Battery protection plate, battery pack and vehicle

Abstract

The invention discloses a battery protection plate, a battery pack and a vehicle, and the battery protection plate comprises a uniform temperature plate which is provided with an exhaust port for avoiding an anti-explosion valve; the runner plate is connected with the uniform temperature plate, the runner plate and the uniform temperature plate jointly define a cooling runner and an exhaust channel which are spaced, and the exhaust channel is communicated with the exhaust port. According to the battery protection plate disclosed by the invention, gas ejected after the explosion-proof valve is opened can be smoothly discharged, and the ejected high-temperature gas can be cooled, so that the thermal safety of a battery pack is improved, and the safe and efficient operation of the battery pack is ensured.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery shield, a battery pack including the battery shield, and a vehicle including the battery pack. Background Art

[0002] The power batteries in electric vehicles have strict temperature requirements. Working under high or low temperature conditions for a long time will reduce the performance and life of the power batteries, and even pose a major safety hazard. Therefore, how to maintain the operating temperature of the power battery within a suitable temperature range is a pain point in the current industry.

[0003] In the related art, in order to improve the performance of the battery cell, the explosion-proof valve of the battery cell is set at the bottom of the battery cell, which will hinder the opening of the valve and the exhaust of the battery cell, affecting the overall safety of the battery. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery guard plate, which can realize the smooth discharge of the gas ejected after the explosion-proof valve is opened, and can also cool the ejected high-temperature gas, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

[0005] According to an embodiment of the present invention, the battery guard plate includes: a temperature equalizing plate, the temperature equalizing plate is provided with an exhaust port for avoiding an explosion-proof valve; a flow channel plate, the flow channel plate is connected to the temperature equalizing plate and jointly defines a cooling flow channel and an exhaust channel spaced apart, and the exhaust channel is connected to the exhaust port.

[0006] According to the battery guard plate of the embodiment of the present invention, an exhaust port for avoiding the explosion-proof valve and an exhaust channel connected to the exhaust port are provided to avoid interference between the explosion-proof valve and the battery guard plate, thereby achieving smooth discharge of the gas ejected after the explosion-proof valve is opened. At the same time, a cooling flow channel separated from the exhaust channel is provided, which can cool the battery and the ejected high-temperature gas, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

[0007] According to the battery guard plate of some embodiments of the present invention, an exhaust groove is formed on the side of the flow channel plate facing the temperature equalizing plate, and the temperature equalizing plate and the flow channel plate define the exhaust channel at the exhaust groove; and / or a cooling groove is formed on the side of the flow channel plate facing the temperature equalizing plate, and the temperature equalizing plate and the flow channel plate define the cooling flow channel at the cooling groove.

[0008] According to the battery guard plate of some embodiments of the present invention, the exhaust groove and the cooling groove are integrally stamped and formed on the flow channel plate.

[0009] According to some embodiments of the battery guard plate of the present invention, the cooling groove includes a plurality of sub-groove segments, the plurality of sub-groove segments are distributed side by side and connected in series in sequence, and the exhaust groove is located between two adjacent sub-groove segments.

[0010] According to the battery guard plate of some embodiments of the present invention, the flow channel plate is provided with an exhaust hole connected to the exhaust groove.

[0011] According to the battery guard plate of some embodiments of the present invention, the exhaust hole is located at one end of the exhaust groove.

[0012] According to the battery guard plate of some embodiments of the present invention, the temperature equalizing plate has a plurality of battery supporting areas, and the plurality of battery supporting areas are suitable for supporting a plurality of groups of battery cells in a one-to-one correspondence; wherein each of the battery supporting areas is correspondingly formed with the cooling channel and the exhaust channel.

[0013] According to the battery guard plate of some embodiments of the present invention, the exhaust channels corresponding to two adjacent battery supporting areas are distributed at intervals; and / or the cooling channels corresponding to two adjacent battery supporting areas are connected.

[0014] According to the battery guard plate of some embodiments of the present invention, a separation gap is formed between two adjacent battery supporting areas, and the two adjacent battery supporting areas are connected at ends of the separation gap.

[0015] The invention also provides a battery pack.

[0016] A battery pack according to an embodiment of the present invention comprises a battery cell and a battery guard plate according to any one of the above embodiments, wherein the battery guard plate is provided on the top and / or bottom of the battery cell, and the battery cell is provided with an explosion-proof valve directly facing the exhaust port.

[0017] According to the battery pack of some embodiments of the present invention, the cooling channel and the exhaust channel are spaced apart and distributed in a first direction; wherein the first direction is a length direction of the battery cell.

