Blade battery and battery pack

Abstract

The utility model relates to the technical field of batteries, particularly provides a blade battery and a battery pack, and aims to solve the problem that the conventional blade battery is easy to cause thermal runaway. In order to achieve the purpose, the blade battery comprises a shell and a unit, at least one inner side wall of the shell is provided with a flow guide channel, and the shell is provided with an inner cavity; the pole group is positioned in the inner cavity of the shell; and the diversion channel is communicated with the inner cavity of the shell and is configured to collect hot air discharged by the pole group and discharge the hot air to the end part, provided with the anti-explosion valve, of the pole group. After the temperature of the pole group rises and hot air is generated, a part of hot air discharged by the pole group can enter the flow guide channel and is discharged through the flow guide channel, so that the hot air in the pole group is quickly discharged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, specifically provide a kind of blade battery and battery pack. BACKGROUND

[0002] In recent years, with the rise of new energy vehicles, as the power source of new energy vehicles-power battery also developed rapidly. Among them, the blade battery is a kind of power battery, assembled by CTP (Cell to Pack) or CTB (Cell to Body) mode, single battery skips "module" when grouping, greatly improves the volume utilization, can pack more single battery in the same space, to improve the maximum capacity of battery pack.

[0003] The existing blade battery is relatively long, and the single battery is easy to heat and release gas during charging and discharging. Once the hot gas cannot be discharged in time, it is easy to cause thermal runaway.

[0004] Therefore, there is an urgent need for a blade battery and battery pack to solve the problem of easy thermal runaway of existing blade batteries. INVENTION CONTENTS

[0005] The utility model aims at solving the above technical problem, that is, solving the problem of easy thermal runaway of existing blade batteries.

[0006] In the first aspect, the utility model provides a kind of blade battery, comprising: shell, at least one inner side wall is provided with flow guide passage, the shell has inner cavity;Pole group, located in the inner cavity of the shell;The flow guide passage is communicated with the inner cavity of the shell, the flow guide passage is configured to converge the hot gas discharged by the pole group and discharge to the end of the pole group provided with explosion-proof valve.

[0007] In the specific embodiment of the above blade battery, the flow guide passage is opened in the inner side wall to form a closed passage, and the inner side wall is provided with a communication hole to communicate the flow guide passage with the inner cavity of the shell.

[0008] In the specific embodiment of the above blade battery, at least one of the inner side walls is provided with a plurality of flow guide plates, one end of the flow guide plate is connected with the inner side wall, and the flow guide plates and the inner side wall are connected to form the flow guide passage with the opening towards the inner cavity.

[0009] In the specific embodiment of the above blade battery, one end of the flow guide plate away from the inner side wall is provided with a baffle, and the baffle is parallel to the inner side wall.

[0010] In the specific embodiments of the blade battery, the inner side surface of the shell is further provided with a flow collection channel, the flow collection channel is in communication with and crosswise arranged with the flow guide channel; and / or, the flow guide channel extends along the length direction of the pole group; and / or, a plurality of flow guide channels are arranged side by side; and / or, the flow guide channel is located at the narrow side wall of the shell.

[0011] In the specific embodiments of the blade battery, the flow guide channel is arranged on the inner side surface perpendicular to the width direction of the blade battery.

[0012] In the specific embodiments of the blade battery, the blade battery further comprises a side plate, the side plate is located between at least one side of the pole group and the shell, and the side plate is provided with an exhaust channel configured to collect the hot air discharged by the pole group and discharge the hot air to the end of the pole group.

[0013] In the specific embodiments of the blade battery, a plurality of exhaust channels are arranged side by side on the side plate; and / or, the exhaust channel extends along the length direction of the pole group; and / or, the surface of the side plate adhering to the pole group is a plane and is parallel to the side surface of the shell adhering to the side plate; and / or, the side plate is located between the narrow side of the shell and the pole group.

[0014] In the specific embodiments of the blade battery, the side plate comprises opposite first and second sides, the first and second sides of the side plate are both provided with the exhaust channel, and the side plate is provided with a ventilation hole for communicating the exhaust channels on both sides of the side plate.

