Battery pack and vehicle

Abstract

The utility model relates to a battery pack and a vehicle, the battery pack comprises a plurality of battery pack units, each battery pack unit comprises a pressure relief component arranged in the horizontal direction and two battery units symmetrically arranged about the pressure relief component, and the length direction of the battery units is consistent with the length direction of the pressure relief component. Each battery unit comprises a plurality of single batteries, the anti-explosion valves of the single batteries in the same battery unit face the same direction, the sides, where the anti-explosion valves are located, of the two battery units in the same battery pack unit are oppositely arranged, and pressure relief channels are formed in the two sides, in the length direction of the pressure relief component, of the pressure relief component in a penetrating mode; and the pressure relief channels on the two sides of the pressure relief component are respectively opposite to and communicated with the anti-explosion valves of the two adjacent battery units. Through cooperation of the pressure relief component and the pressure relief channel, heat and other products generated during thermal runaway of the battery monomers can be timely discharged to the outside of the battery pack, so that the safety performance of the battery pack is improved.

Description

Technical Field

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

[0002] As the scale of electric vehicles gradually grows, the types and scale of batteries used are also increasing. At present, electric vehicles generally use lithium battery packs as power sources, and the battery packs are generally installed on the chassis of the car and located under the seat. Therefore, the safety performance of the battery pack is crucial to the development of electric vehicles.

[0003] In the related art, the battery pack is installed vertically on the chassis of the car, so that the battery's electrode poles and explosion-proof valves face upward and directly face the passengers in the vehicle. When the battery thermally runs away, high-temperature and high-pressure gas or flames will rush directly toward the passengers, seriously endangering their personal safety. Although there are also battery packs with electrode poles and explosion-proof valves facing sideways in the related art, the energy of the battery cells inside the battery pack is difficult to be discharged in time when thermal runaway occurs, causing the battery pack as a whole to thermally run away, resulting in poor safety performance of the battery pack. Utility Model Content

[0004] Based on this, it is necessary to provide a battery pack and a vehicle to address the problem in the related art that the safety performance of the battery pack is low due to the difficulty in timely dissipation of heat during thermal runaway of the battery cells.

[0005] In a first aspect, the present application provides a battery pack comprising a plurality of battery pack units, each of which comprises a pressure relief member arranged in a horizontal direction and two battery units symmetrically arranged about the pressure relief member, the length direction of the battery unit is consistent with the length direction of the pressure relief member, the battery unit comprises a plurality of battery cells, and the battery cells comprise explosion-proof valves; the explosion-proof valves of the battery cells in the same battery unit are oriented in the same direction, the pressure relief member is penetrated by pressure relief channels on both sides along its length direction, and the pressure relief channels on both sides of the pressure relief member are respectively opposite to and connected to the explosion-proof valves of the two adjacent battery cells.

[0006] In one embodiment, the battery unit includes a plurality of battery cells stacked along the length direction and / or the height direction of the pressure relief member.

[0007] In one of the embodiments, the battery unit includes at least two battery cells stacked along the height direction of the pressure relief member;

[0008] The pressure relief passage includes at least two first pressure relief passages and a second pressure relief passage, and the first pressure relief passage corresponds to the explosion-proof valves of the battery cells stacked in the height direction of the pressure relief member.

[0009] In one of the embodiments, the second pressure relief channel is disposed between the two first pressure relief channels, and the second pressure relief channel and the explosion-proof valve are disposed in a staggered manner in the height direction of the pressure relief component.

[0010] In one embodiment, the first pressure relief channel is a concave arc surface curved toward one side of the pressure relief component, a convex arc surface curved away from one side of the pressure relief component, or an inclined surface inclined toward the center of the pressure relief component;

[0011] The second pressure relief passage is a concave arc surface curved toward one side of the pressure relief component, a convex arc surface curved away from the side of the pressure relief component, or an inclined surface inclined toward the center of the pressure relief component;

[0012] The innermost side of the second pressure relief channel is closer to the central symmetry plane of the pressure relief component than the innermost side of the first pressure relief channel.

