Battery device

Abstract

The utility model relates to the technical field of batteries, in particular to a battery device. The battery device comprises a shell, an anti-explosion valve and a battery cell assembly which is arranged in the shell, the battery cell assembly is provided with a battery cell, an adapter plate and a pole; a first surface is arranged on the side, close to the anti-explosion valve, of the switching piece, the distance d is arranged between the first surface and the anti-explosion valve, and the range of the distance d is larger than or equal to 0.5 mm and smaller than or equal to 5 mm. According to the embodiment, the anti-explosion valve is arranged on the side wall of the shell, so that the battery device can directly release pressure through the side face, the transverse space at the bottom of the chassis is exactly and effectively utilized, the chassis of the automobile is not affected, meanwhile, a longitudinal space does not need to be reserved, and the internal space of the automobile is effectively guaranteed. Moreover, a certain distance is reserved between the switching piece and the anti-explosion valve, so that an enough exhaust passage is ensured in the lateral space, and the battery device can normally release pressure.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and specifically to a battery device. Background Technology

[0002] Currently, new energy vehicles are equipped with batteries for power supply, which are typically installed at the bottom of the vehicle body. To improve battery safety, explosion-proof valves are installed on the battery casing. However, these valves are usually located on the top of the battery. Since the top of the battery is in direct contact with the vehicle chassis, the gaseous or liquid substances ejected during depressurization could potentially damage the chassis and compromise the overall safety of the vehicle.

[0003] While some explosion-proof valves are located at the bottom of the battery, allowing it to be ejected directly towards the ground during depressurization, some vehicles have an additional protective plate at the bottom. This plate, designed for depressurization, provides longitudinal space between the valve and the vehicle. However, to maintain vehicle passability, this necessitates reducing interior space, resulting in lower space utilization. Utility Model Content

[0004] In view of this, the present invention provides a battery device to solve the problems of explosion-proof valves affecting the overall safety of the vehicle when located at the top, and reducing the space utilization of the vehicle when located at the bottom.

[0005] In a first aspect, this utility model provides a battery device, which includes:

[0006] The housing has a cover on top, and the cover has a through hole.

[0007] An explosion-proof valve is disposed on one side wall of the housing;

[0008] A battery cell assembly is disposed in the housing; the battery cell assembly includes a battery cell, an adapter plate, and a terminal post.

[0009] At least one tab of the battery cell is positioned facing the explosion-proof valve; one end of the adapter plate is connected to the tab, and the other end of the adapter plate extends toward the cover; one end of the pole is connected to the other end of the adapter plate, and the other end of the pole extends outward from the through hole and is connected to the cover.

[0010] The adapter plate has a first surface on the side near the explosion-proof valve, and a distance d is provided between the first surface and the explosion-proof valve, wherein the distance d is in the range of 0.5mm≤d≤5mm.

[0011] Beneficial Effects: In this embodiment, the explosion-proof valve is located on the side wall of the housing, allowing the battery device to release pressure directly from the side. This effectively utilizes the lateral space at the bottom of the chassis, thus ensuring the vehicle's interior space without affecting the chassis or requiring longitudinal space. Furthermore, a certain distance is maintained between the adapter plate and the explosion-proof valve to ensure sufficient venting channels in the lateral space, allowing the battery device to release pressure normally. Moreover, the adapter plate not only provides conductivity for the terminals and tabs but also restricts the overall position of the battery cell assembly within the housing, ensuring stable installation and proper operation of the battery device. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of the battery device in an embodiment of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the shell in an embodiment of this utility model;

[0015] Figure 3 This is a partial schematic diagram of the battery cell assembly in an embodiment of this utility model;

[0016] Figure 4 for Figure 3 Side view;

[0017] Figure 5 This is a schematic diagram showing the connection of the pole post, adapter plate, and pole tab in an embodiment of this utility model;

[0018] Figure 6 This is a schematic diagram of the structure of the adapter piece in an embodiment of this utility model;

[0019] Figure 7 This is a schematic diagram of the structure of a single battery cell in an embodiment of this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Housing; 2. Cover; 3. Explosion-proof valve; 4. Battery cell assembly; 41. Battery cell; 411. Electrode; 412. Bending part; 413. Slot; 42. Adapter piece; 421. First connecting part; 422. Transition part; 423. Second connecting part; 43. Terminal post. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0025] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] Currently, new energy vehicles are equipped with batteries for power supply, typically mounted at the bottom of the vehicle. To improve battery safety, explosion-proof valves are installed on the battery casing. However, these valves are usually located on top of the battery, which is in direct contact with the vehicle chassis. During depressurization, the ejected gaseous or liquid substances could potentially damage the chassis, affecting the overall safety of the vehicle. While some explosion-proof valves are located at the bottom of the battery, allowing it to be ejected directly towards the ground during depressurization, some vehicles have an additional protective plate at the bottom, providing longitudinal space between the plate and the explosion-proof valve for depressurization. However, maintaining vehicle passability necessitates reducing interior space, resulting in lower space utilization.