[0015] In the specific embodiments of the blade battery, the blade battery further comprises a negative cover plate assembly and a positive cover plate assembly located at both ends of the shell along the length direction of the blade battery, at least one of the negative cover plate assembly and the positive cover plate assembly is provided with an explosion-proof valve, and the flow guide channel is in communication with the explosion-proof valve.

[0016] In the specific embodiments of the blade battery, the negative cover plate assembly comprises a negative cover plate and a first insulating member, the first insulating member is located on the side of the negative cover plate facing the pole group; the negative cover plate is provided with an exhaust port, the first insulating member is provided with an exhaust hole, the explosion-proof valve is fixed to the negative cover plate and corresponds to the exhaust port and the exhaust hole.

[0017] In the specific embodiments of the blade battery, the side of the first insulating member away from the negative cover plate is provided with an exhaust channel, the exhaust channel is used to communicate the flow guide channel and the exhaust hole.

[0018] In a second aspect, the utility model provides a battery pack, including the blade battery above.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model discloses a blade battery including shell and unit, at least one inside wall on shell is provided with the flow guide channel, and shell has the inner chamber, the pole group is located the inner chamber of shell, the flow guide channel is communicated with the inner chamber of shell, and the flow guide channel is configured to converge the hot gas of pole group and exports to the end of pole group setting explosion -proof valve.

[0021] Further, at least one side between pole group and shell is provided with the side plate, and the exhaust passage is arranged on the side plate, and the exhaust passage is configured to converge the hot gas of pole group and exports to the end of pole group, so as to form the channel for exhaust between pole group and shell, so as to further improve the exhaust efficiency of hot gas in pole group. BRIEF DESCRIPTION OF DRAWINGS

[0022] The preferred embodiments of the utility model are described below in combination with the drawings, and the drawings are as follows:

[0023] Figure 1 It is the explosion structure schematic drawing of the blade battery provided by the utility model,

[0024] Figure 2 It is the explosion structure schematic drawing of the negative electrode cover plate assembly provided by the utility model,

[0025] Figure 3 It is the structure schematic drawing of shell and pole group cooperation provided by the utility model,

[0026] Figure 4 It is the first partial cross section structure schematic drawing of the blade battery provided by the utility model,

[0027] Figure 5 It is another kind of cross section structure schematic drawing of the first partial of the blade battery provided by the utility model,

[0028] Figure 6 The front view of the second inside surface of the shell provided by the utility model is provided with the flow guide channel,

[0029] Figure 7 It is the structure schematic drawing of shell, side plate and pole group cooperation provided by the utility model,

[0030] Figure 8 It is the second partial cross section structure schematic drawing of the blade battery provided by the utility model,

[0031] Figure 9 is a structural schematic view of the side plate provided by the utility model.

[0032] Mark explanation:

[0033] 1, shell; 11, flow channel; 112, communication hole; 113, flow guide plate; 114, baffle; 12, flow channel; 13, inner cavity; 2, pole group; 3, negative cover plate assembly; 31, negative cover plate; 311, exhaust port; 32, first insulating piece; 321, accommodating groove; 322, exhaust hole; 33, second insulating piece; 34, negative pole; 341, insulating sealing ring; 35, explosion-proof valve; 36, explosion-proof valve protection sheet; 37, negative top patch; 38, negative adapter plate; 39, riveting block; 4, positive cover plate assembly; 41, positive top patch; 42, positive adapter plate; 5, isolation film; 6, blue film; 7, side plate; 71, exhaust passage. Specific implementation

[0034] The preferred embodiments of the utility model are described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the utility model, and are not intended to limit the protection scope of the utility model.

[0035] It should be noted that in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the direction or positional relationship terms based on the direction or positional relationship shown in the drawings, which are only for the convenience of description, and are not intended to indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0036] In addition, it should also be noted that in the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] The blade battery comprises a shell, a pole group, a negative cover plate assembly and a positive cover plate assembly, the pole group is arranged in the shell, and the negative cover plate assembly and the positive cover plate assembly are arranged at two ends of the shell along the length direction of the blade battery. At least one of the negative cover plate assembly or the positive cover plate assembly is provided with an explosion-proof valve.