[0013] In one embodiment, the battery pack also includes a box body for accommodating battery cells, the box body includes an upper box cover and a lower box body that are snap-fitted and sealed to each other, the plane where the explosion-proof valve is located is perpendicular to the plane where the outer surface of the upper box cover is located and / or the largest surface of the battery cell is parallel to the plane where the outer surface of the upper box cover is located.

[0014] In one of the embodiments, the pressure relief component is fixed in the box body by a limiter, and the box body is provided with a pressure relief valve connected to the pressure relief channel.

[0015] In one embodiment, a plurality of mounting grooves are provided on the bottom wall of the pressure relief member, and the position limiting member includes a plurality of protruding columns provided on the bottom wall of the lower box body, and the protruding columns are plugged into and matched with the mounting grooves one by one;

[0016] Alternatively, a support beam is further provided on the inner bottom wall of the lower box body, the length direction of the support beam is consistent with the extension direction of the pressure relief channel, and a plurality of protruding columns are arranged on the support beam along the length direction of the support beam.

[0017] In one embodiment, a receiving groove is provided on the inner top wall of the upper box cover, and the top of the pressure relief member is engaged with the receiving groove;

[0018] Alternatively, a U-shaped limiter is provided on the inner top wall of the upper box cover, the U-shaped limiter is connected to the inner top wall of the upper box cover, and the top of the pressure relief component is engaged with the accommodating groove.

[0019] In a second aspect, the present application further provides a vehicle, comprising any one of the battery packs provided in the first aspect, wherein the plane where the explosion-proof valve is located is perpendicular to the maximum outer surface of the vehicle chassis.

[0020] The above-mentioned battery pack includes multiple battery pack units, each battery pack unit includes a pressure relief component arranged in a horizontal direction and two battery units symmetrically arranged about the pressure relief component, the length direction of the battery unit is consistent with the length direction of the pressure relief component, the battery unit includes multiple battery cells, and the battery cell includes an explosion-proof valve; the explosion-proof valves of each battery cell located in the same battery unit are in the same direction, and the pressure relief component is penetrated by pressure relief channels on both sides along its own length direction, and the pressure relief channels on both sides of the pressure relief component are respectively opposite to and connected to the explosion-proof valves of the two adjacent battery cells. In the present application, when a battery cell suffers from a relatively serious thermal runaway, the pressure relief channels horizontally arranged on both sides of the pressure relief component help to promptly discharge the high-temperature and high-pressure gas, burning flames and particles released after the explosion-proof valve of the battery cell ruptures to the outside of the battery pack, thereby preventing the products of these battery thermal runaways from accumulating inside the battery pack, thereby reducing the possibility of thermal runaway of the battery pack as a whole, and further improving the safety performance of the battery pack; and because each battery pack unit has a pressure relief component, to a certain extent, the pressure relief component can play a role of barrier protection. When one or a small number of battery pack units suffer from thermal runaway, the barrier effect of the pressure relief component can reduce the probability or speed of thermal runaway of the battery pack as a whole, thereby improving the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] FIG. 1 is a schematic structural diagram of the connection relationship between a battery unit and a pressure relief member in some embodiments of the present application.

[0023] FIG. 2 is a schematic structural diagram for illustrating the positional relationship among the first battery cell, the second battery cell, and the pressure relief member in some embodiments of the present application.

[0024] FIG3 is a schematic structural diagram of a first pressure relief channel and a second pressure relief channel in a pressure relief component in some embodiments of the present application.

[0025] FIG. 4 is a schematic diagram illustrating the overall structure of a battery pack in some embodiments of the present application.

[0026] FIG. 5 is a schematic structural diagram for illustrating the positional relationship between the pressure relief valve and the housing in some embodiments of the present application.

[0027] FIG6 is a schematic structural diagram for illustrating the connection relationship between the lower box, the support beam and the raised column in some embodiments of the present application.

[0028] FIG. 7 is a schematic structural diagram for illustrating the connection relationship between the upper box cover, the pressure relief member, the lower box body and the battery unit in some embodiments of the present application.

[0029] FIG8 is a schematic cross-sectional structure diagram for illustrating the internal structure of a battery cell in some embodiments of the present application.

[0030] FIG. 9 is a schematic cross-sectional structure diagram for illustrating the internal structure of a battery cell in other embodiments of the present application.