[0018] According to the battery pack of some embodiments of the present invention, the length of the battery cell in the first direction is L, and along the first direction, the distance between the cooling channels on both sides of the exhaust channel is b, and satisfies: b≤L / x, where x is determined according to the specifications of the battery cell.

[0019] According to some embodiments of the battery pack of the present invention, the width of the exhaust channel in the first direction is d, the spacing between the exhaust channel and the cooling channel is c, the battery cell is provided with n explosion-proof valves in the first direction, the spacing between two adjacent explosion-proof valves is e, wherein the spacing between the two outermost explosion-proof valves and the two side edges of the exhaust channel are f1 and f2 respectively, and the width of the explosion-proof valve is a; wherein, b=d+c*2, d=na+ne-e+f1+f2, b=na+ne-e+f1+f2+2c, satisfying: c≥5mm, f1+f2≥0.1a, e≥15mm.

[0020] According to the battery pack of some embodiments of the present invention, the exhaust channel is extended along the second direction; there are multiple battery cells, and the multiple battery cells are arranged in sequence along the second direction, the explosion-proof valves of the multiple battery cells are directly opposite to one exhaust port, and the second direction is perpendicular to the first direction.

[0021] According to the battery pack of some embodiments of the present invention, the second direction is a thickness direction of the battery cell.

[0022] The present invention also provides a vehicle.

[0023] A vehicle according to an embodiment of the present invention comprises a battery pack as described in any one of the above embodiments.

[0024] The advantages of the battery pack, the vehicle and the above-mentioned battery shield compared to the prior art are the same and will not be repeated here.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 is a schematic structural diagram of a battery cell and an explosion-proof valve according to an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of the structure of the battery guard according to an embodiment of the present invention Figure 1 ;

[0029] Figure 3 Schematic diagram of the structure of the battery guard according to an embodiment of the present invention Figure 2 ;

[0030] Figure 4 Schematic diagram of the structure of the battery guard according to an embodiment of the present invention Figure 3 ;

[0031] Figure 5 Schematic diagram of the structure of the battery guard according to an embodiment of the present invention Figure 4 .

[0032] Reference numerals:

[0033] Battery guard 100,

[0034] Temperature averaging plate 1, exhaust port 11, battery support area 12, separation gap 13,

[0035] Channel plate 2, exhaust groove 21, cooling groove 22, sub-groove section 221, exhaust hole 23,

[0036] Cooling channel 31, exhaust channel 32, explosion-proof valve 4, battery cell 5. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Reference below Figure 1-Figure 5 A battery shield 100 according to an embodiment of the present invention is described. The battery shield 100 can achieve smooth discharge of the gas ejected after the explosion-proof valve 4 is opened, and can also cool the ejected high-temperature gas, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

[0041] like Figure 1-Figure 5 A battery protection plate 100 according to an embodiment of the present invention includes: a temperature equalizing plate 1 and a flow channel plate 2 .

[0042] The temperature averaging plate 1 and the flow channel plate 2 can together form a cooler to cool the battery. The temperature averaging plate 1 is mainly used to balance the temperature inside the battery, so that the battery is within the optimal operating temperature range, prevent the battery from overheating or too low, thereby extending the life of the battery. The temperature averaging plate 1 can be set at the bottom, top or side of the battery cell 5, and is in close contact with the battery cell 5. In other words, the battery guard plate 100 can be set at the top, bottom or side of the battery cell 5. The present invention is explained by taking the battery guard plate 100 being set at the bottom of the battery cell 5 as an example.

[0043] like Figure 4 As shown, the temperature homogenizing plate 1 is provided with an exhaust port 11 for avoiding the explosion-proof valve 4. The exhaust port 11 is used to discharge the gas inside the battery. The shape and size of the exhaust port 11 should match the shape and size of the explosion-proof valve 4, so that the explosion-proof valve 4 can pass through the exhaust port 11, thereby avoiding the explosion-proof valve 4 on the battery cell 5, so that the explosion-proof valve 4 can work normally to open the valve for exhaust, so that the airflow at the explosion-proof valve 4 can enter the exhaust channel 32 through the exhaust port 11, thereby realizing the smooth discharge of the gas inside the battery. Figure 4 The explosion-proof valve 4 shown in the figure is arranged at the bottom of the battery cell 5. The explosion-proof valve 4 is an important component for the safe operation of the battery. The explosion-proof valve 4 is avoided and vented by setting the exhaust port 11. In this way, when the internal pressure of the battery is too high, the explosion-proof valve 4 will automatically open to release the pressure to prevent the battery from exploding, thereby improving the safety of the battery.

[0044] Furthermore, the flow channel plate 2 is connected to the temperature homogenizing plate 1 and together define a cooling flow channel 31 and an exhaust channel 32 which are spaced apart from each other. The exhaust channel 32 is in communication with the exhaust port 11 .

