can play a buffering role and protect the battery cell and the liquid cooling plate to a certain extent.

[0019] In an optional embodiment, a reinforcement piece is provided on the outer side of the liquid cooling plate at the outer end, and one side of the reinforcement piece is arranged on the supporting piece and the other side supports the liquid cooling plate.

[0020] Beneficial effect: The reinforcement member supports the tilted liquid cooling plate, which can ensure that the liquid cooling plate is stably maintained on the support member, so that the liquid cooling plate stably supports the battery cell, which is beneficial to improving the stability of the overall structure.

[0021] In an optional implementation, a pressure relief structure is provided on one side of the battery cell, and the side of the battery cell provided with the pressure relief structure is arranged toward the heat dissipation space.

[0022] Beneficial effect: When thermal runaway occurs in the battery cell, the hot air is discharged to the heat dissipation space at the bottom of the battery cell, and the hot air is discharged from the bottom of the battery cell liquid cooling device, avoiding harm to personnel, which is beneficial to improving the safety of the battery cell liquid cooling device.

[0023] In a second aspect, the present invention further provides a battery pack, comprising any one of the above-mentioned battery liquid cooling devices and a box, wherein the battery liquid cooling device is arranged in the box. The battery pack includes the battery liquid cooling device, which has the same technical effect as the battery liquid cooling device, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of a battery cell liquid cooling device according to an embodiment of the present invention;

[0026] Figure 2 This is a front view of a battery core liquid cooling device according to an embodiment of the present invention;

[0027] Figure 3 for Figure 2 AA section view;

[0028] Figure 4 A top view of a battery cell liquid cooling device according to an embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of a support member in a battery cell liquid cooling device according to an embodiment of the present invention;

[0030] Figure 6 for Figure 5 A partial enlarged view of the middle A part;

[0031] Figure 7 A schematic diagram of a battery pack according to an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 1. Support member; 11. Positioning groove; 12. Inclined surface; 2. Liquid cooling plate; 3. Battery cell; 4. Heat dissipation space; 5. Water inlet pipe; 6. Water outlet pipe; 7. Current collecting member; 8. Reinforcement member; 9. Box body. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0035] The existing battery cell liquid cooling device includes a liquid cooling plate arranged at the bottom of the battery cell. The contact area between the liquid cooling plate and the battery cell is small, the heat exchange area is small, and the heat dissipation effect is poor. In addition, the temperature of the battery cell close to the liquid cooling plate is low, and the temperature of the battery cell away from the liquid cooling plate is high. The temperature distribution inside the battery cell is uneven, which easily affects the performance and service life of the battery cell.

[0036] Combine the following Figures 1 to 7 , describing an embodiment of the present invention.

[0037] According to an embodiment of the present invention, on one hand, a battery cell 3 liquid cooling device is provided, comprising a support member 1 , a plurality of liquid cooling plates 2 and a plurality of battery cells 3 .

[0038] Among them, multiple liquid cooling plates 2 are arranged on the support member 1 in parallel, spaced apart and inclined, and an installation space is enclosed between adjacent liquid cooling plates 2; multiple battery cells 3 are arranged in the installation space, and the large surface of each battery cell 3 is arranged on the liquid cooling plate 2 adjacent to it; the bottom of the battery cell 3 and the liquid cooling plate 2 and the support member 1 form a heat dissipation space 4.