[0031] FIG. 10 is a schematic structural diagram for illustrating the positional relationship between a vehicle and a battery pack of the present application in some embodiments of the present application.

[0032] Description of Figure Numbers:

[0033] 100, battery pack unit; 110, pressure relief component; 112, pressure relief channel; 1120, first pressure relief channel; 1122, second pressure relief channel; 1124, concave arc surface; 1126, inclined surface; 114, mounting groove; 120, battery unit; 122, first battery unit; 124, second battery unit; 130, battery cell; 132, explosion-proof valve; 134, positive electrode sheet; 136, negative electrode sheet; 138, insulating diaphragm; 140, end plate; 150, fastener; 200, box body; 210, upper box cover; 212, receiving groove; 220, lower box body; 230, pressure relief valve; 240, raised column; 250, support beam. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0035] In the description of the present application, 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0040] As the scale of electric vehicles gradually grows, the types and scale of batteries used are also increasing. At present, electric vehicles generally use lithium battery packs as power sources, and the battery packs are generally installed on the chassis of the car and located under the seat. Therefore, the safety performance of the battery pack is crucial to the development of electric vehicles.

[0041] In the related art, the battery pack is installed vertically on the chassis of the car, so that the battery's electrode poles and explosion-proof valves face upward and directly face the passengers in the vehicle. When the battery thermally runs away, high-temperature and high-pressure gas or flames will rush directly toward the passengers, seriously endangering their personal safety. Although there are also battery packs with electrode poles and explosion-proof valves facing sideways in the related art, the heat or energy of the battery cells inside the battery pack when thermal runaway occurs is difficult to be discharged in time, making the battery pack as a whole prone to thermal runaway, resulting in poor safety performance of the battery pack.

[0042] In order to solve the problems in the related art, in the first aspect, with reference to FIG1 and FIG2, the inventor of the present application has designed a battery pack. The battery pack provided by an embodiment of the present application includes a plurality of battery pack units 100, each of which includes a pressure relief member 110 arranged in a horizontal direction and two battery units 120 symmetrically arranged about the pressure relief member 110, the length direction of the battery unit 120 is consistent with the length direction of the pressure relief member 110, the battery unit 120 includes a plurality of battery cells 130, the battery cells 130 include explosion-proof valves 132, the explosion-proof valves 132 of each battery cell 130 in the same battery cell 120 are oriented in the same direction, the explosion-proof valves 132 of the two battery cells 120 in the same battery pack unit 100 are arranged opposite to each other, and the pressure relief member 110 is penetrated by pressure relief channels 112 on both sides along its length direction, and the pressure relief channels 112 on both sides of the pressure relief member 110 are respectively opposite to and connected to the explosion-proof valves 132 of the two adjacent battery cells 120.

[0043] Specifically, the two battery cells 120 symmetrically arranged about the pressure relief member 110 are respectively the first battery cell 122 and the second battery cell 124. The first battery cell 122 and the second battery cell 124 may each include a plurality of battery cells 130, and each battery cell 130 includes at least one battery cell 130. The battery cell 130 is located on one side of the explosion-proof valve 132 in its own length direction, and the battery cell 130 is adjacent to the explosion-proof valve 132 in its own width direction. The length direction of the battery cell 120 and the pressure relief member 110 is consistent with the length direction of the battery cell 130, and the horizontal array direction of the battery cell 120 and the pressure relief member 110 is consistent with the width direction of the battery cell 130. End plates 140 are bonded to both ends of each battery cell 120, and the plurality of battery cells 130 and the end plates 140 are combined by fasteners 150 to form the battery cell 120. The fasteners 150 may be a polyethylene strapping tape or a steel tape.

[0044] As shown in FIG. 2 , each battery unit 120 includes a plurality of battery cells 130 stacked along a length direction and / or a height direction of the pressure relief member 110 .