[0045] Specifically, the flow channel plate 2 is closely connected to the temperature balancing plate 1. Figure 3 and attached Figure 4As shown, the flow channel plate 2 is connected to the bottom of the temperature equalizing plate 1, and the partial area between the two is separated by a certain distance to form a separated cooling flow channel 31 and exhaust channel 32, that is, the cooling flow channel 31 and the exhaust channel 32 are separately arranged, and the cooling flow channel 31 is used to circulate the coolant to take away the heat generated by the battery to ensure that the battery operates within a safe temperature range, and the exhaust channel 32 is used to discharge the gas inside the battery, wherein the exhaust channel 32 is connected to the exhaust port 11, so that the gas generated after the explosion-proof valve 4 installed at the exhaust port 11 opens the valve to eject the gas can be transported and discharged in the exhaust channel 32 in an orderly manner, thereby preventing the gas from accumulating in the battery and causing safety hazards. At the same time, when exhausting, the temperature equalizing plate 1 and the flow channel plate 2 can cool the ejected high-temperature gas, further improving the thermal safety of the battery without affecting the performance of the battery cell 5.

[0046] Therefore, by providing the exhaust port 11 and the exhaust channel 32 connected to the exhaust port 11, the interference between the explosion-proof valve 4 and the battery guard plate 100 is avoided, and the gas ejected after the explosion-proof valve 4 is opened is smoothly discharged. At the same time, a cooling flow channel 31 separated from the exhaust channel 32 is provided, which can not only cool the battery, but also cool the ejected high-temperature gas, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

[0047] According to the battery guard plate 100 of the embodiment of the present invention, an exhaust port 11 for avoiding the explosion-proof valve 4 and an exhaust channel 32 connected to the exhaust port 11 are provided to avoid interference between the explosion-proof valve 4 and the battery guard plate 100, thereby achieving smooth discharge of the gas ejected after the explosion-proof valve 4 is opened. At the same time, a cooling flow channel 31 separated from the exhaust channel 32 is provided, which can cool the battery and the ejected high-temperature gas, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

[0048] In some embodiments, Figure 3 and Figure 4 As shown, the flow channel plate 2 is formed with an exhaust groove 21 on one side facing the temperature equalizing plate 1, that is, Figure 3 As shown in the up and down directions in the figure, an exhaust groove 21 is formed on the upper side of the flow channel plate 2. The cross-section of the exhaust groove 21 can be set to a rectangular, circular or irregular shape, etc. The temperature equalizing plate 1 and the flow channel plate 2 define an exhaust channel 32 at the exhaust groove 21. The gas generated after the explosion-proof valve 4 opens the valve to eject the gas can flow in the exhaust channel 32 and then be discharged through the exhaust channel 32.

[0049] In other embodiments, Figure 3 and Figure 4As shown, a cooling groove 22 is formed on the side of the flow channel plate 2 facing the temperature averaging plate 1, that is, as shown in the up and down direction in FIG. 3, a cooling groove 22 is formed on the upper side of the flow channel plate 2, and the cross-section of the exhaust groove 21 can be set to a rectangular, circular or irregular shape, etc. The temperature averaging plate 1 and the flow channel plate 2 define a cooling channel 31 at the cooling groove 22, and the coolant can circulate in the cooling channel 31 to achieve cooling of the battery, as shown in FIG. Figure 4 As shown, the cooling groove 22 is separated from the exhaust groove 21 and is not connected to each other to prevent coolant or other fluid from entering the exhaust channel 32 so that the gas cannot be discharged smoothly. The cooling groove 22 is located adjacent to the exhaust groove 21, so that the cooling channel 31 can cool the gas in the exhaust channel 32 to a certain extent.

[0050] Among them, it should be noted that the depths of the cooling groove 22 and the exhaust groove 21 can be set to be the same or different, and can be flexibly set according to actual conditions and needs. For example, the depth of the exhaust groove 21 can be set greater than the depth of the cooling groove 22, so that more gas can flow in the exhaust channel 32, which is convenient for gas discharge and improves exhaust efficiency. Alternatively, the depth of the exhaust groove 21 can be set less than the depth of the cooling groove 22 to enhance the cooling effect. Alternatively, the depth of the exhaust groove 21 can be set to be the same as the depth of the cooling groove 22 to facilitate manufacturing while ensuring exhaust and cooling effects.

[0051] In some embodiments, the exhaust groove 21 and the cooling groove 22 are integrally stamped and formed on the flow channel plate 2 .

[0052] That is to say, the exhaust groove 21 and the cooling groove 22 are manufactured in an integrated manner, thereby improving production efficiency and reducing manufacturing costs, while also ensuring the overall structural strength of the flow channel plate 2 and effectively protecting the battery cell 5 .