[0039] In the liquid cooling device for the battery cell 3 of this structure, the two large surfaces of each battery cell 3 are arranged on the liquid cooling plate 2 adjacent to it. Compared with the method of only arranging the liquid cooling plate 2 at the bottom of the battery cell 3, the heat exchange area between the battery cell 3 and the liquid cooling plate 2 can be significantly increased, so as to control the maximum temperature of the battery cell 3 within the required range, and ensure that the battery pack works normally at a lower temperature, which is conducive to improving the performance of the battery cell 3 and extending the service life of the battery cell 3, and can meet the cooling requirements of the battery pack under fast charging and super charging conditions. In addition, liquid cooling plates 2 are arranged outside the large surfaces on both sides of each battery cell 3. The thickness of the battery cell 3 between the two liquid cooling plates 2 is much smaller than the height of the battery cell 3, which is conducive to uniform heat dissipation of the battery cell 3 in the thickness direction, and can significantly improve the uniformity of the temperature at various locations inside the battery cell 3, so as to further improve the performance of the battery cell 3 and increase its service life. In addition, the liquid cooling plate 2 is arranged at an angle, the large surface of the battery cell 3 is arranged on the liquid cooling plate 2, the battery cell 3 is also arranged at an angle, and the bottom of the battery cell 3 is separated from the support 1, so as to form a heat dissipation space 4 between the bottom of the battery cell 3, the liquid cooling plate 2 and the support 1, which is beneficial to improving the heat dissipation effect of the bottom area of ​​the battery cell 3 and can assist in reducing the temperature of the battery cell 3.

[0040] In some embodiments, two large surfaces of the battery cell 3 are bonded and fixed to the surface of the liquid cooling plate 2 through thermal pads. Since the battery cell 3 and the liquid cooling plate 2 are arranged at an angle, the thermal pads can more conveniently fix the battery cell 3 and improve the heat exchange effect between the battery cell 3 and the liquid cooling plate 2.

[0041] In some optional embodiments, the inclination angle between the liquid cooling plate 2 and the support member 1 is α, 45°≤α≤75°. The battery cell 3 is crimped onto the liquid cooling plate 2 and the support member 1, and the liquid cooling plate 2 bears a portion of the gravity of the battery cell 3, α≥45°. This arrangement can prevent the liquid cooling plate 2 and the battery cell 3 from tilting downward too much, prevent the liquid cooling plate 2 from being subjected to excessive force, and ensure the stability of the overall structure. At the same time, α≤75°, this arrangement can ensure that there is sufficient heat dissipation space 4 at the bottom of the battery cell 3, which is conducive to ensuring the heat dissipation effect at the bottom of the battery cell 3.

[0042] In some optional embodiments, Figure 3 and Figure 5 As shown, a positioning groove 11 is provided on the support member 1, and the bottom of the liquid cooling plate 2 is arranged in the positioning groove 11 to position the liquid cooling plate 2, so that the liquid cooling plate 2 can be stably maintained on the support member 1, and at the same time, it is beneficial to improve the supporting effect of the liquid cooling plate 2 on the battery cell 3, and the stability of the overall structure of the liquid cooling device of the battery cell 3 can be improved.

[0043] In some embodiments, the support member 1 is in the shape of a rectangular plate, and is provided with a plurality of parallel and spaced positioning grooves 11. For example, the extending direction of the positioning groove 11 is the length direction of the support member 1, and the plurality of positioning grooves 11 are arranged along the width direction of the support member 1.

[0044] In some embodiments, the battery cells 3 include square shell battery cells 3 , a plurality of square shell battery cells 3 are disposed between every two liquid cooling plates 2 , and narrow side surfaces of the plurality of square shell battery cells 3 are sequentially abutted against each other.

[0045] In some embodiments, the liquid cooling device of the battery cell 3 further includes a water inlet pipe 5 and a water outlet pipe 6; a current collector 7 is provided at both ends of the liquid cooling plate 2, the thickness of the current collector 7 is greater than the thickness of the liquid cooling plate 2, the current collector 7 is sleeved on the outer peripheral wall of the end of the liquid cooling plate 2, and the current collector 7 has a current collecting cavity, and the current collecting cavity is connected to the cooling channel of the liquid cooling plate 2; the water inlet pipe 5 is connected to all the current collectors 7 on one side of the liquid cooling plate 2, and the water outlet pipe 6 is connected to all the current collectors 7 on the other side of the liquid cooling plate 2. The thickness of the current collector 7 is greater than the thickness of the liquid cooling plate 2, so that it has a larger current collecting cavity, which is conducive to the coolant flowing into the collecting cavity through the water inlet pipe 5, and then flowing into the liquid cooling plate 2 from the collecting cavity; at the same time, it is also convenient for the coolant after heat exchange to flow into the collecting cavity 7, and then flow out of the liquid cooling device through the water outlet pipe 6. The water inlet pipe 5 and the water outlet pipe 6 pass through all the current collectors 7 to connect all the liquid cooling plates 2 in series, which is conducive to simplifying the pipeline layout and simplifying the structure of the liquid cooling device.