[0045] Specifically, each battery cell 120 in the present embodiment includes six groups of battery cells 130 arrayed along the length direction of the pressure relief member 110, and each group of battery cells 130 includes two battery cells 130 stacked up and down along the height direction of the pressure relief member 110. The explosion-proof valves 132 of each battery cell 130 located in the same battery cell 120 are oriented in the same direction, and the side where the explosion-proof valve 132 of the first battery cell 122 located in the same battery pack unit 100 is arranged opposite to the side where the explosion-proof valve 132 of the second battery cell 124 is located, the pressure relief channel 112 on one side of the pressure relief member 110 is opposite to and connected to the explosion-proof valve 132 of the first battery cell 122 in the battery pack unit 100 to which it belongs, and the pressure relief channel 112 on the other side of the pressure relief member 110 is opposite to and connected to the explosion-proof valve 132 of the second battery cell 124 in the battery pack unit 100 to which it belongs.

[0046] In this embodiment, when a battery cell 130 has a relatively serious thermal runaway, the pressure relief channels 112 horizontally penetrating through the two sides of the pressure relief component 110 can help to promptly discharge the high-temperature and high-pressure gas, burning flames and particles released after the explosion-proof valve 132 of the battery cell 130 ruptures to the outside of the battery pack, thereby preventing the products of these battery thermal runaways from accumulating inside the battery pack, thereby reducing the possibility of thermal runaway of the battery pack as a whole, and further improving the safety performance of the battery pack; and because each battery pack unit 100 has a pressure relief component 110, to a certain extent, the pressure relief component 110 can play a role of barrier protection. When one or a small number of battery pack units 100 have a thermal runaway, the probability or speed of thermal runaway of the battery pack as a whole can be reduced under the barrier effect of the pressure relief component 110, thereby improving the safety performance of the battery pack.

[0047] 2 and 3 , the pressure relief channel 112 includes at least two first pressure relief channels 1120 and a second pressure relief channel 1122. The number of the first pressure relief channels 1120 corresponds to the number of battery cells 130 stacked along the height direction of the pressure relief member 110, and the first pressure relief channels 1120 correspond to the explosion-proof valves 132 of the battery cells 130 stacked along the height direction of the pressure relief member 110; the second pressure relief channel 1122 is disposed between the two first pressure relief channels 1120, and the second pressure relief channel 1122 and the explosion-proof valve 132 are staggered in the height direction of the pressure relief member 110.

[0048] In the present embodiment, the first pressure relief channel 1120 is a concave arc surface 1124 bent toward one side of the pressure relief member 110, or a convex arc surface bent away from the side of the pressure relief member 110, or an inclined surface 1126 inclined toward the center of the pressure relief member 110, and the second pressure relief channel 1122 is a concave arc surface 1124 bent toward one side of the pressure relief member 110, or a convex arc surface bent away from the side of the pressure relief member 110, or an inclined surface 1126 inclined toward the center of the pressure relief member 110; as shown in Figure 7, no matter what style of structure the first pressure relief channel 1120 and the second pressure relief channel 1122 adopt, the innermost side of the second pressure relief channel 1122 is closer to the central symmetry plane of the pressure relief member 110 than the innermost side of the first pressure relief channel 1120.

[0049] Specifically, the extension direction of the first pressure relief channel 1120 and the second pressure relief channel 1122 are consistent with the length direction of the battery unit 120, and the two pressure relief channels 112 both penetrate the end wall of the pressure relief member 110, so as to discharge the heat or energy in the battery pack out of the battery pack in time when the battery unit 130 has thermal runaway. The first pressure relief channel 1120 can be a concave arc surface 1124 bent toward one side of the pressure relief member 110, or a slope 1126 inclined toward the center of the pressure relief member 110. Similarly, the second pressure relief channel 1122 can be a concave arc surface 1124 bent toward one side of the pressure relief member 110, or a slope 1126 inclined toward the center of the pressure relief member 110. In addition, the two pressure relief channels 112 may also be arranged with concave arc surfaces 1124 and inclined surfaces 1126 alternately arranged, and even the number of concave arc surfaces 1124 and inclined surfaces 1126 on the two pressure relief channels 112 may be arbitrarily set. For the sake of simplicity, the present application only provides two structural schematic diagrams of the pressure relief channels 112 as shown in the figures and the figures. The remaining pressure relief channel 112 setting schemes that are not recorded in this embodiment and are any combination of concave arc surfaces 1124 and inclined surfaces 1126 should also be considered as the technical solution content included in the present application.