[0053] In some embodiments, the cooling groove 22 includes multiple sub-groove segments, that is, the cooling groove 22 includes two, three, four or even more sub-groove segments, and the multiple sub-groove segments are distributed side by side and connected in series in sequence, that is, the multiple sub-groove segments are connected to form a continuous cooling channel 31, so that the coolant can flow from one sub-groove segment to the next sub-groove segment, thereby flowing along the entire cooling channel 31 to achieve effective heat exchange.

[0054] Among them, setting up multiple sub-slot sections can increase the flow path of the coolant and improve the turbulence effect on the coolant, thereby improving the heat exchange efficiency and uniformly and effectively cooling the battery.

[0055] Furthermore, the exhaust groove 21 is located between two adjacent sub-groove sections, thereby ensuring the existence of the exhaust channel 32 without affecting the flow of the coolant, thereby achieving smooth discharge of the gas ejected from the explosion-proof valve 4 and effective cooling of the battery.

[0056] Specifically, Figure 3 and Figure 4 As shown, the cooling groove 22 includes a plurality of sub-groove segments, and the plurality of sub-groove segments are arranged along Figure 4 The exhaust grooves 21 are arranged side by side in the left-right direction and connected in series in sequence, and the exhaust groove 21 is located between two adjacent sub-groove sections.

[0057] In some embodiments, Figure 3 As shown, the flow channel plate 2 is provided with an exhaust hole 23 connected to the exhaust groove 21. The exhaust hole 23 can be set at the end of the exhaust groove 21, and can also be set at the middle or other positions of the exhaust groove 21. Therefore, when the explosion-proof valve 4 at the bottom of the battery cell 5 is opened, the generated gas can be orderly transported to the exhaust hole 23 along the exhaust groove 21 and discharged from the exhaust hole 23, so that the gas is smoothly discharged to the outside, and the exhaust from the bottom of the battery cell 5 can prevent the high-temperature gas from spraying to the end cover plates of other adjacent battery cells 5, thereby reducing the safety risk.

[0058] In actual design, the exhaust hole 23 can be connected to other air channels in the tray, or directly connected to the exhaust valve of the entire battery pack, so that the high-temperature gas generated by the opening of the explosion-proof valve 4 can be discharged to other air channels or directly discharged to the outside through the exhaust valve of the battery pack.

[0059] In some embodiments, the exhaust hole 23 is located at one end of the exhaust groove 21 .

[0060] Specifically, Figure 3 As shown, the exhaust groove 21 is arranged along the length direction of the battery cell 5, and the length dimension of the exhaust groove 21 can be set as large as possible, so that the length of the exhaust channel 32 is longer, so that more gas can flow in the exhaust channel 32, and the gas generated quickly when the explosion-proof valve 4 is opened can be buffered to a certain extent, and then the gas can flow smoothly along the exhaust groove 21 until it flows to the exhaust hole 23 at the end, and finally discharged from the exhaust hole 23.

[0061] Therefore, by setting the exhaust hole 23 at one end of the exhaust groove 21, it is helpful to buffer the gas generated by the rapid opening of the explosion-proof valve 4, and prevent the gas from accumulating and failing to be discharged in time, thereby causing safety problems.

[0062] In actual design, the number of exhaust holes 23 can be set to one, two or more. The exhaust holes 23 can be set at both ends of the exhaust groove 21 in the length direction, or the exhaust holes 23 can be set in the middle of the exhaust groove 21, or the exhaust holes 23 can be set in the middle and both ends of the exhaust groove 21 to increase the exhaust efficiency. It can be flexibly set according to actual conditions and is not limited to what is described in this embodiment.

[0063] In some embodiments, the temperature plate 1 has a plurality of battery support areas 12, and the plurality of battery support areas 12 are suitable for supporting the plurality of battery cells 5 in a one-to-one correspondence. In other words, the battery support area 12 is mainly used to support the battery cells 5, and the plurality of battery support areas 12 are provided to support the plurality of battery cells 5, thereby ensuring the stability and accuracy of the plurality of battery cells 5 in the module.

[0064] Specifically, Figure 3 As shown, Figure 3 Taking a dual-module battery as an example, the temperature homogenizing plate 1 has two battery supporting areas 12, and the two battery supporting areas 12 can be supported on the bottom of the two groups of battery cells 5 in a one-to-one correspondence to ensure that the two groups of battery cells 5 can be stably supported.

[0065] Furthermore, each battery supporting area 12 is correspondingly formed with a cooling channel 31 and an exhaust channel 32 .

