Battery pack and vehicle

Abstract

The battery pack comprises a battery shell, a battery module and an adsorption part, the battery shell comprises a bottom plate, the battery module comprises a single battery and a temperature adjusting assembly, the temperature adjusting assembly is used for circulation of a temperature adjusting medium so as to adjust the temperature of the single battery, the battery module is fixed in the battery shell, and the adsorption part is fixed in the battery shell. The battery module and the bottom plate are arranged in a spaced mode, the adsorption part is arranged between the battery module and the bottom plate, and the adsorption part is used for adsorbing a temperature adjusting medium leaked by the temperature adjusting assembly and / or liquid entering the battery shell from the outside under the condition of micro leakage of the battery shell. According to the battery pack disclosed by the utility model, the condition of short-circuit thermal runaway easily caused by leakage of cooling liquid is improved, and the use safety of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack and a vehicle. Background Art

[0002] In recent years, new energy vehicles have developed rapidly. As the power source of new energy vehicles, the performance and safety of power batteries have also been of great concern to consumers. However, power batteries in the existing technology still have problems such as easy short circuit thermal runaway and low safety protection level. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the utility model proposes a battery pack, which improves the situation where external liquid can easily penetrate into the battery pack due to leakage or micro-leakage of the temperature control medium and cause short circuit thermal runaway, thereby improving the safety of the battery pack.

[0005] An embodiment of the utility model further provides a vehicle including the above-mentioned battery pack.

[0006] The battery pack of the embodiment of the utility model comprises: a battery case, wherein the battery case comprises a bottom plate;

[0007] A battery module, the battery module comprising a single battery and a temperature regulating component, the temperature regulating component is used for circulating a temperature regulating medium to regulate the temperature of the single battery, the battery module is arranged in the battery shell, and the battery module is spaced apart from the bottom plate;

[0008] An adsorbent is disposed between the battery module and the bottom plate, and is used to absorb the temperature regulating medium leaked from the temperature regulating component and / or the liquid entering the battery shell from the outside in the case of micro-leakage of the battery shell.

[0009] In some embodiments, a sensor is included, at least part of which is disposed in the battery housing, and the sensor is used to monitor the leakage of the temperature regulating medium.

[0010] In some embodiments, the sensor is disposed in the adsorption element or adjacent to the adsorption element, and the sensor is used to monitor the amount of the temperature regulating medium adsorbed by the adsorption element.

[0011] In some embodiments, the adsorption members are provided in plurality, and the plurality of adsorption members are evenly distributed between the battery module and the bottom plate, and at least some of the adsorption members are provided with the sensor.

[0012] In some embodiments, the bottom plate is provided with a groove, the notch of the groove faces the battery module, and the sensor is disposed in the groove.

[0013] In some embodiments, an alarm device is included, and the alarm device is used to alarm when the leakage amount exceeds a set threshold.

[0014] In some embodiments, the battery shell includes a shell, which is frame-shaped and fixedly connected to the base plate. The battery module is located in the shell, and in the thickness direction along the base plate, the ratio of the projection of the adsorbent to the projection of the base plate enclosed by the shell is not less than 90%.

[0015] In some embodiments, the battery shell includes a cover body, the shell is connected between the cover body and the bottom plate, a first seal is provided between the cover body and the shell, a second seal is provided between the bottom plate and the shell, and the battery module is bonded and fixed to the inner side of the cover body by an adhesive layer.

[0016] In some embodiments, the distance between the battery module and the bottom plate is L, the thickness of the adsorption member is M, and the ratio of the thickness M to the distance L is 30% to 90%.

[0017] In some embodiments, an insulating layer is included, and the insulating layer is disposed between the adsorbent and the battery module.

[0018] In some embodiments, a plurality of drain valves are included, and the plurality of drain valves are all disposed on the bottom plate, and the plurality of drain valves are all disposed adjacent to the circumferential edge of the bottom plate and are arranged at intervals along the circumference of the bottom plate;

[0019] And / or, the absorbent is a sponge or foam.

[0020] The vehicle of the embodiment of the utility model includes a battery pack as described in any of the above embodiments.

[0021] Beneficial effects: The battery pack and vehicle of the embodiments of the utility model improve the situation where external liquid easily penetrates into the battery pack due to leakage or micro-leakage of the temperature control medium and easily causes short circuit thermal runaway, thereby improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of an explosion of a battery pack according to an embodiment of the utility model.