[0046] like Figure 1 , Figure 5 and Figure 6 As shown, since the thickness of the current collecting member 7 is greater than the thickness of the liquid cooling plate 2, the groove width at both ends of the positioning groove 11 is greater than the groove width in the middle. The bottom of the current collecting member 7 is arranged at the end of the positioning groove 11 to accommodate and position the current collecting member 7 in the positioning groove 11 at the same time, which is beneficial to improving the stability of the overall structure.

[0047] like Figure 6 As shown, in some embodiments, along the width direction of the positioning groove 11, the outer edge of the groove at one end of the positioning groove 11 is provided with an inclined surface 12 connected to the positioning groove 11, and the bottom of the battery cell 3 abuts the inclined surface 12. The inclined surface 12 supports the battery cell 3 to a certain extent, which is beneficial to improving the stability of the battery cell 3.

[0048] Optionally, in some embodiments, the bottoms of the liquid cooling plate 2 and the battery cells 3 are bonded to the support 1 so that the liquid cooling plate 2 and the battery cells 3 are stably maintained at a set position.

[0049] In some optional embodiments, the support member 1 includes an elastic buffer. The elastic buffer is elastic, the positioning groove 11 is arranged on the elastic buffer, and the bottom of the liquid cooling plate 2 and the battery cell 3 is arranged on the positioning groove 11 and the inclined surface 12, which can prevent damage to the liquid cooling plate 2 and the battery cell 3. The elastic buffer can play a buffering role and protect the battery cell 3 and the liquid cooling plate 2 to a certain extent.

[0050] Optionally, in some embodiments, the elastic buffer comprises foam. The foam is light in weight, which is helpful to reduce the weight of the liquid cooling device of the battery cell 3 and the battery pack.

[0051] In some optional embodiments, Figure 3 As shown, a reinforcement member 8 is provided on the outer side of the liquid cooling plate 2 at the outer end, and one side of the reinforcement member 8 is arranged on the support member 1, and the other side supports the liquid cooling plate 2. The reinforcement member 8 supports the tilted liquid cooling plate 2, which can ensure that the liquid cooling plate 2 is stably maintained on the support member 1, so that the liquid cooling plate 2 stably supports the battery cell 3, which is conducive to improving the stability of the overall structure.

[0052] In some embodiments, the reinforcement member 8 includes a wedge-shaped block, which is arranged on the outside of the outer liquid cooling plate 2. The wedge-shaped block has a simple structure and a good supporting effect.

[0053] In some optional embodiments, a pressure relief structure is provided on one side of the battery cell 3, and the side of the battery cell 3 provided with the pressure relief structure is arranged toward the heat dissipation space 4. When thermal runaway occurs in the battery cell 3, hot air is discharged to the heat dissipation space 4 at the bottom of the battery cell 3, and the hot air is discharged from the bottom of the liquid cooling device of the battery cell 3, thereby avoiding harm to personnel and facilitating improving the safety of the liquid cooling device of the battery cell 3.

[0054] In some embodiments, the pressure relief structure includes an explosion-proof valve disposed on the top of the battery cell 3 . The battery cell 3 is inverted, that is, the explosion-proof valve is disposed downward. When thermal runaway occurs in the battery cell 3 , the explosion-proof valve exhausts gas downward.

[0055] In some embodiments, the liquid cooling plate 2 is arranged on both sides of the thickness direction of the battery cell 3. When the battery cell 3 is too thick, the heat exchange effect between the middle area in the thickness direction and the liquid cooling plate 2 will be affected. The ratio of the length and thickness of the battery cell 3 is between 2.5 and 6. This arrangement can prevent the thickness of the battery cell 3 from being too thin or too thick, avoid the battery cell 3 being too thick to affect the heat exchange effect, and prevent the battery cell 3 from being too thin to reduce the volume energy density of the battery pack.