[0066] That is to say, the cooling channel 31 of each battery support area 12 can circulate coolant to cool the battery cells 5 in the battery support area 12, take away the heat generated by the battery cells 5, thereby lowering the temperature of the battery cells 5, and the exhaust channel 32 of each battery support area 12 can circulate the gas ejected by the explosion-proof valve 4 and discharge the gas.

[0067] Therefore, by setting corresponding cooling channels 31 and exhaust channels 32 in each battery supporting area 12 to cool each battery cell 5 and exhaust gas, uniform cooling and exhaust of the battery module is achieved, preventing gas from accumulating in the battery cell 5 and affecting the normal operation of the battery module, thereby effectively extending the service life of the battery module.

[0068] Specifically, Figure 3 and Figure 4 As shown, the two battery support areas 12 are respectively formed with cooling channels 31 and exhaust channels 32, and the exhaust channels 32 are located in the middle of the battery support area 12, so as to facilitate communication with the explosion-proof valve 4 at the middle position of the bottom of the battery cell 5. Figure 4 As shown, the bottom of the battery cell 5 is fitted and connected to the upper surface of the temperature equalizing plate 1, and the explosion-proof valve 4 is spaced a certain distance from the inner bottom wall of the exhaust channel 32, so that the gas discharged when the explosion-proof valve 4 is opened can be buffered.

[0069] In actual design, flame retardant materials or heat-absorbing materials can also be set in the exhaust channel 32 to reduce the gas temperature and prevent the gas temperature from being too high and causing combustion. For example, since the gas production volume and gas pressure of LFP are not large due to uncontrolled gas production, there is no large high-temperature airflow impact, and there is no need to consider the anti-airflow impact design. The NCM gas production reaction is violent and the gas temperature is higher, then a heat-absorbing material can be set in the exhaust groove 21, and materials such as hydrogel can be used to resist gas impact while cooling the gas.

[0070] In some embodiments, the exhaust channels 32 corresponding to two adjacent battery supporting areas 12 are distributed at intervals.

[0071] Specifically, since the temperature of the gas generated after the explosion-proof valve 4 is opened is relatively high, in order to prevent local overheating and improve the heat dissipation efficiency, the exhaust channels 32 corresponding to two adjacent battery support areas 12 are spaced apart so that the exhaust channels 32 corresponding to each battery support area 12 can exhaust and dissipate heat without affecting each other, thereby avoiding heat accumulation that cannot be discharged in time, causing the battery temperature to continue to rise, and causing safety hazards.

[0072] Therefore, by distributing the exhaust channels 32 corresponding to two adjacent battery support areas 12 at intervals, the heat dissipation efficiency can be improved, the operating temperature of the battery module can be effectively reduced, and the service life of the battery module can be extended.

[0073] In other embodiments, Figure 3 As shown, the cooling channels 31 corresponding to two adjacent battery supporting areas 12 are connected.

[0074] That is to say, the cooling channels 31 corresponding to each battery supporting area 12 are interconnected to form an integral cooling channel 31, so that the cooling liquid can flow evenly through various parts of the battery module, thereby improving the heat dissipation efficiency, reducing the temperature difference inside the battery module, and further improving the overall performance and safety of the battery module.

[0075] In some embodiments, a separation gap 13 is formed between two adjacent battery supporting regions 12 , and the two adjacent battery supporting regions 12 are connected at ends of the separation gap 13 .

[0076] Specifically, Figure 3 As shown, the temperature plate 1 is provided with two battery support areas 12, and a separation gap 13 is formed between the two battery support areas 12. A gap matching the separation gap 13 is also provided on the flow channel plate 2. The separation gap 13 is used to avoid the tray structure to prevent the battery guard plate 100 from interfering with the tray structure. Among them, two adjacent battery support areas 12 are connected at the ends of the separation gap 13 to ensure the stability and integrity of the structure of the overall temperature plate 1, and enhance the overall stability and impact resistance of the battery module.

[0077] The invention also provides a battery pack.

[0078] A battery pack according to an embodiment of the present invention comprises a battery cell 5 and a battery guard plate 100 of any one of the above-mentioned embodiments. The battery guard plate 100 is provided at the top and / or bottom of the battery cell 5. The battery guard plate 100 can be provided separately at the top or bottom of the battery cell 5, that is, a single-layer battery guard plate 100. The battery guard plate 100 can also be provided at both the top and bottom of the battery cell 5, that is, a double-layer battery guard plate 100. The battery cell 5 is provided with an explosion-proof valve 4 directly opposite to the exhaust port 11.