[0023] Figure 2 It is a cross-sectional schematic diagram of a battery pack according to an embodiment of the utility model.

[0024] Figure 3 yes Figure 2A partially enlarged schematic diagram of the cross-sectional schematic diagram of the battery pack.

[0025] Figure 4 It is a schematic diagram of the groove of the bottom plate of the battery pack according to an embodiment of the utility model.

[0026] Figure 5 It is a schematic diagram of the arrangement of the adsorption components of the battery pack according to an embodiment of the utility model.

[0027] Figure 6 Another embodiment of the utility model Figure 2 A partially enlarged schematic diagram of the cross-sectional schematic diagram of the battery pack.

[0028] Reference numerals:

[0029] 1-battery shell; 11-bottom plate; 111-groove; 12-shell; 13-cover;

[0030] 2-battery module; 21-single battery; 22-temperature control component;

[0031] 3- first seal;

[0032] 4- Second sealing member;

[0033] 5- Adhesive layer;

[0034] 6- Adsorption parts;

[0035] 7-Drain valve;

[0036] 8-Insulation layer. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0038] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0039] At present, in order to prevent the power battery from overheating during use, the power battery is usually equipped with a cold plate or other structure for cooling the battery cell. However, in actual use, due to bumps, force extrusion, sealing failure and other reasons, there is a risk of leakage of the coolant in the cold plate. When a large amount of coolant leaks in the battery pack, the flowing coolant can easily cause a short circuit in the electrical components inside the battery pack, which can easily induce thermal runaway of the battery pack and reduce the overall safety performance of the battery pack.

[0040] like Figure 1 and Figure 2As shown, the battery pack of the embodiment of the utility model includes a battery shell 1, a battery module 2 and an adsorption member 6.

[0041] The battery case 1 includes a bottom plate 11, such as Figure 1 As shown, the battery case 1 may be substantially in the shape of a rectangular parallelepiped and may be a box structure, the bottom plate 11 may be disposed on the bottom side of the battery case 1 , and the bottom plate 11 may be substantially arranged horizontally.

[0042] The battery module 2 includes a single battery 21 and a temperature regulating assembly 22 . The temperature regulating assembly 22 is used for circulating a temperature regulating medium to regulate the temperature of the single battery 21 . The battery module 2 is fixed in the battery shell 1 , and the battery module 2 is spaced apart from the bottom plate 11 .

[0043] For example, Figures 1 to 3 As shown, the battery module 2 may include a plurality of single cells 21, and the plurality of single cells 21 may be arranged in a matrix. Figure 3 As shown, the temperature control component 22 may include a liquid cooling plate, pipelines, etc. There may be multiple liquid cooling plates, and the multiple liquid cooling plates may be arranged in parallel and spaced apart in the left-right direction. The above-mentioned single battery 21 may be provided between any two adjacent liquid cooling plates.

[0044] When in use, a temperature regulating medium can flow through the temperature regulating component 22, and the circulating temperature regulating medium can exchange heat with the corresponding single cell 21, thereby regulating the operating temperature of the single cell 21, avoiding the situation where the operating temperature of the single cell 21 is too high or too low, and ensuring the operating performance of the single cell 21.

[0045] During assembly, the battery module 2 can be suspended in the battery housing 1, such as Figure 2 and Figure 3 As shown, the battery module 2 is located above the bottom plate 11 and is arranged at a certain distance from the bottom plate 11. Therefore, when the above-mentioned liquid cooling plate, pipeline, etc. leak, the leaked coolant can be gathered on the bottom plate 11 under the action of gravity, and because the battery module 2 is higher than the bottom plate 11 by a certain distance, the leaked coolant is prevented from contacting the battery module 2, thereby achieving a certain protective effect.

[0046] The adsorbent 6 is disposed between the battery module 2 and the bottom plate 11 , and is used to absorb the temperature regulating medium leaked from the temperature regulating assembly 22 and / or the liquid entering the battery shell 1 from the outside in the case of micro-leakage of the battery shell 1 .

[0047] For example, Figure 2 and Figure 3As shown, the adsorbent 6 can be laid on the upper surface of the bottom plate 11, and the adsorbent 6 can be specifically made of foam, sponge, and other materials that can absorb liquid. When in use, the leaked coolant can be absorbed and collected by the adsorbent 6, thereby avoiding the coolant from flowing freely in the battery shell 1, thereby avoiding the situation where the electrical components are easily short-circuited due to the large flow uncertainty of the coolant, improving the situation where short-circuit thermal runaway is easily caused by coolant leakage, and improving the safety of the battery pack.