[0050] In this embodiment, the arrangement of the concave arc surface 1124 and the inclined surface 1126 helps to guide the high-temperature and high-pressure gas, burning flames, particles and other products released after the explosion-proof valve 132 of the battery cell 130 is ruptured, so that the products of these battery thermal runaways can be discharged to the outside of the battery pack in time, thereby reducing the probability or speed of thermal runaway of the battery pack as a whole, thereby improving the safety performance of the battery pack. Since the innermost side of the second pressure relief channel 1122 is closer to the central symmetric plane of the pressure relief member 110 than the innermost side of the first pressure relief channel 1120, the high-temperature and high-pressure gas, burning flames, particles and other products released after the explosion-proof valve 132 is ruptured can flow to the second pressure relief channel 1122 through the first pressure relief channel 1120 and then be discharged.

[0051] 4, 5 and 6, in some embodiments, the battery pack further includes a box body 200 for accommodating the battery cell 120, the box body 200 includes an upper box cover 210 and a lower box body 220 that are mutually buckled and sealed, the pressure relief member 110 is fixed in the box body 200 by a limiter, and the box body 200 is provided with a pressure relief valve 230 that is connected to the pressure relief channel 112. The upper box cover 210 and the lower box body 220 that are mutually buckled and sealed can be sealed by filling a sealant or providing a sealing gasket between the upper box cover 210 and the lower box body 220. The plane where the explosion-proof valve 132 is located is perpendicular to the plane where the outer surface of the upper box cover 210 is located and / or the largest surface of the battery cell 130 is parallel to the plane where the outer surface of the upper box cover 210 is located.

[0052] Specifically, the box 200 can accommodate, carry and protect the battery cells 120, and also facilitate the transfer and installation of the battery cells 120 after packaging. The pressure relief valve 230 in this embodiment is arranged on the side wall of the lower box 220, and the pressure relief valve 230 can be arranged one-to-one with the pressure relief channel 112, so that when the battery cell 130 has thermal runaway, the products such as high-temperature and high-pressure gas, burning flames and particles are discharged to the outside of the battery pack in time, thereby reducing the possibility of thermal runaway of the battery pack as a whole.

[0053] In this embodiment, the pressure relief member 110 can be first fixed in the box body 200 through the limiter so that the outlet of the pressure relief channel 112 is opposite to and connected with the pressure relief valve 230, and then the packaged battery cells 120 are placed horizontally in the lower box body 220 in sequence, and each battery cell 120 is tightly pressed against the adjacent pressure relief member 110. When the battery cell 130 has thermal runaway, the pressure relief channel 112 and the pressure relief valve 230 cooperate to timely discharge the high-temperature and high-pressure gas, burning flames and particles and other products to the outside of the battery pack; and due to the limiting and accommodating effect of the box body 200 on each battery cell 120, the high-temperature and high-pressure gas, burning flames and particles and other products rushing out of the explosion-proof valve 132 are discharged after passing through the pressure relief channel 112 and the pressure relief valve 230 in sequence, which helps to avoid direct contact with other objects when the battery cell 130 has a more serious thermal runaway, that is, the box body 200 plays a role of isolation protection to a certain extent, thereby further improving the safety performance of the battery pack.

[0054] 6 and 7 , in some embodiments, a plurality of mounting grooves 114 are provided on the bottom wall of the pressure relief member 110 , and the limiting member includes a plurality of protruding columns 240 provided on the inner bottom wall of the lower box body 220 , and the protruding columns 240 are plugged into and matched with the mounting grooves 114 one by one.

[0055] Specifically, a plurality of mounting grooves 114 are evenly distributed on the bottom wall of the pressure relief component 110 along its length direction, and the position of the pressure relief component 110 is conveniently fixed by plugging and fitting the protruding columns 240 into the mounting grooves 114 .

[0056] In this embodiment, the plug-in cooperation of a plurality of raised columns 240 and the mounting grooves 114 helps to ensure the tightness and stability of the pressure relief component 110 when pressed against the adjacent battery unit 120; and helps to alleviate the impact force of thermal runaway products such as high-temperature and high-pressure gas rushing out of the explosion-proof valve 132, thereby ensuring the stable protection of the pressure relief component 110 on the adjacent batteries.