[0079] Specifically, Figure 4 As shown, the battery cell 5 is installed above the temperature equalizing plate 1, that is, a battery guard plate 100 is provided at the bottom of the battery cell 5, and the bottom of the battery cell 5 is connected to the upper surface of the temperature equalizing plate 1 by welding to ensure that the connection between the battery cell 5 and the temperature equalizing plate 1 is reliable and prevent the temperature equalizing plate 1 from being separated from the bottom of the battery cell 5, wherein an explosion-proof valve 4 is provided at the bottom of the battery cell 5 opposite to the exhaust port 11, and the explosion-proof valve 4 is arranged at the middle position of the bottom of the battery cell 5, so that after the explosion-proof valve 4 is opened, the gas inside the battery cell 5 can be discharged to the exhaust channel 32 through the explosion-proof valve 4 in time, and then discharged to the outside through the exhaust hole 23.

[0080] Exhausting the gas at the bottom of the battery cell 5 can also prevent the exhausted high-temperature gas from being sprayed onto the end covers of other adjacent battery cells 5, thereby reducing safety risks and improving the overall safety of the battery pack.

[0081] It should be noted that the number of explosion-proof valves 4 can be flexibly set according to actual needs. For example, the number of explosion-proof valves 4 can be one, two, three or more. Setting multiple explosion-proof valves 4 can allow more gas to be quickly discharged from the battery cell 5, thereby improving exhaust efficiency.

[0082] In some embodiments, the cooling channels 31 and the exhaust channels 32 are spaced apart and distributed in a first direction, wherein the first direction is a length direction of the battery cell 5 .

[0083] Specifically, Figure 3 As shown, Figure 3 The first direction shown in the figure is the length direction of the battery cell 5, and the cooling channel 31 and the exhaust channel 32 are spaced apart and distributed in the length direction of the battery cell 5. Therefore, the length of the cooling channel 31 and the length of the exhaust channel 32 can be effectively increased, thereby effectively improving the cooling efficiency and the exhaust effect, improving the heat dissipation uniformity of the battery pack, and avoiding interference between the exhaust channel 32 and the cooling channel 31.

[0084] In actual design, the length of the battery cell can be 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, etc., which can be selected according to actual needs.

[0085] In some embodiments, the length of the battery cell 5 in the first direction is L, and along the first direction, the distance between the cooling channel 31 on both sides of the exhaust channel 32 is b, and satisfies: b≤L / x, where x is determined according to the specifications of the battery cell 5 and is affected by the model of the battery cell 5, the heat generation power, and the charging rate. For example, when the battery guard plate 100 in the battery pack is set at the top or bottom of the battery cell 5, that is, only one battery guard plate 100 is set, the ratio of b to L is x1, and when the battery guard plate 100 is set at the top or bottom of the battery cell 5 at the same time, that is, two battery guard plates 100 are set, the ratio of b to L is x2.

[0086] Specifically, since the heat generation in the middle of the battery cell 5 is relatively low during daily use, that is, the middle of the battery cell 5 generates less heat and has a lower temperature, and the battery pack with higher requirements for cooling performance is also provided with two battery guard plates 100, that is, the battery guard plates 100 are provided at the top or bottom of the battery cell 5 at the same time, therefore, the exhaust flow channel provided in the present invention does not affect the performance of the battery cell 5.

[0087] And by setting the above parameters, it can be further ensured that the setting of the exhaust channel 32 will not affect the performance of the battery cell 5, thereby ensuring the normal operation of the battery pack.

[0088] In some embodiments, Figure 5 As shown, the width of the exhaust channel 32 in the first direction is d, and the spacing between the exhaust channel 32 and the cooling channel 31 is c. The spacing c setting can effectively ensure the reliable connection between the temperature equalizing plate 1 and the flow channel plate 2. The battery cell 5 is provided with n explosion-proof valves 4 in the first direction, that is, n can be 1, 2, 3, etc., so that the explosion-proof valves 4 can be set to one, two, three, etc., and the spacing between two adjacent explosion-proof valves 4 is e, that is, the explosion-proof valves 4 are evenly spaced apart, and the spacing between the outermost two explosion-proof valves 4 and the two side edges of the exhaust channel 32 are f1 and f2 respectively. The setting of f1 and f2 effectively ensures the normal operation of the explosion-proof valve 4, prevents the explosion-proof valve 4 from interfering with the two side edges of the exhaust channel 32, and causes wear to the explosion-proof valve 4.

[0089] Among them, b=d+c*2, d=na+ne-e+f1+f2, b=na+ne-e+f1+f2+2c, satisfying: c≥5mm, f1+f2≥0.1a, e≥15mm, 19.5mm≤a≤20.5mm.

[0090] Specifically, the spacing c between the exhaust channel 32 and the cooling channel 31 can be set to 5mm, 5.5mm, 6mm, 6.5mm, 7mm or other values. By setting c to be greater than or equal to 5mm, the welding strength between the temperature averaging plate 1 and the flow channel plate 2 can be effectively guaranteed, and the connection reliability and stability between the temperature averaging plate 1 and the flow channel plate 2 can be improved, thereby effectively improving the structural strength of the battery guard plate 100.