[0038] The pole group comprises a negative pole lug and a positive pole lug, the negative pole lug is located at one end of the pole group close to the negative cover plate assembly, and the positive pole lug is located at one end of the pole group close to the positive cover plate assembly. The negative cover plate assembly is provided with a negative pole post, and the negative pole post is electrically connected with the negative pole lug. The positive cover plate assembly is provided with a positive pole post, and the positive pole post is electrically connected with the positive pole lug.

[0039] The length of the blade battery is generally long, and the pole group is prone to expansion due to temperature rise during charging and discharging. When the temperature of the pole group rises to a certain degree, a side reaction will occur to generate gas, thereby causing further expansion of the pole group. If the expansion degree of the pole group is low, there is still a certain gap between the pole group and the shell, and the hot gas in the pole group can be discharged to the area where the explosion-proof valve is located along the gap between the pole group and the shell. If the expansion degree of the pole group is high, the gap between the pole group and the shell will be reduced or even blocked. If the gap between the pole group and the shell is too small, the hot gas in the pole group cannot be discharged in time, and the pressure in the shell is difficult to quickly reach the set value, which will cause the explosion-proof valve to open not in time, accelerate the risk of thermal runaway, and affect the safety performance of the blade battery; if the expansion speed of the pole group is too fast, the gap between the pole group and the shell can be completely blocked, and the hot gas in the pole group is more difficult to discharge, which will cause the explosion-proof valve to be unable to open, accelerate the risk of thermal runaway, and affect the safety performance of the blade battery.

[0040] Based on this, the utility model provides a kind of blade battery, including shell and machine group, shell at least one inner side wall is provided with flow guide passage, shell has inner cavity;Pole group, located in the inner cavity of shell;Flow guide passage is communicated with the inner cavity of shell, flow guide passage is configured as the hot gas of pole group is discharged and is discharged to the end of pole group.

[0041] The blade battery of the utility model will be described below by specific examples.

[0042] As Figure 1 As shown in the figure, the blade battery includes a shell 1, a pole group 2, a negative cover plate assembly 3, a positive cover plate assembly 4 and a separator 5. The shell 1 has an inner cavity 13, and the pole group 2 is arranged in the inner cavity 13 of the shell 1. The negative cover plate assembly 3 and the positive cover plate assembly 4 are arranged at the two ends of the shell 1 along the length direction (i.e. Z direction) of the blade battery, for protecting the pole group 2 and closing the shell 1. The separator 5 is located between the pole group 2 and the shell 1, and the first end of the separator 5 is fixed and sealed with the negative cover plate assembly 3, and the second end of the separator 5 is fixed and sealed with the positive cover plate assembly 4. The outer periphery of the shell 1 is covered with a blue film 6.

[0043] The pole group 2 is also called a bare battery cell. The pole group 2 comprises a negative pole lug and a positive pole lug, the negative pole lug is located at one end of the pole group 2 close to the negative cover plate assembly 3, and the positive pole lug is located at one end of the pole group 2 close to the positive cover plate assembly. In combination Figure 1 and Figure 2As shown, the negative cover plate assembly 3 is provided with a negative post 34, and the negative post 34 is electrically connected to the negative tab through a negative adapter piece 38. The positive cover plate assembly 4 is provided with a positive post, and the positive post is electrically connected to the positive tab through a positive adapter piece 42.

[0044] As shown in FIG. 1, the battery cell 1 includes a positive cover plate assembly 4, a negative cover plate assembly 3, a plurality of positive tabs 41, a plurality of negative tabs 37, a plurality of positive posts 42, a plurality of negative posts 34, a plurality of positive adapter pieces 42, a plurality of negative adapter pieces 38, a plurality of positive top tabs 41, a plurality of negative top tabs 37, and a plurality of explosion-proof valves 35. Figure 1 As shown, the negative cover plate assembly 3 is provided with a negative top tab 37 on the side away from the pole group 2 to protect the negative cover plate assembly 3, and the positive cover plate assembly 4 is provided with a positive top tab 41 on the side away from the pole group 2 to protect the positive cover plate assembly 4.

