Battery and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery and a battery pack. The battery comprises a shell and a battery cell assembly accommodated in the shell. The shell comprises a shell body and a cover body. The battery further comprises an electrode terminal and an anti-explosion valve, the electrode terminal is arranged on the cover body, the anti-explosion valve is arranged on the shell, the shell comprises a first plate, and the first plate is provided with an anti-explosion hole for installing the anti-explosion valve; an avoiding groove is formed in one side, facing the battery cell assembly, of the first plate in a sunken manner, and the avoiding groove is communicated with the explosion-proof hole. And the arrangement of the avoiding groove enables an interval space to be formed between the battery cell assembly and the first plate, so that the discharge smoothness of the anti-explosion valve during thermal runaway is ensured. And moreover, the avoiding groove is directly integrated on the first plate, so that the internal space or the external space of the shell cannot be additionally occupied, and the energy density of the battery is considered on the premise of ensuring the safety of the battery.

Description

Technical Field

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

[0002] In the field of new energy technology, batteries are core products, and safety performance is one of the important indicators for measuring battery performance.

[0003] Thermal separation technology has become a key design consideration for manufacturers. This technology places the battery's electrode terminals and explosion-proof valve on separate sides, minimizing the impact of electrolyte and high-temperature gases ejected from the valve during thermal runaway on the electrode terminals. However, this reduces the clearance between the valve and the battery cell assembly inside the battery casing, making the valve susceptible to clogging.

[0004] Application Contents

[0005] The present application provides a battery and a battery pack to ensure smooth discharge of an explosion-proof valve without occupying the internal or external space of the battery.

[0006] A battery comprises: a housing, comprising a shell and a cover, the shell having an open accommodating cavity, the cover covering the opening to seal the accommodating cavity; a cell assembly disposed in the accommodating cavity; and electrode terminals and an explosion-proof valve, the electrode terminals being disposed on the cover, the explosion-proof valve being disposed on the shell, the shell comprising a first plate, the first plate being provided with an explosion-proof hole for installing the explosion-proof valve; wherein a side of the first plate facing the cell assembly is recessed and provided with an avoidance groove, the avoidance groove being connected to the explosion-proof hole.

[0007] In the embodiments of the present application, the design of the escape groove creates a space between the battery cell assembly and the first plate. In the event of thermal runaway, emissions such as gas and electrolyte can flow through the space to the explosion-proof hole for discharge, ensuring smooth discharge from the explosion-proof valve during thermal runaway. Furthermore, the escape groove is directly integrated into the first plate, eliminating the need for components such as brackets within the housing or designing the first plate to protrude outward. The formation of the space does not occupy additional space inside or outside the housing, thus maintaining battery safety while also balancing energy density.

[0008] As an optional embodiment of the present application, it also includes a baffle, which is fixedly installed on the side of the first plate facing the battery cell assembly, and the baffle is provided with a discharge hole corresponding to the avoidance groove and a collection hole corresponding to the explosion-proof hole.

[0009] In the embodiments of the present application, the battery cell assembly is composed of positive and negative electrode sheets, as well as a separator, through a lamination or winding process. When the battery thermal runaway occurs, the high temperature and flames can cause the positive and negative electrode sheets, or the separator to melt or soften, resulting in the dislocation and entanglement of the battery cell assembly, and ultimately the formation of solid or solid-liquid mixed emissions, which may cause the escape groove to be blocked. Therefore, in this solution, the baffle covers the escape groove, which can block most of the solid or solid-liquid emissions. This allows a stable discharge channel to be formed between the baffle and the escape groove, further ensuring the smooth discharge of high-temperature gases or electrolytes.

[0010] As an optional embodiment of the present application, a fitting groove is formed on the peripheral edge of the first plate, the orthographic projection of the fitting groove on the first plate covers the orthographic projection of the avoidance groove on the first plate, and the baffle is fitted and fixed in the fitting groove.

[0011] In the embodiment of the present application, the baffle occupies the thickness space of the first plate, which can reduce the space occupied by the accommodating cavity, thereby forming an exhaust channel between the baffle and the avoidance groove while reducing the space occupied by the baffle in the accommodating cavity, thereby improving space utilization.