[0091] The spacing e between two adjacent explosion-proof valves 4 can be set to 15mm, 15.5mm, 16mm, 16.5mm, 17mm or other values. By setting e to be greater than or equal to 15mm, it can be effectively ensured that the explosion-proof valves 4 work without affecting each other.

[0092] By setting f1+f2 to be greater than or equal to 0.1a as an assembly gap, it is effectively ensured that the explosion-proof valve 4 and the exhaust passage 32 do not interfere with each other, and that the gas ejected from the explosion-proof valve 4 can smoothly enter the exhaust passage 32, thereby achieving smooth exhaust.

[0093] The width a of the explosion-proof valve 4 can be set to 19.5 mm, 20 mm, 20.5 mm or other values, and can be flexibly set according to actual conditions.

[0094] like Figure 5 As shown, b=d+c*2, d=na+ne-e+f1+f2, b=na+ne-e+f1+f2+2c. When an explosion-proof valve 4 is set, that is, n is 1, b and d take the smallest values.

[0095] Therefore, by setting the above parameters, the exhaust channel 32 can be set while ensuring the overall cooling effect of the battery guard plate 100, that is, smooth exhaust and effective cooling of the battery cell 5 can be achieved at the same time, ensuring the overall safety of the battery pack.

[0096] In some embodiments, the exhaust channel 32 is extended along the second direction, and there are multiple battery cells 5, that is, two, three or even more battery cells 5 can be arranged, and the multiple battery cells 5 are arranged in sequence along the second direction. The explosion-proof valves 4 of the multiple battery cells 5 are all opposite to an exhaust port 11, and the second direction is perpendicular to the first direction.

[0097] Specifically, Figure 4 As shown, the second direction is Figure 4 In the up-down direction, the exhaust channel 32 is extended in the up-down direction, so that the gas is smoothly discharged through the exhaust channel 32. When multiple battery cells 5 are set, the multiple battery cells 5 are arranged in sequence along the up-down direction. In this way, the space of the battery module can be fully utilized to improve the energy density of the battery. Among them, the explosion-proof valves 4 of the multiple battery cells 5 are directly opposite to an exhaust port 11, so that the gas inside each battery cell 5 can be discharged into the exhaust channel 32 through the corresponding explosion-proof valve 4, and then discharged to the outside through the exhaust channel 32.

[0098] In some embodiments, Figure 5 As shown, the second direction is the thickness direction of the battery cell 5 , that is, the plurality of battery cells 5 are arranged in sequence along the thickness direction of the battery cell 5 to fully utilize the space of the battery module and improve the energy density of the battery.

[0099] The present invention also provides a vehicle, comprising a battery pack according to any one of the above embodiments.

[0100] Among them, by setting an exhaust port 11 for avoiding the explosion-proof valve 4 and an exhaust channel 32 connected to the exhaust port 11, the interference between the explosion-proof valve 4 and the battery guard plate 100 is avoided, and the gas ejected after the explosion-proof valve 4 is opened is smoothly discharged. At the same time, a cooling flow channel 31 separated from the exhaust channel 32 is set, which can cool down the battery and the ejected high-temperature gas, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

[0101] The following is a battery cell 5 with L=580mm. Based on the heat generation data under 1.5C fast charging conditions, x1=6, x2=3 are obtained; thus, the value of b is: (c=5, n=1) 1.1a+10≤b≤L / 6 (single-layer battery guard plate 100) or (c=5, n=1) 1.1a+10≤b≤L / 3 (double-layer battery guard plate 100). The simulation results are shown in Tables 1 and 2 below:

[0102] No impact on performance means: compared with the fully cooled working condition (i.e. b=0), when b takes a value within this range, the difference between the temperature difference △T of the battery cell 5 and the temperature difference △T_0 when b=0 is △T1=(△T-△T_0)≤1°C, and the difference between the maximum temperature TMAX of the battery cell 5 and the maximum temperature TMAX_0 when b=0 is △T2=(TMAX-TMAX_0)≤2°C.

[0103]

[0104]

[0105] Table 1

[0106]

[0107]

[0108] Table 2

[0109] It can be concluded from the above table that, compared with the fully cooled working condition (i.e., b=0), when b is set within the range of b≤L / x, the temperature difference between the battery cells 5 of the single-layer battery guard plate 100 and the double-layer battery guard plate 100 is less than or equal to 1°C, and the maximum temperature difference between the battery cells 5 of the single-layer battery guard plate 100 and the battery cells 5 of the double-layer battery guard plate 100 is less than or equal to 2°C. This verifies that the setting of the exhaust channel 32 does not affect the performance of the battery cells 5, ensures the overall cooling effect of the battery pack and achieves exhaust.