[0048] It should be noted that in some other embodiments, since the sealing ring of the battery pack is prone to failure after long-term use, and the battery pack is prone to microcracks due to long-term bumps or friction and collision, the battery pack is prone to microleakage. In this state, external liquids such as water can easily enter the battery pack, and the drain valve 7 on the battery pack will be opened under the action of the liquid, thereby reducing the airtightness of the battery pack.

[0049] In view of the above situation, the additional adsorption member 6 can also play the role of absorbing liquids such as water that penetrate into the battery pack from the outside in the case of micro-leakage, and further avoid short-circuit thermal runaway caused by liquid.

[0050] In some embodiments, the battery pack includes sensors, at least part of which is disposed in the battery shell 1, and the sensors are used to monitor the leakage of the temperature regulating medium. For example, one or more sensors may be provided, and the sensors may be assembled in the battery shell 1 and may be located at the bottom of the battery shell 1. When in use, the sensors may monitor the leakage of the temperature regulating medium, thereby facilitating the user to timely understand the leakage of the temperature regulating medium.

[0051] Optionally, the sensor may be a liquid level gauge, a liquid monitor, or the like.

[0052] In some embodiments, the sensor is disposed in the adsorption member 6 or adjacent to the adsorption member 6 , and the sensor is used to monitor the amount of the temperature regulating medium adsorbed by the adsorption member 6 .

[0053] For example, the sensor can be a liquid monitor, etc. The sensor can be buried at a certain height of the adsorption component 6. When the coolant adsorbed in the adsorption component 6 reaches a certain height, the sensor can monitor the coolant in time, thereby realizing the monitoring of the leakage amount of the temperature control medium.

[0054] In some other embodiments, the sensor may also be disposed in the battery housing 1 . In this case, the sensor may be fitted with the adsorption member 6 , thereby also enabling monitoring of the temperature regulating medium adsorbed by the adsorption member 6 .

[0055] In some embodiments, a plurality of adsorption members 6 are provided, and the plurality of adsorption members 6 are evenly distributed between the battery module 2 and the bottom plate 11 , and at least some of the adsorption members 6 are provided with sensors.

[0056] For example, Figure 5 As shown, the adsorption member 6 can be divided into six parts, namely Figure 5 A, B, C, D, E, and F respectively represent an independent adsorption member 6. The six adsorption members 6 can be arranged in a matrix and evenly distributed between the battery module 2 and the bottom plate 11, thereby meeting the need for adsorbing the leaked coolant at various positions between the battery module 2 and the bottom plate 11.

[0057] In accordance with the number of the above-mentioned independent adsorption members 6, six sensors may be provided, and the six sensors may be arranged at the positions of the above-mentioned six adsorption members 6 in a one-to-one correspondence, thereby meeting the need for monitoring leakage conditions at different positions.

[0058] In some embodiments, the alarm of the alarm device can be divided into multiple levels, and the level division can be divided based on the specific situation monitored by each sensor. For example, when less than three of the six sensors send out monitoring signals, it can be considered that there is a leak but the leakage is not serious, and the battery pack inspection and treatment can be delayed. If more than three of the six sensors send out monitoring signals, it is considered that the leakage is serious and the vehicle needs to be stopped immediately.

[0059] Optionally, in some other embodiments, the number of adsorption members 6 may be 7, 8, 9, 10, etc., and the above-mentioned sensors may be arranged only at a part of the adsorption members 6.

[0060] In some embodiments, the bottom plate 11 is provided with a groove 111, the notch of the groove 111 faces the battery module 2, and the sensor is arranged in the groove 111. Figure 4 As shown, the groove 111 can be integrally formed on the top side of the base plate 11 by stamping, the notch of the groove 111 can face upward, the groove 111 can be a rectangular groove, and there can be multiple grooves 111, and the multiple grooves 111 can be evenly distributed on the base plate 11 in a matrix shape, and a sensor can be installed in each groove 111.

[0061] When in use, under the action of gravity, the leaked coolant will gather in the groove 111, thereby improving the monitoring accuracy of the sensor. Secondly, since the groove 111 has the function of storing coolant, the overall page height of the leaked coolant in the battery shell 1 can be reduced, further avoiding the risk of short circuit thermal runaway of the battery pack. In addition, the setting of the groove 111 can also improve the structural strength of the bottom plate 11, thereby enhancing the bottom protection effect of the battery pack.