[0012] As an optional embodiment of the present application, the first plate includes a main body and a frame portion. The main body has a first surface facing the battery cell assembly. The main body is recessed from the first surface to form an avoidance groove. The frame portion is protruding from the peripheral edge of the first surface. The frame portion and the first surface are combined to form an interlocking groove.

[0013] In an embodiment of the present application, the interlocking groove and the avoidance groove are arranged in a gradient in the direction away from the battery cell assembly. The main function of the interlocking groove is to form a larger spacing space between the battery cell assembly and the first plate to avoid blockage of electrolyte and high-temperature gas during thermal runaway, while the avoidance groove mainly plays a guiding role, enabling the electrolyte and high-temperature gas to converge along the trajectory of the avoidance groove toward the explosion-proof hole to improve the efficiency of emission discharge.

[0014] As an optional embodiment of the present application, the frame portion has a second surface facing the battery cell assembly, the baffle has a third surface facing the battery cell assembly, the third surface is located on the side of the second surface facing away from the battery cell assembly, or the third surface is flush with the second surface.

[0015] In an embodiment of the present application, the position of the baffle is further limited, and the third side of the baffle is lower than the second side of the frame, so that the baffle is completely embedded in the fitting groove, and the baffle does not occupy the space of the accommodating cavity at all, which further improves the space utilization of the battery.

[0016] As an optional embodiment of the present application, the avoidance groove includes at least one diversion channel, which is connected to the explosion-proof hole; the diversion channel has a proximal end close to the explosion-proof hole and a distal end away from the explosion-proof hole, and the diversion channel extends from the proximal end to the distal end, and the flow area of ​​the diversion channel increases gradually from the distal end to the proximal end.

[0017] As an optional embodiment of the present application, a plurality of diversion channels are provided, and the plurality of diversion channels are arranged at intervals along the circumference of the explosion-proof hole.

[0018] In an embodiment of the present application, when the battery thermally runs away, emissions such as electrolyte and high-temperature gas flow from the distal end to the proximal end along the bypass channel, and are finally discharged outward through the explosion-proof hole. During this period, the magnitude of the emissions gradually increases. In this embodiment, since the flow area gradually increases from the distal end to the proximal end, this enables the bypass channel to better adapt to the gradually increasing emission of emissions, and can further ensure that the emissions are discharged more smoothly.

[0019] As an optional embodiment of the present application, the discharge holes are arranged at intervals along the extension direction of the avoidance groove.

[0020] As an optional embodiment of the present application, the flow area of ​​the discharge hole increases gradually from the distal end to the proximal end.

[0021] In the embodiment of the present application, the design of the discharge hole matches the design of the flow area of ​​the avoidance groove to facilitate the smooth discharge of the emissions.

[0022] As an optional embodiment of the present application, the avoidance groove includes a main groove and a sub-groove, the main groove extends along a preset direction, one end of the main groove is connected to the explosion-proof hole, and the sub-groove is connected to the main groove so that the sub-groove is connected to the explosion-proof hole through the main groove.

[0023] As an optional embodiment of the present application, the sub-grooves are arranged on both sides of the main groove along the extension direction of the main groove, and a plurality of sub-grooves on each side are arranged at intervals along the extension direction of the main groove.

[0024] In the embodiment of the present application, the main trough plays a better guiding role to facilitate the orderly outflow of emissions. The sub-trough can provide a buffer area for the main trough when there is a lot of emissions, reducing the blockage of the main trough. The main trough and the sub-trough cooperate with each other to form a smoother emission network.

[0025] As an optional embodiment of the present application, the orthographic projection area of ​​the avoidance groove on the side of the first plate facing the battery cell assembly is S1, and the area of ​​the side of the first plate facing the battery cell assembly is S2, satisfying 0.3≤s1 / s2≤0.9.

[0026] As an optional embodiment of the present application, the distance between the bottom surface of the avoidance groove and the side of the first plate facing the battery cell assembly is h, and the thickness of the first plate is t, satisfying 0.1≤h / t≤0.7.