[0045] As shown in FIG. 1, the battery cell 1 includes a positive cover plate assembly 4, a negative cover plate assembly 3, a plurality of positive tabs 41, a plurality of negative tabs 37, a plurality of positive posts 42, a plurality of negative posts 34, a plurality of positive adapter pieces 42, a plurality of negative adapter pieces 38, a plurality of positive top tabs 41, a plurality of negative top tabs 37, and a plurality of explosion-proof valves 35. Figure 2 As shown in FIG. 1, the battery cell 1 includes a positive cover plate assembly 4, a negative cover plate assembly 3, a plurality of positive tabs 41, a plurality of negative tabs 37, a plurality of positive posts 42, a plurality of negative posts 34, a plurality of positive adapter pieces 42, a plurality of negative adapter pieces 38, a plurality of positive top tabs 41, a plurality of negative top tabs 37, and a plurality of explosion-proof valves 35. Figure 1 The first insulating piece 32 is located on the side of the negative cover plate 31 facing the pole group 2, and the second insulating piece 33 is located on the side of the negative cover plate 31 away from the pole group 2. The post passes through the first insulating piece 32, the negative cover plate 31, and the second insulating piece 33 from the side of the negative cover plate 31 away from the first insulating piece 32 and then emerges. The edge of the first insulating piece 32 protrudes toward the side away from the negative cover plate 31, and a receiving groove 321 is formed in the middle of the first insulating piece 32. The negative adapter piece 38 is located in the receiving groove 321 and is electrically connected to the negative post 34, which can be laser welded. An insulating sealing ring 341 is provided on the negative post 34 to isolate the negative post 34 and the negative cover plate 31. The second insulating piece 33 is provided with a riveting block 39 on the side away from the negative cover plate 31, and the riveting block 39 is riveted to the negative post 34 to fix the negative post 34.

[0046] The positive cover plate assembly 4 is similar in structure to the negative cover plate assembly 3, and at least one of the negative cover plate assembly 3 and the positive cover plate assembly 4 is provided with an explosion-proof valve 35. Figure 2

[0047] For example, the negative cover plate assembly 3 further includes an explosion-proof valve 35, and the explosion-proof valve 35 is provided with an explosion-proof valve protection tab 36. The negative cover plate 31 is provided with an exhaust port 311, and the first insulating piece 32 is provided with an exhaust hole 322. The explosion-proof valve 35 is fixed to the negative cover plate 31 and corresponds to the exhaust port 311 and the exhaust hole 322. The exhaust hole 322 can be provided as an exhaust mesh hole. When the pressure in the blade battery reaches a preset pressure, the explosion-proof valve 35 can be opened to release the hot gas in the blade battery to reduce the risk of thermal runaway of the blade battery.

[0048] As shown in FIG. 1, the battery cell 1 includes a positive cover plate assembly 4, a negative cover plate assembly 3, a plurality of positive tabs 41, a plurality of negative tabs 37, a plurality of positive posts 42, a plurality of negative posts 34, a plurality of positive adapter pieces 42, a plurality of negative adapter pieces 38, a plurality of positive top tabs 41, a plurality of negative top tabs 37, and a plurality of explosion-proof valves 35. Figures 3 to 6 ​As shown, at least one inner surface of the housing 1 is provided with a flow channel 11. After the temperature of the electrode group 2 rises and generates hot gas, a portion of the hot gas in the electrode group 2 can enter the flow channel 11 and flow through the flow channel 11 to the explosion-proof valve 35 located at at least one end of the electrode group 2, thereby quickly discharging the hot gas in the electrode group 2.