[0062] Optionally, the groove 111 may also be a circular groove, a triangular groove, an elliptical groove or other groove shapes.

[0063] In some embodiments, the battery pack includes an alarm device, which is used to alarm when the leakage exceeds a set threshold. For example, the sensor can be a liquid level gauge, and the sensor can be set at a certain height position of the battery shell 1. When the liquid level of the leaked coolant reaches the position of the sensor, the sensor will send a monitoring signal, and the corresponding controller can control the alarm device to alarm after receiving the monitoring signal, so that personnel can repair the battery pack in time after receiving the alarm information. For example, after receiving the alarm information, the driver of the vehicle can pull over the vehicle, and then repair the battery pack or wait for rescue, thereby ensuring driving safety.

[0064] In some embodiments, the battery shell 1 includes a shell 12, which is frame-shaped and fixedly connected to the bottom plate 11. The battery module 2 is located in the shell 12, and in the thickness direction along the bottom plate 11, the ratio of the projection of the adsorbent 6 to the projection of the bottom plate 11 enclosed by the shell 12 is not less than 90%.

[0065] For example, Figure 1 As shown, the shell 12 can be in a square frame shape, and the shell 12 can be fixed to the top side of the bottom plate 11 by bolts or other fasteners. The area on the upper surface of the bottom plate 11 surrounded by the shell 12 is the internal area, and the ratio of the projection of the adsorbent 6 in the up-down direction to the projection of the internal area in the up-down direction can be 90%, 93%, 95%, 97%, 98%, etc. Thus, the adsorbent 6 can cover the entire large surface of the bottom plate 11, thereby fully meeting the use needs of adsorbing leaked coolant at various positions.

[0066] In some embodiments, the battery shell 1 includes a cover body 13, a shell 12 is connected between the cover body 13 and the bottom plate 11, a first seal 3 is provided between the cover body 13 and the shell 12, a second seal 4 is provided between the bottom plate 11 and the shell 12, and the battery module 2 is bonded and fixed to the inner side of the cover body 13 by an adhesive layer 5.

[0067] For example, Figure 1 As shown, the cover body 13 can be fixed to the upper side of the shell 12 by fasteners such as bolts, and the first seal 3 and the second seal 4 can both be sealing rings, wherein the first seal 3 can be clamped and fixed between the cover body 13 and the shell 12, and the second seal 4 can be clamped and fixed between the shell 12 and the bottom plate 11, thereby ensuring the sealing of the assembled battery shell 1.

[0068] like Figures 1 to 3 As shown, the adhesive layer 5 may be a structural adhesive, and the adhesive layer 5 may be coated on the inner side (bottom) of the cover body 13 , and the battery module 2 may be bonded and fixed to the cover body 13 via the adhesive layer.

[0069] In some embodiments, Figure 3 As shown, the distance between the battery module 2 and the bottom plate 11 is L, the thickness of the adsorbent 6 is M, and the ratio of the thickness M to the distance L is 30% to 90%. Specifically, the ratio can be 30%, 40%, 50%, 60%, 70%, 80%, 90%, etc.

[0070] Since the adsorption member 6 will adsorb the coolant during use, and after a large number of experimental verifications, limiting the ratio of the thickness dimension M to the distance L within the above range can avoid the situation where the thickness dimension of the adsorption member 6 is too small and the overall adsorption amount is easily low, which fully meets the use needs of fully adsorbing a certain amount of temperature regulating medium;

[0071] On the other hand, it also avoids the situation where the thickness of the adsorbent 6 is too large, which makes it easy for the adsorbent 6 to contact the battery module 2. That is, a certain distance can be created between the adsorbent 6 and the bottom side of the battery module 2, avoiding contact between the adsorbent 6 and the battery module 2, thereby playing a role of separation and protection.

[0072] In some embodiments, the battery pack includes an insulating layer 8, which is disposed between the adsorbent 6 and the battery module 2, for example. Figure 6 As shown, the insulating layer 8 may be an insulating film, etc. The insulating layer 8 may be attached to the bottom of the battery module 2, and the insulating layer 8 may be used to provide insulation protection between the adsorbent 6 and the battery module 2. At this time, no gap may be reserved between the adsorbent 6 and the battery module 2, that is, the ratio of the thickness dimension M to the distance L may be 1.