[0027] In the embodiment of the present application, the depth design and area design of the avoidance groove can ensure the structural strength of the first plate while integrating the structure of the avoidance groove to ensure the reliability of the shell.

[0028] On the other hand, a battery pack is provided, comprising the battery described above.

[0029] One of the above technical solutions has the following advantages or beneficial effects: the avoidance groove creates a space between the battery cell assembly and the first plate. In the event of thermal runaway, emissions such as gas and electrolyte can flow through the space to the explosion-proof hole for discharge, ensuring smooth discharge from the explosion-proof valve during thermal runaway. This ensures both battery safety and energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0031] Figure 1 This is an overall exploded view of the battery provided in an embodiment of the present application;

[0032] Figure 2 This is an overall exploded view of the battery provided in an embodiment of the present application from another perspective;

[0033] Figure 3 is an exploded structural diagram of the first plate and baffle structure provided in an embodiment of the present application;

[0034] Figure 4 is an exploded view provided in an embodiment of the present application for illustrating the structure of the first plate;

[0035] Figure 5 is a cross-sectional view provided in an embodiment of the present application for illustrating the structure of the first plate;

[0036] Figure 6 This embodiment of the present application provides Figure 5 A partial enlarged view of part A;

[0037] Figure 7 This is a schematic diagram of a first plate and baffle structure of another embodiment provided in an embodiment of the present application;

[0038] Figure 8 This is a schematic diagram of the first plate and baffle structure of another embodiment provided in the embodiments of the present application.

[0039] Reference numerals: 1, outer shell; 11, housing; 111, shell body; 12, cover; 10, accommodating cavity;

[0040] 2. Battery cell assembly; 21. Core; 22. Tab bundle;

[0041] 3. Electrode terminal; 4. Explosion-proof valve;

[0042] 5. First plate; 50. Avoidance groove; 500. Explosion-proof hole;

[0043] 51, main body; 51a, first surface; 52, frame; 52a, second surface;

[0044] 501, shunt channel; 5011, proximal end; 5012, distal end;

[0045] 505, main slot; 506, sub-slot; 508, secondary slot;

[0046] 6. Baffle; 6a. Third side; 60. Discharge hole; 600. Collection hole;

[0047] 70. Fitting slot. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0049] In the description of this application, it should be noted that, unless otherwise specified or limited, the term "and / or" herein is merely a description of an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " herein, unless otherwise specified, generally indicates that the associated objects are in an "or" relationship.

[0050] The following is combined with Figure 1-8 This application is further described.

[0051] Reference Figure 1 and Figure 2 , is a battery disclosed in this application, comprising a shell 1 and a battery cell assembly 2, wherein a receiving cavity 10 is provided in the shell 1, and the battery cell assembly 2 is provided in the receiving cavity 10.

[0052] The housing 1 includes a shell 11 and a cover 12 . The shell 11 has an open accommodating cavity 10 . The cover 12 covers the opening to seal the accommodating cavity 10 .

[0053] The battery also includes electrode terminals 3 and an explosion-proof valve 4. The electrode terminals 3 are mounted on the cover 12, and the explosion-proof valve 4 is mounted on the housing 11. The housing 11 includes a first plate 5 having an explosion-proof hole 500 for mounting the explosion-proof valve 4. A recessed groove 50 is provided on the side of the first plate 5 facing the cell assembly 2, and the recess 50 communicates with the explosion-proof hole 500.

[0054] Specifically, in the embodiment of the present application, the battery has a first direction Z, and the housing 11 includes a body 111 and a first plate 5. The body 111 is a square cylindrical structure that passes through in the first direction Z. Both ends of the body 111 in the first direction Z are open. The first plate 5 is covered along the first direction Z on one end of the body 111, forming the housing 11. The cover 12 is covered along the first direction Z on the other end of the body 111, thereby sealing the accommodating cavity 10.