[0049] Among them, such as Figure 6 As shown in the specific example of this disclosure, the flow channel 11 is disposed on the narrow sidewall of the housing 1 to minimize the volume occupied by the flow channel 11. The flow channel 11 extends along the length direction (i.e., the Z direction) of the electrode group 2, and the end of the flow channel 11 extends beyond or is flush with the end of the electrode group 2 to ensure that the hot gas discharged along the flow channel 11 can smoothly enter the explosion-proof valve 35 located at the end of the electrode group 2. Of course, in other possible embodiments, the flow channel 11 can also be configured as a channel of other shapes, as long as the flow channel 11 can connect the inner cavity 13 of the housing 1 and the space at the end of the electrode group 2. In this case, the flow channel 11 can discharge the hot gas released by the electrode group 2 to the explosion-proof valve 35 located at the end of the electrode group 2.

[0050] In some examples, such as Figure 4 As shown, the flow channel 11 is formed within the inner wall of the housing 1 to create a closed channel, while a connecting hole 112 is provided on the inner wall to connect the flow channel 11 with the inner cavity 13. The hot gas generated by the temperature rise of the electrode assembly 2 can quickly enter the flow channel 11 through the connecting hole 112 and flow along the flow channel 11 to the location of the explosion-proof valve 35, thereby releasing the hot gas and reducing the risk of thermal runaway.

[0051] In other examples, such as Figure 5 As shown, at least one inner sidewall of the housing 1 is provided with a guide plate 113, one end of which is connected to the inner sidewall. Two adjacent guide plates 113 and the inner sidewall enclose a guide channel 11 with an opening facing the inner cavity 13. The hot gas generated by the temperature rise of the electrode assembly 2 can directly enter the guide channel 11 from the opening facing the inner cavity 13, and the hot gas is released more quickly. In addition, after the electrode assembly 2 heats up and generates hot gas expansion, it will at most only adhere to the end of the guide plate 113 away from the inner sidewall, and will not block the guide channel 11 recessed on the inner surface of the housing 1. Therefore, the hot gas in the electrode assembly 2 can still be discharged from the guide channel 11 in a timely manner to quickly open the explosion-proof valve 35 and reduce the possibility of thermal runaway of the blade battery.

[0052] The flow channel 11 can be formed by cutting, or it can be formed by welding the flow guide plate 113 to the inner wall of the shell 1 and then enclosing it with the flow guide plate 113.

[0053] In some possible solutions, the deflector 113 is provided with a baffle plate 114 away from one end of the inner side wall connected thereto, and the baffle plate 114 is parallel to the inner side wall connected thereto. An opening is formed between two adjacent baffle plates 114 to avoid blocking the flow guide channel 11 and the inner cavity 13. The baffle plate 114 can increase the contact area of the shell 1 and the pole group 2, and reduce the possibility of the deflector 113 on the shell 1 scratching the pole group 2.

[0054] The inner side surface of the shell 1 perpendicular to the thickness direction (i.e., the X direction) of the blade battery is defined as a first inner side surface, and the inner side surface of the shell 1 perpendicular to the width direction (i.e., the Y direction) of the blade battery is defined as a second inner side surface. The first inner side surface is adjacent to the second inner side surface. In the process of assembling the blade battery into a group, the adjacent blade batteries are arranged in the thickness direction (the X direction). For example, the flow guide channel 11 is arranged on the second inner side surface. At this time, the arrangement of the flow guide channel 11 does not increase the size of the blade battery in the arrangement direction, but only slightly increases the size of the blade battery in the width direction (the Y direction), and has little effect on the capacity of the assembled battery pack.

[0055] Of course, it should be noted that although the flow guide channel 11 is arranged only on one second inner side surface of the shell 1 in this example, this is not a specific limitation of the utility model, and in other embodiments, the flow guide channel 11 can be arranged on any one or more first inner side surfaces and second inner side surfaces without departing from the principles of the utility model, which should be included in the protection scope of the utility model.

[0056] In some examples, as shown in Figure 6 The flow guide channel 11 is arranged side by side with multiple flow guide channels 11 to improve the efficiency of discharging hot gas in the pole group 2.

[0057] In some examples, the inner side surface of the shell 1 is further provided with a flow convergence channel 12, and the flow convergence channel 12 is arranged in communication with and intersecting the flow guide channel 11. The flow convergence channel 12 can increase the path of the hot gas in the pole group 2 to the flow guide channel 11, and improve the discharge efficiency of the hot gas in the pole group 2. The faster the hot gas is discharged from the pole group 2, the shorter the response time of the explosion-proof valve 35, and the lower the risk of thermal runaway of the blade battery.