[0027] In view of this, the present invention provides a battery device to solve the problems of explosion-proof valves affecting the overall safety of the vehicle when located at the top, and reducing the space utilization of the vehicle when located at the bottom.

[0028] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0029] According to an embodiment of the present invention, a battery device is provided, which includes a housing 1, an explosion-proof valve 3, and a battery cell assembly 4.

[0030] Specifically, in this embodiment, a cover 2 is provided on the top of the housing 1, and a receiving cavity is provided inside the housing 1. A through hole is formed on the cover 2. Normally, the housing 1 has a rectangular structure. Compared to the conventional placement of the explosion-proof valve 3 at the top and bottom of the housing 1, in this embodiment, as... Figures 1 to 5 As shown, the explosion-proof valve 3 is disposed on one side wall of the housing 1. Of course, this embodiment does not limit the number of explosion-proof valves 3; one or more can be provided. Those skilled in the art can adjust the number according to actual conditions, as long as the same technical effect is achieved. In this embodiment, a single explosion-proof valve 3 is used as an example.

[0031] Furthermore, in this embodiment, the battery cell assembly 4 is disposed in the housing 1, and the battery cell assembly 4 includes a battery cell 41, an adapter plate 42, and a terminal post 43. This embodiment does not limit the number of battery cells 41; one, two, three, etc., can be used. Those skilled in the art can adjust the number according to actual conditions, as long as the same technical effect is achieved.

[0032] Specifically, the battery cell 41 is provided with a positive tab and a negative tab, and at least one tab 411 of the battery cell 41 is arranged facing the side of the explosion-proof valve 3. That is, one of the positive and negative tabs may be arranged facing the side of the explosion-proof valve 3, or both the positive and negative tabs may be arranged facing the explosion-proof valve 3. Those skilled in the art can make adjustments according to the actual situation, and this embodiment is not limited thereto.

[0033] Furthermore, one end of the adapter plate 42 is connected to the tab 411, and the other end of the adapter plate 42 extends toward the cover 2. One end of the pole post 43 is connected to the other end of the adapter plate 42, and the other end of the pole post 43 extends outward from the through hole and is connected to the cover 2. In this embodiment, the adapter plate 42 can conduct electricity for both the pole post 43 and the tab 411, and since the adapter plate 42 connects both the pole post 43 and the tab 411, it can also fix the battery cell assembly 4. Therefore, there is no need to separately set up a structural component specifically for fixing the battery cell assembly 4 inside the housing 1, which optimizes the space utilization within the housing 1.

[0034] Furthermore, in this embodiment, the adapter plate 42 has a first surface on the side near the explosion-proof valve 3, such as... Figures 3 to 5 As shown, a distance d is provided between the first surface and the explosion-proof valve 3, so that a certain exhaust channel is formed inside the housing 1, and the distance d is in the range of 0.5mm≤d≤5mm.

[0035] For example, the distance d can be selected from specific values ​​such as 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm. Of course, this embodiment is merely an example of the value of distance d, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect is achieved.

[0036] With this configuration, the explosion-proof valve 3 is placed on the side wall of the housing 1, allowing the battery device to be depressurized directly from the side. This effectively utilizes the lateral space at the bottom of the chassis, ensuring that the vehicle's interior space is not affected and that no longitudinal space is required. Furthermore, a certain distance is maintained between the adapter plate 42 and the explosion-proof valve 3 to ensure sufficient venting channels in the lateral space, allowing the battery device to depressurize normally. Moreover, the adapter plate 42 not only provides conductivity for the terminals 43 and tabs 411 but also restricts the overall position of the cell assembly 4 within the housing 1, ensuring that the cell assembly 4 can be stably installed in the housing 1, thereby enabling the battery device to operate normally.

[0037] Further, in an optional embodiment, the terminal post 43 is disposed on the top of the battery cell 41, and the tab 411 is disposed on one side of the battery cell 41, with the terminal post 43 and the tab 411 correspondingly disposed, as shown below. Figure 6 As shown, the adapter piece 42 is arranged in an L-shape.

[0038] In this embodiment, since the battery cell 41 is typically rectangular, when the adapter piece 42 is fully fitted to the outer surface of the battery cell 41, it will form an L-shape. This fully utilizes the space between the adapter piece 42 and the battery cell 41 while ensuring complete contact between them. During installation or use, there will be no positional misalignment between the adapter piece 42 and the battery cell 41.