[0055] The battery cell assembly 2 is made of positive electrode sheets, negative electrode sheets and diaphragms through lamination or winding processes. The battery cell assembly 2 includes a core body 21 and a tab bundle 22. The tab bundle 22 is electrically connected to the electrode terminal 3 of corresponding polarity to achieve electrical conduction between the battery cell assembly 2 and the outside world.

[0056] In the embodiment of the present application, the design of the escape groove 50 allows for a separation space to be formed between the battery cell assembly 2 and the first plate 5. In the event of thermal runaway of the battery, emissions such as gas and electrolyte can flow through the separation space to the explosion-proof hole 500 for discharge, ensuring smooth discharge from the explosion-proof valve 4 during thermal runaway. Furthermore, the escape groove 50 is directly integrated into the first plate 5, eliminating the need to install components such as brackets within the housing 1 or to design the first plate 5 to protrude outward. The formation of the separation space does not occupy additional space inside or outside the housing 1, thus maintaining both battery safety and energy density.

[0057] Reference Figure 2-Figure 4 As an optional embodiment of the present application, the first plate 5 includes an integrally connected main body 51 and a frame 52. The main body 51 has a first surface 51a facing the battery cell assembly 2. The main body 51 is recessed from the first surface 51a to form the aforementioned avoidance groove 50. The frame 52 is protruding from the first surface 51a and is annularly arranged around the peripheral edge of the first surface 51a. The frame 52 and the first surface 51a together form a fitting groove 70.

[0058] In the embodiment of the present application, the orthographic projection of the interlocking groove 70 on the first surface 51a can cover the avoidance groove 50, and the interlocking groove 70 and the avoidance groove 50 are arranged in a gradient in the direction away from the battery cell assembly 2. The main function of the interlocking groove 70 is to form an integral spacing space between the battery cell assembly 2 and the first plate 5 to prevent blockage of electrolyte and high-temperature gas during thermal runaway, while the avoidance groove 50 not only avoids but also guides the electrolyte and high-temperature gas along the trajectory of the avoidance groove 50 toward the explosion-proof hole 500. The combination of the two can effectively improve the smoothness of emission discharge.

[0059] As an optional embodiment of the present application, the battery further includes a baffle 6 , which is embedded in the fitting groove 70 . The baffle 6 is provided with a discharge hole 60 communicating with the avoidance groove 50 and a collecting hole 600 communicating with the explosion-proof hole 500 .

[0060] In the embodiment of the present application, the battery cell assembly 2 is made of positive electrode sheets, negative electrode sheets, and a separator through a lamination or winding process. When the battery thermal runaway occurs, the high temperature and flames will cause the positive electrode sheets, negative electrode sheets, or separator to melt or soften, resulting in the dislocation and entanglement of the battery cell assembly 2, and ultimately forming solid or solid-liquid mixed emissions, which may cause the avoidance groove 50 to be blocked. Therefore, in this solution, when the baffle 6 is embedded in the interlocking groove 70, the baffle 6 also covers the avoidance groove 50. The baffle 6 can block most of the solid or solid-liquid emissions, so that the baffle 6 and the avoidance groove 50 can form a stable discharge channel, further ensuring the smooth discharge of high-temperature gas or electrolyte. At the same time, because the interlocking groove 70 occupies the thickness of the first plate 5 itself, the baffle 6 is embedded in the interlocking groove 70. Therefore, the baffle 6 is equivalent to occupying the thickness of the first plate 5, which means that the baffle 6 does not occupy the internal space of the housing 1 or occupies as little internal space as possible. The ultimate effect is to ensure the smooth discharge of emissions while taking into account the energy density of the battery.

[0061] In one example, the frame portion 52 has a second surface 52a facing the battery cell assembly 2, and the baffle 6 has a third surface 6a facing the battery cell assembly 2. When the baffle 6 is inserted into the fitting groove 70, the third surface 6a is located on the side of the second surface 52a facing away from the battery cell assembly 2, or the third surface 6a and the second surface 52a are flush. In the embodiment of the present application, the above setting can completely hide the baffle 6 within the fitting groove 70, so that the baffle 6 does not occupy the internal space of the housing 1.