[0110] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0111] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery guard plate, characterized in that: include: A temperature-averaging plate (1), wherein the temperature-averaging plate (1) is provided with an exhaust port (11) for avoiding the explosion-proof valve (4); A flow channel plate (2), the flow channel plate (2) being connected to the temperature equalizing plate (1) and jointly defining a cooling flow channel (31) and an exhaust channel (32) which are spaced apart from each other, the exhaust channel (32) being in communication with the exhaust port (11).

2. The battery guard plate according to claim 1, characterized in that: An exhaust groove (21) is formed on one side of the flow channel plate (2) facing the temperature balancing plate (1), and the temperature balancing plate (1) and the flow channel plate (2) define the exhaust channel (32) at the exhaust groove (21); And / or, a cooling groove (22) is formed on a side of the flow channel plate (2) facing the temperature balancing plate (1), and the temperature balancing plate (1) and the flow channel plate (2) define the cooling flow channel (31) at the cooling groove (22).

3. The battery protection plate according to claim 2, characterized in that: The exhaust groove (21) and the cooling groove (22) are integrally stamped and formed on the flow channel plate (2).

4. The battery protection plate according to claim 2, characterized in that: The cooling groove (22) comprises a plurality of sub-groove segments, the plurality of sub-groove segments are arranged side by side and connected in series in sequence, and the exhaust groove (21) is located between two adjacent sub-groove segments.

5. The battery protection plate according to claim 2, characterized in that: The flow channel plate (2) is provided with an exhaust hole (23) which is in communication with the exhaust groove (21).

6. The battery protection plate according to claim 5, characterized in that: The exhaust hole (23) is located at one end of the exhaust groove (21).

7. The battery shield according to any one of claims 1 to 6, characterized in that: The temperature homogenizing plate (1) has a plurality of battery supporting areas (12), and the plurality of battery supporting areas (12) are suitable for supporting a plurality of groups of battery cells (5) in a one-to-one correspondence; Wherein, each of the battery supporting areas (12) is correspondingly formed with the cooling channel (31) and the exhaust channel (32).

8. The battery protection plate according to claim 7, characterized in that: The exhaust channels (32) corresponding to two adjacent battery support areas (12) are distributed at intervals; And / or, the cooling channels (31) corresponding to two adjacent battery support areas (12) are connected.

9. The battery protection plate according to claim 7, characterized in that: A separation gap (13) is formed between two adjacent battery support areas (12), and the two adjacent battery support areas are connected at the ends of the separation gap (13).

10. A battery pack, characterized in that: It comprises a battery cell (5) and a battery guard plate according to any one of claims 1 to 9, wherein the battery guard plate is provided on the top and / or bottom of the battery cell (5), and the battery cell (5) is provided with an explosion-proof valve (4) directly facing the exhaust port (11).

11. The battery pack according to claim 10, characterized in that: The cooling flow channel (31) and the exhaust channel (32) are spaced apart and distributed in a first direction; Wherein, the first direction is the length direction of the battery core (5).

12. The battery pack according to claim 11, characterized in that: The length of the battery cell (5) in the first direction is L, and along the first direction, the distance between the cooling channels (31) located on both sides of the exhaust channel (32) is b, and satisfies: b≤L / x, where x is determined according to the specifications of the battery cell (5).

13. The battery pack according to claim 12, characterized in that: The width of the exhaust channel (32) in the first direction is d, the spacing between the exhaust channel (32) and the cooling channel (31) is c, the battery cell (5) is provided with n explosion-proof valves (4) in the first direction, the spacing between two adjacent explosion-proof valves (4) is e, wherein the spacing between the two outermost explosion-proof valves (4) and the two side edges of the exhaust channel (32) are f1 and f2 respectively, and the width of the explosion-proof valve (4) is a; Among them, b=d+c*2, d=na+ne-e+f1+f2, b=na+ne-e+f1+f2+2c, satisfying: c≥5mm, f1+f2≥0.1a, e≥15mm.

14. The battery pack according to claim 11, characterized in that: The exhaust channel (32) is extended along the second direction; There are a plurality of battery cells (5), and the plurality of battery cells (5) are arranged in sequence along the second direction; the explosion-proof valves (4) of the plurality of battery cells (5) are all directly opposite to one of the exhaust ports (11); and the second direction is perpendicular to the first direction.

15. The battery pack according to claim 14, characterized in that: The second direction is the thickness direction of the battery core (5).

16. A vehicle, characterized in that: A battery pack comprising any one of claims 1-15.

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