[0057] 6 , in some embodiments, a support beam 250 is further provided on the inner bottom wall of the lower box body 220 , the length direction of the support beam 250 is consistent with the extension direction of the pressure relief channel 112 , and a plurality of protruding columns 240 are arranged on the support beam 250 along the length direction of the support beam 250 .

[0058] Specifically, the protruding column 240 can be fixedly connected to the support beam 250, or can be integrally formed with the support beam 250. The support beam 250 helps to enhance the stability of the pressure relief component 110 after being installed in the box 200, thereby ensuring that the pressure relief component 110 can resist the impact force of thermal runaway products such as high-temperature and high-pressure gas rushing out of the explosion-proof valve 132.

[0059] 7 , in some embodiments, a receiving groove 212 is provided on the inner top wall of the upper box cover 210 , and the top of the pressure relief member 110 is engaged with the receiving groove 212 .

[0060] Specifically, the receiving groove 212 and the support beam 250 are arranged in a one-to-one correspondence. When the upper box cover 210 and the lower box body 220 are buckled together, the length direction of the receiving groove 212 is consistent with the length direction of the pressure relief member 110.

[0061] In this embodiment, when installing the battery pack, the pressure relief component 110 is first inserted into the lower box body 220 by plugging and fitting the protruding column 240 into the mounting groove 114, and then the upper box cover 210 is buckled so that the accommodating groove 212 is snap-fitted with the top of the pressure relief component 110, thereby further improving the stability of the pressure relief component 110 installed in the box body 200, thereby enhancing the pressure resistance of the pressure relief component 110 when resisting thermal impact force and the smoothness of discharging the heat inside the battery pack.

[0062] 7 , in some embodiments, the receiving groove 212 is a U-shaped stopper, and the U-shaped stopper is connected to the inner top wall of the upper box cover 210 .

[0063] Specifically, the U-shaped limiter in this embodiment is a U-shaped metal part, which can be a U-shaped aluminum alloy part. The U-shaped metal part is fixed to the inner top wall of the upper box cover 210 by welding or riveting. When the upper box cover 210 is buckled on the lower box body 220, the U-shaped metal part is engaged with the top of the pressure relief component 110.

[0064] In this embodiment, the U-shaped limiting piece further limits the pressure relief component 110, thereby further improving the stability of the pressure relief component 110 after being installed in the box body 200; and the U-shaped metal part has good pressure resistance, which can further enhance the pressure resistance of the pressure relief component 110 against thermal impact.

[0065] 8 and 9 , in some embodiments, the battery cell 130 includes battery pole pieces, which include a plurality of staggered positive pole pieces 134 and negative pole pieces 136 , with an insulating separator 138 disposed between the positive pole piece 134 and the negative pole piece 136 .

[0066] Specifically, under the action of the insulating membrane 138, electrons cannot pass through the membrane, but ions can pass through the membrane, so the current can only be transmitted through the ions in the electrolyte, thereby effectively preventing direct contact between the positive electrode and the negative electrode, thereby avoiding a short circuit between the electrodes.

[0067] In this embodiment, an insulating diaphragm 138 is provided between the positive electrode sheet 134 and the negative electrode sheet 136 of the battery electrode sheet, which helps to prevent the electrodes from short-circuiting, thereby improving the safety and stability of the battery and further reducing the probability of thermal runaway inside the battery.

[0068] 8 and 9 , in some embodiments, the battery pole pieces are assembled in a winding structure or a stacked structure.

[0069] In this embodiment, the battery pole pieces are assembled in a winding structure or a stacked structure, which can effectively increase the effective electrode area of ​​the battery, thereby improving the energy density of the battery; and can increase the current channel inside the battery, thereby reducing the resistance between the electrodes, thereby improving the output power of the battery; and can provide good battery structural stability and mechanical support, thereby reducing the possibility of loosening of the electrodes, thereby helping to extend the service life of the battery.

[0070] On the other hand, referring to FIG. 10 , the present application also includes a vehicle, which includes any one of the battery packs provided above, and the plane where the explosion-proof valve 132 is located is perpendicular to the maximum outer surface of the vehicle chassis.