[0062] As an optional embodiment of the present application, the avoidance groove 50 includes at least one diversion channel 501, which is connected to the explosion-proof hole 500; the diversion channel 501 has a proximal end 5011 close to the explosion-proof hole 500 and a distal end 5012 away from the explosion-proof hole 500, and the avoidance groove 50 extends from the proximal end 5011 to the distal end 5012, and the flow area of ​​the diversion channel 501 remains unchanged or gradually increases from the distal end 5012 to the proximal end 5011.

[0063] In an embodiment of the present application, when the battery thermally runs away, emissions such as electrolyte and high-temperature gas flow along the bypass channel 501 from the distal end 5012 to the proximal end 5011, and are finally discharged outward through the explosion-proof hole 500. During this period, the magnitude of the emissions gradually increases. In this embodiment, since the flow area gradually increases from the distal end 5012 toward the proximal end 5011, the bypass channel 501 can better adapt to the gradually increasing emission of emissions, and can further ensure that the emissions are discharged more smoothly.

[0064] Specifically, multiple diverter channels 501 are provided, spaced apart along the circumference of the explosion-proof hole 500. In one example, four diverter channels 501 are provided, arranged in a cross pattern, and each diverter channel 501 has the aforementioned features. However, other arrangements of the diverter channels 501, such as a circumferential arrangement, are not excluded in other alternative embodiments.

[0065] It should be noted that the branch channels 501 in the embodiment of the present application are independent of each other and not connected, but in other optional examples, the branch channels 501 may also be connected to each other, so that the emissions between the branch channels 501 can be interconnected. When the flow rate of a certain branch channel 501 is large, the other branch channels 501 can play a further diversion role to facilitate the smooth discharge of emissions.

[0066] As an optional embodiment of the present application, the discharge holes 60 are spaced apart along the extension direction of the avoidance groove 50, with the flow area of ​​the discharge holes 60 being constant or gradually increasing from the distal end 5012 toward the proximal end 5011. In this embodiment of the present application, the design of the discharge holes 60 matches the design of the flow area of ​​the avoidance groove 50 to facilitate smooth discharge of the discharge.

[0067] Since both the fitting groove 70 and the avoidance groove 50 occupy the thickness of the first plate 5, certain strength requirements are imposed. In order to meet the strength requirements of the first plate 5, this application also imposes some restrictions on the dimensions of some structures.

[0068] Reference Figure 5 and Figure 6As an optional embodiment of the present application, the distance between the bottom surface of the avoidance groove 50 and the surface of the first plate 5 facing the battery cell assembly 2 is h, that is, the distance between the bottom surface of the avoidance groove 50 and the second surface 52a is h, and the thickness of the first plate 5 is t, satisfying 0.1≤h / t≤0.7. The orthographic projection area of ​​the avoidance groove 50 on the surface of the first plate 5 facing the battery cell assembly 2 is S1, that is, the projection area of ​​the avoidance groove 50 on the first surface 51a is S1, and the area of ​​the surface of the first plate 5 facing the battery cell assembly 2 is S2, that is, the area of ​​the first surface 51a is S2, satisfying 0.3≤s1 / s2≤0.9.

[0069] Several examples are provided below to verify that the numerical settings within the scope of this application can ensure the structural strength of the first plate 5. See Table 1 below for details.

[0070] Table 1

[0071]

[0072]

[0073] The table shows 30 data points divided into five groups: Group 1, 1-6; Group 2, 7-12; Group 3, 13-18; Group 4, 19-24; and Group 5, 25-30. These five groups indicate that when either h / t or S1 / S2 falls outside the numerical ranges given in this embodiment, the structural strength of the first plate 5 is at risk of fracture.

[0074] The method for testing the structural strength of the first plate 5 is: through CAE simulation, the thermal runaway gas production rate is simulated to inflate the interior of the shell 1, and it is confirmed whether different groups have cracks and damage at positions other than the explosion-proof valve 4. If cracks occur, it is judged as failure, so as to determine whether the structural strength of the first plate 5 meets the requirements.