[0039] Of course, this embodiment does not limit the material of the adapter piece 42. Those skilled in the art can make changes according to the actual situation, as long as it has a certain structural strength and good conductivity.

[0040] In this embodiment, the adapter piece 42 is configured as an L-shaped structure. Compared to other types of structures, the L-shaped structure better matches the rectangular structure of the battery cell 41 itself, thereby ensuring that the battery cell assembly 4 can be stably installed in the housing 1. Simultaneously, since the terminal post 43 and the tab 411 are correspondingly arranged, the overall length of the adapter piece 42 is relatively short, which can reduce power loss between the tab 411 and the terminal post 43 to a certain extent. Furthermore, the shorter overall length of the adapter piece 42 also improves the overall structural strength of the adapter piece 42, thereby further enhancing the stability of the battery cell assembly 4 in the housing 1.

[0041] Furthermore, in an alternative implementation, such as Figure 7 As shown, the tab 411 has a bent portion 412, which, together with the battery cell 41, forms a slot 413 suitable for inserting the adapter piece 42. The adapter piece 42 can be inserted into the slot 413 before being soldered to the tab 411, thereby fixing the adapter piece 42 to the tab 411. The distance d is within the range of 1mm ≤ d ≤ 5mm.

[0042] Of course, multiple through holes can also be provided on the tab 411, and the through holes can penetrate the slot 413. The adapter piece 42 and the tab 411 can also be welded to the through holes to further enhance the connection stability between the adapter piece 42 and the tab 411.

[0043] In this embodiment, the distance d can be selected from specific values ​​such as 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm. Of course, this embodiment is merely an example of the value of distance d, and does not limit it. Those skilled in the art can change it according to the actual situation, as long as the same technical effect is achieved.

[0044] In this configuration, the adapter piece 42 is placed inside the tab 411, and then the adapter piece 42 is welded to the tab 411. Since the bent portion 412 and the battery cell 41 surround and form a slot 413, the positions of the adapter piece 42 and the tab 411 can be effectively fixed, thereby improving the stability of the battery cell assembly 4 within the housing 1. Simultaneously, because the adapter piece 42 is located inside the tab 411, the range of distance d can be controlled to ensure normal ventilation of the exhaust channel.

[0045] Furthermore, in an optional embodiment, the adapter plate 42 and the explosion-proof valve 3 do not coincide on the projection of the plane containing the first surface; the distance d is in the range of 1mm≤d≤5mm.

[0046] In this embodiment, the distance d can be selected from specific values ​​such as 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm. Of course, this embodiment is merely an example of the value of distance d, and does not limit it. Those skilled in the art can change it according to the actual situation, as long as the same technical effect is achieved.

[0047] With this configuration, the adapter plate 42 and the explosion-proof valve 3 are offset from each other in this embodiment, and they do not overlap, which can reduce the impact of the adapter plate 42 on the exhaust channel. At the same time, the distance between the adapter plate 42 and the explosion-proof valve 3 can be further reduced, so that the exhaust channel can exhaust normally while reducing the overall volume of the housing 1 and improving the space utilization of the battery device.

[0048] Furthermore, in an alternative implementation, such as Figures 3 to 5 As shown, on the projection of the plane containing the first surface, the adapter plate 42 and the explosion-proof valve 3 partially overlap; the distance d is in the range of 1.5mm≤d≤5mm.

[0049] In this embodiment, the distance d can be selected from specific values ​​such as 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm. Of course, this embodiment is merely an example of the value of distance d, and does not limit it. Those skilled in the art can change it according to the actual situation, as long as the same technical effect is achieved.

[0050] With this configuration, the adapter plate 42 and the explosion-proof valve 3 partially overlap in this embodiment, making the connection between the adapter plate 42 and the battery cell assembly 4 more stable. Furthermore, the connection area between the adapter plate 42 and the electrode 411 can be appropriately increased, thereby increasing the current-carrying capacity at the welding position and also enhancing the heat dissipation capacity of the adapter plate 42. Simultaneously, the distance between the adapter plate 42 and the explosion-proof valve 3 can be further controlled, ensuring proper exhaust through the exhaust channel.

[0051] Furthermore, in an optional embodiment, the adapter plate 42 and the explosion-proof valve 3 are completely overlapped on the projection of the plane containing the first surface; the distance d is in the range of 2mm≤d≤5mm.

[0052] In this embodiment, the distance d can be selected from specific values ​​such as 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm. Of course, this embodiment is merely an example of the value of distance d, and does not impose any limitations on it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0053] With this configuration, the adapter plate 42 and the explosion-proof valve 3 are completely overlapped, maximizing the stable connection between the adapter plate 42 and the battery cell assembly 4. Simultaneously, it also maximizes the heat dissipation capacity of the adapter plate 42. Therefore, the distance between the adapter plate 42 and the explosion-proof valve 3 needs to be appropriately increased to ensure proper exhaust flow through the exhaust channel.