[0058] In some examples, the first insulating member 32 is provided with an exhaust channel (not shown in the figure) away from one side of the negative electrode cover plate 31, and the exhaust channel is in communication with the accommodation groove 321 and the flow guide channel 11, so that the hot gas flowing out of the flow guide channel 11 can smoothly pass through the accommodation groove 321 and the exhaust hole 322 to the vicinity of the explosion-proof valve 35.

[0059] In some examples, as shown in Figure 7 The blade battery further includes a side plate 7 between at least one side of the pole group 2 and the shell 1. As shown in Figure 8 andFigure 9 As shown, the side plate 7 is provided with an exhaust passage 71. By means of the exhaust passage 71 of the side plate 7, a passage for exhaust can also be formed between the pole group 2 and the shell 1, so as to further improve the exhaust efficiency of the hot gas in the pole group 2. For example, the side plate 7 is parallel to the first inner side surface and is located on one side of the pole group 2.

[0060] In the examples of the present disclosure, the exhaust passage 71 extends along the length direction (i.e. the Z direction) of the blade battery, of course, this is not a specific limitation of the present disclosure, in other possible embodiments, the exhaust passage 71 can also be provided in other shapes, as long as the hot gas near the pole group 2 can be exhausted to the end of the pole group 2.

[0061] In the examples of the present disclosure, the exhaust passage 71 extends along the length direction (i.e. the Z direction) of the blade battery, of course, this is not a specific limitation of the present disclosure, in other possible embodiments, the exhaust passage 71 can also be provided in other shapes, as long as the hot gas near the pole group 2 can be exhausted to the end of the pole group 2.

[0062] The surface of the side plate 7 abutting the pole group 2 is a plane and is parallel to the side surface of the shell 2 abutting the side plate 7, so as to ensure that the area of the side plate 7 abutting the pole group 2 has no sharp part that can damage the pole group 2.

[0063] The exhaust passage 71 can be provided in plurality on the side plate 7 in parallel, so as to improve the exhaust efficiency of the hot gas in the pole group 2. Meanwhile, the side plate 7 includes opposite first and second sides, and the first and second sides of the side plate 7 can be provided with the exhaust passage 71. The side plate 7 is provided with a vent hole for connecting the exhaust passages 71 on the two sides of the side plate 7, so as to further improve the exhaust efficiency of the pole group 2. At this time, the side plate 7 can be formed by stamping or the like.

[0064] For example, the exhaust passage 71 and the flow guide passage 11 are provided on opposite sides of the pole group 2. The cross-sectional shape of the exhaust passage 71 and the flow guide passage 11 can be triangular, rectangular or trapezoidal, as long as the flow can be guided.

[0065] In summary, the blade battery provided by the present disclosure has at least the following advantages:

[0066] (1) At least one inner side surface of the shell 1 is provided with a flow guide passage 11. After the temperature of the pole group 2 rises and hot gas is generated, a part of the hot gas in the pole group 2 can enter the flow guide passage 11 and flow to the explosion-proof valve 35 at least one end of the pole group 2 through the flow guide passage 11, so as to quickly exhaust the hot gas in the pole group 2, so as to quickly open the explosion-proof valve 35 and reduce the possibility of thermal runaway of the blade battery.

[0067] (2) at least one side of the pole group 2 and the shell 1 is provided with a side plate 7, the side plate 7 is provided with exhaust passage 71 extending along the length direction of the blade battery, so as to form a channel for exhaust between the pole group 2 and the shell 1, so as to further improve the exhaust efficiency of hot gas in the pole group 2.

[0068] The utility model further provides a battery pack, including any one embodiment described above blade battery, multiple blade batteries arrange along its thickness direction (namely X direction) and carry out series connection.

[0069] Up to now, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without deviating from the principles of the utility model, those skilled in the art can make equivalent changes or replacements to related technical features, and the technical schemes after these changes or replacements will all fall within the protection scope of the utility model.