[0075] It should be noted that in this test example, for the convenience of single comparison, the inflation rate in each housing 1 was kept the same. To ensure adequate safety performance of the first plate 5, the inflation rate used was the maximum inflation rate corresponding to the battery thermal runaway.

[0076] Among them, the method for determining whether the first plate 5 is cracked is: after inflation, use simulation software to detect the area of ​​the first plate 5 excluding the explosion-proof valve 4. During the simulation process, the software will generate a distribution diagram of stress and deformation. By checking these results, it can be determined whether the plate has reached or exceeded the yield strength of its material, thereby causing cracking.

[0077] The method for detecting t is as follows: an operator uses a vernier caliper to measure the distance between the two surfaces of the first plate 5 in the thickness direction.

[0078] The method for detecting h is as follows: the operator uses a dedicated depth measuring vernier caliper to measure the depth of the fitting groove 70 and the distance between the groove bottom surface of the avoidance groove 50 and the first surface 51a, and adds the two to obtain h.

[0079] Detection method for S1 and S2: Use image calculation software to accurately determine the corresponding area after taking the image.

[0080] In the embodiment of the present application, the depth design and area design of the avoidance groove 50 can ensure the structural strength of the first plate 5 while integrating the structure of the avoidance groove 50 to ensure the reliability of the housing 1.

[0081] It should be noted that the structure of the avoidance trough 50 can be diverse, as long as one end of the avoidance trough 50 is connected to the explosion-proof hole 500, which ensures that the emissions are eventually discharged through the explosion-proof hole 500 under the diversion effect of the avoidance trough 50.

[0082] Two other exemplary structures of the avoidance groove 50 are listed below.

[0083] Reference Figure 7 As an optional embodiment of the present application, the avoidance groove 50 includes a main groove 505 and a sub-groove 506. The main groove 505 extends along a preset direction, one end of the main groove 505 is connected to the explosion-proof hole 500, and the sub-groove 506 is connected to the main groove 505 so that the sub-groove 506 is connected to the explosion-proof hole 500 through the main groove 505.

[0084] Specifically, in the embodiment of the present application, the predetermined direction is the length direction of the battery cell assembly 2, and the extension direction of the sub-slots 506 is perpendicular to the predetermined direction, that is, the extension direction of the sub-slots 506 is the thickness direction of the battery cell assembly 2. Along the extension direction of the main slot 505, the sub-slots 506 are arranged on both sides of the main slot 505, and multiple sub-slots 506 are arranged on each side along the extension direction of the main slot 505.

[0085] In the embodiment of the present application, the main groove 505 plays a good guiding role to facilitate the orderly outflow of the emissions. The sub-groove 506 can provide a buffer area for the main groove 505 when there is a lot of emissions, thereby reducing the blockage of the main groove 505. The main groove 505 and the sub-groove 506 cooperate with each other to form a smoother emission network.

[0086] Reference Figure 8 As an optional embodiment of the present application, the avoidance groove 50 also has another form. For example, the avoidance groove 50 includes a plurality of secondary grooves 508 parallel to each other. The plurality of secondary grooves 508 extend along the length direction of the battery cell assembly 2, and each secondary groove 508 is connected to the explosion-proof hole 500.

[0087] It should be noted that, in the embodiment of the present application, the secondary slots 508 are independent of each other and are not connected to each other. However, in other optional embodiments, the secondary slots 508 may also be connected to each other.

[0088] In addition, the present application also provides a battery pack, including the battery described above.

[0089] In addition, the present application also provides an electrical device, including the battery or battery pack mentioned above.

[0090] The above description is only a partial implementation of the embodiments of the present application and does not constitute any form of limitation to the application. The protection scope of the embodiments of the present application is not limited thereto. Any simple modifications, equivalent changes and modifications that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the embodiments of the present application should be covered within the protection scope of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: The housing (1) comprises a shell (11) and a cover (12), wherein the shell (11) has an open accommodating cavity (10), and the cover (12) is arranged on the opening to close the accommodating cavity (10); A battery cell assembly (2) is disposed in the accommodating cavity (10); and An electrode terminal (3) and an explosion-proof valve (4), wherein the electrode terminal (3) is arranged on the cover (12), and the explosion-proof valve (4) is arranged on the shell (11), and the shell (11) includes a first plate (5), and the first plate (5) is provided with an explosion-proof hole (500) for installing the explosion-proof valve (4); A side of the first plate (5) facing the battery core assembly (2) is recessed and provided with an escape groove (50), and the escape groove (50) is communicated with the explosion-proof hole (500).