[0073] In some embodiments, the battery pack includes a plurality of drain valves 7 , and the plurality of drain valves 7 are all disposed on the bottom plate 11 , and the plurality of drain valves 7 are all disposed adjacent to the circumferential edge of the bottom plate 11 and are arranged at intervals along the circumference of the bottom plate 11 .

[0074] For example, Figure 5 As shown, four drain valves 7 can be provided, and the bottom plate 11 can be substantially a rectangular plate. The four drain valves 7 can be respectively provided at the four corners of the bottom plate 11. When in use, the leaked coolant can be discharged through the drain valve 7, thereby playing a role in draining the coolant.

[0075] The following describes a vehicle according to an embodiment of the present utility model.

[0076] The vehicle of the embodiment of the utility model includes a battery pack, and the battery pack may be a battery pack as described in any of the above embodiments. The vehicle may be a new energy vehicle, specifically a car, a bus, a truck, etc. The battery pack of the vehicle of the embodiment of the utility model improves the situation of short circuit thermal runaway due to coolant leakage, and improves the safety of use.

[0077] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: include: A battery case (1), the battery case (1) comprising a bottom plate (11); A battery module (2), the battery module (2) comprising a single battery (21) and a temperature regulating component (22), the temperature regulating component (22) being used for circulating a temperature regulating medium to regulate the temperature of the single battery (21), the battery module (2) being arranged in the battery shell (1), and the battery module (2) and the bottom plate (11) being arranged at a distance; An adsorbent (6), the adsorbent (6) being arranged between the battery module (2) and the bottom plate (11), the adsorbent (6) being used to adsorb the temperature regulating medium leaked from the temperature regulating component (22) and / or the liquid entering the battery shell (1) from the outside in the case of micro-leakage of the battery shell (1).

2. The battery pack according to claim 1, characterized in that: It comprises a sensor, at least part of which is arranged in the battery shell (1), and the sensor is used to monitor the leakage of the temperature regulating medium.

3. The battery pack according to claim 2, characterized in that: The sensor is arranged inside the adsorption element (6) or adjacent to the adsorption element (6), and the sensor is used to monitor the amount of the temperature regulating medium adsorbed by the adsorption element (6).

4. The battery pack according to claim 3, characterized in that: A plurality of the adsorption members (6) are provided, and the plurality of the adsorption members (6) are evenly distributed between the battery module (2) and the bottom plate (11), and at least some of the adsorption members (6) are provided with the sensor.

5. The battery pack according to claim 2, characterized in that: The bottom plate (11) is provided with a groove (111), the notch of the groove (111) faces the battery module (2), and the sensor is arranged in the groove (111).

6. The battery pack according to claim 2, characterized in that: An alarm device is included, and the alarm device is used to alarm when the leakage amount exceeds a set threshold.

7. The battery pack according to claim 1, characterized in that: The battery shell (1) comprises a shell (12), the shell (12) is frame-shaped and is connected and fixed to the bottom plate (11), the battery module (2) is located in the shell (12), and in the thickness direction of the bottom plate (11), the ratio of the projection of the adsorption member (6) to the projection of the bottom plate (11) surrounded by the shell (12) is not less than 90%.

8. The battery pack according to claim 7, characterized in that: The battery shell (1) comprises a cover body (13), the shell (12) is connected between the cover body (13) and the bottom plate (11), a first sealing member (3) is provided between the cover body (13) and the shell (12), a second sealing member (4) is provided between the bottom plate (11) and the shell (12), and the battery module (2) is bonded and fixed to the inner side surface of the cover body (13) by an adhesive layer (5).

9. The battery pack according to claim 1, characterized in that: The distance between the battery module (2) and the bottom plate (11) is L, the thickness dimension of the adsorption member (6) is M, and the ratio of the thickness dimension M to the distance L is 30% to 90%.

10. The battery pack according to claim 1, characterized in that: It comprises an insulating layer (8), wherein the insulating layer (8) is arranged between the adsorption member (6) and the battery module (2).

11. The battery pack according to any one of claims 1 to 10, characterized in that: It comprises a plurality of drain valves (7), wherein the plurality of drain valves (7) are all arranged on the bottom plate (11), and the plurality of drain valves (7) are all arranged adjacent to the circumferential edge of the bottom plate (11) and are arranged at intervals along the circumference of the bottom plate (11); And / or, the adsorbent (6) is a sponge or foam.

12. A vehicle, characterized in that: A battery pack comprising any one of claims 1 to 11.

Images