Claims

1. A blade battery, characterized in that, include: The housing (1) has at least one flow channel (11) on its inner sidewall and has an inner cavity; The pole group (2) is located in the inner cavity of the housing (1); The flow channel (11) is connected to the inner cavity of the housing (1), and the flow channel (11) is configured to collect the hot gas discharged from the electrode group (2) and discharge it to the end of the electrode group (2) where the explosion-proof valve is provided.

2. The blade battery according to claim 1, characterized in that, The flow channel (11) is formed in the inner wall to form a closed channel, and a connecting hole (112) is provided on the inner wall to connect the flow channel (11) with the inner cavity of the shell.

3. The blade battery according to claim 1, characterized in that, At least one of the inner sidewalls is provided with a plurality of guide plates (113), one end of the guide plate (113) is connected to the inner sidewall, and two adjacent guide plates (113) and the inner sidewall enclose to form a guide channel (11) with an opening facing the inner cavity.

4. The blade battery according to claim 3, characterized in that, A baffle (114) is provided at the end of the guide plate (113) away from the inner sidewall to which it is connected. The baffle (114) is parallel to the inner sidewall to which it is connected, and an opening is formed between two adjacent baffles.

5. The blade battery according to any one of claims 1 to 4, characterized in that, The inner surface of the housing (1) is further provided with a confluence channel (12), which is connected to and intersects with the guide channel (11); and / or, The flow channel (11) extends along the length direction of the pole group (2); and / or, Multiple flow channels (11) are arranged side by side; and / or, The flow channel (11) is located on the narrow sidewall of the housing (1).

6. The blade battery according to claim 1, characterized in that, The flow channel (11) is disposed on the inner surface perpendicular to the width direction of the blade battery.

7. The blade battery according to claim 1, characterized in that, The blade battery also includes a side plate (7) located between at least one side of the electrode assembly (2) and the housing (1). The side plate (7) is provided with an exhaust channel (71) configured to collect the hot gas discharged from the electrode assembly (2) and discharge it to the end of the electrode assembly (2).

8. The blade battery according to claim 7, characterized in that, The exhaust channels (71) are arranged side by side on the side plate (7); and / or, The exhaust passage (71) extends along the length of the pole group (2); and / or, The surface of the side plate (7) that adheres to the pole assembly (2) is planar and parallel to the side surface of the housing (1) to which the side plate (7) is adhered; and / or, The side plate (7) is located between the narrow side of the housing (1) and the pole group (2).

9. The blade battery according to claim 7, characterized in that, The side plate (7) includes a first side and a second side opposite to each other. The first side and the second side of the side plate (7) are provided with the exhaust channel (71), and the side plate (7) is provided with a vent hole for connecting the exhaust channel (71) located on both sides of the side plate (7).

10. The blade battery according to claim 1, characterized in that, The blade battery also includes a negative electrode cover plate assembly (3) and a positive electrode cover plate assembly (4) located at both ends of the housing (1) along the length direction of the blade battery. At least one of the negative electrode cover plate assembly (3) and the positive electrode cover plate assembly (4) is provided with an explosion-proof valve (35). The flow channel (11) is connected to the explosion-proof valve (35).

11. The blade battery according to claim 10, characterized in that, The negative electrode cover plate assembly (3) includes a negative electrode cover plate (31) and a first insulating member (32), wherein the first insulating member (32) is located on the side of the negative electrode cover plate (31) facing the electrode group (2); The negative electrode cover plate (31) is provided with an exhaust port (311), and the first insulating member (32) is provided with an exhaust hole (322). The explosion-proof valve (35) is fixed to the negative electrode cover plate (31) and corresponds to the exhaust port (311) and the exhaust hole (322).

12. The blade battery according to claim 11, characterized in that, The first insulating member (32) has an exhaust channel on the side away from the negative electrode cover plate (31), and the exhaust channel is used to connect the flow channel (11) and the exhaust hole (322).

13. A battery pack, characterized in that, Including the blade battery as described in any one of claims 1 to 12.

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