2. The battery according to claim 1, wherein The invention also includes a baffle (6), which is fixedly mounted on a side of the first plate (5) facing the battery core assembly (2), and is provided with a discharge hole (60) corresponding to the avoidance groove (50) and a collection hole (600) corresponding to the explosion-proof hole (500).

3. The battery according to claim 2, wherein An engaging groove (70) is formed on the peripheral edge of the first plate (5), the orthographic projection of the engaging groove (70) on the first plate (5) covers the orthographic projection of the avoidance groove (50) on the first plate (5), and the baffle (6) is engaged and fixed in the engaging groove (70).

4. The battery according to claim 3, wherein The first plate (5) includes a main body (51) and a frame (52); the main body (51) has a first surface (51a) facing the battery cell assembly (2); the main body (51) is recessed from the first surface (51a) to form the avoidance groove (50); the frame (52) is protruding from the peripheral edge of the first surface (51a); the frame (52) and the first surface (51a) are combined to form an interlocking groove (70).

5. The battery according to claim 4, wherein The frame portion (52) has a second surface (52a) facing the battery cell assembly (2), and the baffle (6) has a third surface (6a) facing the battery cell assembly (2). The third surface (6a) is located on a side of the second surface (52a) facing away from the battery cell assembly (2), or the third surface (6a) and the second surface (52a) are flush.

6. The battery according to any one of claims 2 to 5, characterized in that The avoidance groove (50) includes at least one diversion channel (501), and the diversion channel (501) is communicated with the explosion-proof hole (500); The diverter channel (501) has a proximal end (5011) close to the explosion-proof hole (500) and a distal end (5012) away from the explosion-proof hole (500), and the diverter channel (501) extends from the proximal end (5011) to the distal end (5012), and the flow area of ​​the diverter channel (501) remains unchanged or gradually increases from the distal end (5012) toward the proximal end (5011).

7. The battery according to claim 6, wherein A plurality of the diversion channels (501) are provided, and the plurality of the diversion channels (501) are arranged at intervals along the circumference of the explosion-proof hole (500).

8. The battery according to claim 6, wherein The discharge holes (60) are arranged at intervals along the extension direction of the avoidance groove (50).

9. The battery according to claim 8, wherein In the direction from the distal end (5012) toward the proximal end (5011), the flow area of ​​the discharge hole (60) remains unchanged or gradually increases.

10. The battery according to any one of claims 1 to 5, characterized in that The avoidance groove (50) comprises a main groove (505) and a sub-groove (506), wherein the main groove (505) extends along a preset direction, the main groove (505) is communicated with the explosion-proof hole (500), and the sub-groove (506) is communicated with the main groove (505) so that the sub-groove (506) is communicated with the explosion-proof hole (500) through the main groove (505).

11. The battery according to claim 10, wherein Along the extension direction of the main groove (505), the sub-grooves (506) are arranged on both sides of the main groove (505), and a plurality of the sub-grooves (506) on each side are arranged at intervals along the extension direction of the main groove (505).

12. The battery according to claim 1, wherein The orthographic projection area of ​​the avoidance groove (50) on the side of the first plate (5) facing the battery core assembly (2) is S1, and the area of ​​the side of the first plate (5) facing the battery core assembly (2) is S2, satisfying 0.3≤S1 / S2≤0.

9.

13. The battery according to claim 1, wherein The distance between the bottom surface of the avoidance groove (50) and the side of the first plate (5) facing the battery core assembly (2) is h, and the thickness of the first plate (5) is t, satisfying 0.1≤h / t≤0.

7.

14. A battery pack, characterized in that: Comprising the battery according to any one of claims 1 to 13.

Images