[0056] According to an embodiment of the present invention, on the other hand, a battery pack is provided, comprising any one of the above-mentioned liquid cooling devices for the battery cell 3 and a box body 9 , wherein the liquid cooling device for the battery cell 3 is disposed in the box body 9 .

[0057] In a battery pack of this structure, the two large surfaces of each battery cell 3 are arranged on the liquid cooling plate 2 adjacent to it, which can significantly increase the heat exchange area between the battery cell 3 and the liquid cooling plate 2, so as to control the maximum temperature of the battery cell 3 within the required range, and ensure that the battery pack works normally at a lower temperature, which is beneficial to improving the performance of the battery cell 3 and extending the service life of the battery cell 3. It is also beneficial to uniformly dissipate heat from the battery cell 3 in the thickness direction and improve the uniformity of temperature at various locations inside the battery cell 3. In addition, the liquid cooling plate 2 is arranged at an angle, and a heat dissipation space 4 is enclosed between the bottom of the battery cell 3, the liquid cooling plate 2 and the support 1, which is beneficial to improving the heat dissipation effect of the bottom area of ​​the battery cell 3 and can improve the safety performance of the battery pack.

[0058] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery cell liquid cooling device, characterized in that: include: Supports; A plurality of liquid cooling plates are arranged on the support member in parallel, spaced apart and inclined, and an installation space is enclosed between adjacent liquid cooling plates; A plurality of battery cells are arranged in the installation space, and a large surface of each battery cell is arranged on the liquid cooling plate adjacent thereto; the bottom of the battery cell, the liquid cooling plate and the support member form a heat dissipation space.

2. The battery core liquid cooling device according to claim 1, characterized in that: The inclination angle between the liquid cooling plate and the support member is α, 45°≤α≤75°.

3. The battery core liquid cooling device according to claim 1 or 2, characterized in that: The support member is provided with a positioning groove, and the bottom of the liquid cooling plate is arranged in the positioning groove.

4. The battery core liquid cooling device according to claim 3, characterized in that: It also includes a water inlet pipe and a water outlet pipe; a current collecting piece is provided at both ends of the liquid cooling plate, the thickness of the current collecting piece is greater than the thickness of the liquid cooling plate, the current collecting piece is sleeved on the outer peripheral wall of the end of the liquid cooling plate, the current collecting piece has a current collecting cavity, and the current collecting cavity is connected to the cooling channel of the liquid cooling plate; The water inlet pipe is connected to all the current collecting parts on one side of the liquid cooling plate, and the water outlet pipe is connected to all the current collecting parts on the other side of the liquid cooling plate.

5. The battery core liquid cooling device according to claim 4, characterized in that: The groove widths at both ends of the positioning groove are greater than the groove width in the middle thereof, and the bottom of the current collecting member is arranged at the ends of the positioning groove.

6. The battery core liquid cooling device according to claim 4, characterized in that: Along the width direction of the positioning groove, an outer edge of a notch at one end of the positioning groove is provided with an inclined surface communicating with the positioning groove, and the bottom of the battery cell abuts against the inclined surface.

7. The battery core liquid cooling device according to claim 1 or 2, characterized in that: The support member includes an elastic buffer member.

8. The battery core liquid cooling device according to claim 1 or 2, characterized in that: A reinforcing member is provided on the outer side of the liquid cooling plate at the outer end, and one side of the reinforcing member is arranged on the supporting member and the other side supports the liquid cooling plate.

9. The battery core liquid cooling device according to claim 1 or 2, characterized in that: A pressure relief structure is provided on one side of the battery core, and the side of the battery core provided with the pressure relief structure is arranged toward the heat dissipation space.

10. A battery pack, characterized in that: It comprises the battery cell liquid cooling device and a box body as described in any one of claims 1 to 9, wherein the battery cell liquid cooling device is arranged in the box body.

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