[0071] Specifically, referring to Figures 7 and 10, the battery pack is horizontally mounted on the chassis of the vehicle, the length direction of each battery unit 120 and the pressure relief member 110 in the battery pack is parallel to the plane where the vehicle chassis is located, the largest surface of the battery cell 130 is arranged parallel to the largest surface of the battery pack, and the plane where the explosion-proof valve 132 of the battery cell 130 is located is perpendicular to the largest outer surface where the vehicle chassis is located. When the battery pack has a relatively serious thermal runaway, the energy, flames or flaming particles released by the battery after the explosion-proof valve 132 ruptures will not directly face the passengers, but will be quickly discharged from the battery pack through the pressure relief channel 112 and the pressure relief valve 230, thereby ensuring the safety of the passengers in the vehicle.

[0072] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. 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 application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0073] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery pack, characterized in that: The invention comprises a plurality of battery pack units, each of which comprises a pressure relief member arranged in a horizontal direction and two battery units arranged symmetrically about the pressure relief member, the length direction of the battery unit is consistent with the length direction of the pressure relief member, the battery unit comprises a plurality of battery cells, and the battery cells comprise explosion-proof valves; The explosion-proof valves of the battery cells in the same battery unit are oriented in the same direction, and pressure relief channels are provided on both sides of the pressure relief component along its length direction. The pressure relief channels on both sides of the pressure relief component are respectively opposite to and connected with the explosion-proof valves of the two adjacent battery units.

2. The battery pack according to claim 1, characterized in that: The battery unit includes a plurality of battery cells stacked along a length direction and / or a height direction of the pressure relief member.

3. The battery pack according to claim 1, characterized in that: The battery unit includes at least two battery cells stacked along the height direction of the pressure relief member; The pressure relief passage includes at least two first pressure relief passages and a second pressure relief passage, and the first pressure relief passages correspond to the explosion-proof valves of the battery cells stacked in a height direction of the pressure relief member.

4. The battery pack according to claim 3, characterized in that: The second pressure relief channel is disposed between the two first pressure relief channels, and the second pressure relief channel and the explosion-proof valve are disposed in a staggered manner in a height direction of the pressure relief component.

5. The battery pack according to claim 3, characterized in that: The first pressure relief channel is a concave arc surface curved toward one side of the pressure relief component, a convex arc surface curved away from one side of the pressure relief component, or an inclined surface inclined toward the center of the pressure relief component; The second pressure relief channel is a concave arc surface bent toward one side of the pressure relief component, a convex arc surface bent away from one side of the pressure relief component, or an inclined surface inclined toward the center of the pressure relief component; The innermost side of the second pressure relief channel is closer to the central symmetry plane of the pressure relief component than the innermost side of the first pressure relief channel.

6. The battery pack according to claim 1, characterized in that: The battery pack also includes a box body for accommodating the battery cells, the box body includes an upper box cover and a lower box body that are snap-fitted and sealed to each other, the plane where the explosion-proof valve is located is perpendicular to the plane where the outer surface of the upper box cover is located and / or the largest surface of the battery cell is parallel to the plane where the outer surface of the upper box cover is located.

7. The battery pack according to claim 6, characterized in that: The pressure relief component is fixed in the box body through a limiter, and the box body is provided with a pressure relief valve connected with the pressure relief channel.

8. The battery pack according to claim 7, characterized in that: A plurality of mounting grooves are provided on the bottom wall of the pressure relief member, and the position limiting member comprises a plurality of protruding columns provided on the bottom wall of the lower box body, and the protruding columns are plugged into and matched with the mounting grooves one by one; Alternatively, a support beam is further provided on the inner bottom wall of the lower box body, the length direction of the support beam is consistent with the extension direction of the pressure relief channel, and a plurality of the raised columns are arranged on the support beam along the length direction of the support beam.

9. The battery pack according to claim 6, characterized in that: An accommodating groove is provided on the inner top wall of the upper box cover, and the top of the pressure relief member is engaged with the accommodating groove; Alternatively, a U-shaped stopper is provided on the inner top wall of the upper box cover, the U-shaped stopper is connected to the inner top wall of the upper box cover, and the top of the pressure relief member is engaged with the accommodating groove.

10. A vehicle, characterized in that: The vehicle comprises the battery pack according to any one of claims 1 to 9, and the plane where the explosion-proof valve is located is perpendicular to the maximum outer surface of the vehicle chassis.

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