[0054] Furthermore, in an optional embodiment, the tab 411 is formed with a bent portion 412, the end face of the bent portion 412 away from the battery cell 41 is connected to the adapter piece 42; the distance d is in the range of 0.5mm≤d≤4mm.

[0055] In this embodiment, the distance d can be selected from specific values ​​such as 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, and 4mm. Of course, this embodiment is merely an example of the value of distance d, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect is achieved.

[0056] With this configuration, the adapter plate 42 is connected to the outer side of the electrode 411 in this embodiment, which effectively fixes the positions of the adapter plate 42 and the electrode 411, thereby improving the stability of the battery cell assembly 4 in the housing 1. At the same time, since the adapter plate 42 is located outside the electrode 411, it avoids direct damage to the battery cell 41 when the adapter plate 42 experiences overcurrent. Furthermore, in this configuration, the distance between the adapter plate 42 and the explosion-proof valve 3 is closer; therefore, the range of distance d needs to be appropriately controlled to ensure normal ventilation of the exhaust channel.

[0057] Furthermore, in an optional embodiment, the adapter plate 42 and the explosion-proof valve 3 do not coincide on the projection of the plane containing the first surface; the distance d is in the range of 0.5mm≤d≤4mm.

[0058] In this embodiment, the distance d can be selected from specific values ​​such as 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, and 4mm. Of course, this embodiment is merely an example of the value of distance d, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect is achieved.

[0059] Furthermore, in an optional embodiment, the adapter plate 42 and the explosion-proof valve 3 partially overlap on the projection of the plane containing the first surface; the distance d is in the range of 0.7mm≤d≤4mm.

[0060] In this embodiment, the distance d can be selected from specific values ​​such as 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, and 4mm. Of course, this embodiment is merely an example of the value of distance d, and does not limit it. Those skilled in the art can change it according to the actual situation, as long as the same technical effect is achieved.

[0061] Furthermore, in an optional embodiment, the adapter plate 42 and the explosion-proof valve 3 are completely overlapped on the projection of the plane containing the first surface; the distance d is in the range of 1mm≤d≤4mm.

[0062] In this embodiment, the distance d can be selected from specific values ​​such as 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, and 4mm. Of course, this embodiment is merely an example of the value of distance d, and does not limit it. Those skilled in the art can change it according to the actual situation, as long as the same technical effect is achieved.

[0063] Furthermore, in an optional embodiment, the battery cell 41 is provided with a positive tab and a negative tab, both of which are located on the same side of the battery cell 41.

[0064] Furthermore, in an optional embodiment, the battery cell 41 is provided with a positive tab and a negative tab, which are disposed on two opposite sides of the battery cell 41.

[0065] Furthermore, in an optional embodiment, the battery cell 41 is a laminated battery cell 41 or a wound battery cell 41.

[0066] Further, in an optional embodiment, the battery cell assembly 4 is provided with at least two battery cells 41, and at least one tab 411 of each battery cell 41 is positioned facing the explosion-proof valve 3. One end of the adapter plate 42 is connected to the tab 411 of each battery cell 41, and the other end of the adapter plate 42 extends toward the cover 2. One end of the pole post 43 is connected to the other end of the adapter plate 42, and the other end of the pole post 43 extends outward from the through hole and is connected to the cover 2. That is, this embodiment only provides one pole post 43 and one adapter plate 42, and the adapter plate 42 simultaneously fixes all the battery cells 41 inside the housing 1.

[0067] like Figure 2 As shown, this embodiment has two battery cells 41, and the adapter piece 42 fixes both battery cells 41 at the same time.

[0068] Of course, this embodiment is merely an example of the number of battery cells 41 inside the casing 1, but it is not a limitation. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0069] Furthermore, in an alternative implementation, such as Figure 6 As shown, the adapter plate 42 includes a first connecting portion 421, a transition portion 422, and a second connecting portion 423 connected in sequence. The first connecting portion 421 is connected to the pole post 43, and the second connecting portion 423 is connected to the tab 411. In the extending direction of the adapter plate 42, the width of the transition portion 422 is smaller than that of the first connecting portion 421 and the second connecting portion 423. When the current value passing through the adapter plate 42 is greater than a predetermined current value, the transition portion 422 disconnects.

[0070] In other words, the transition portion 422 in this embodiment acts as a fuse. Therefore, by providing the transition portion 422 on the adapter piece 42, this embodiment can directly burn out the transition portion 422 when the current value of the adapter piece 42 is large, thereby protecting the battery device. Thus, the transition portion 422 simultaneously has the functions of fixing, conducting electricity, and protecting.

[0071] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery device, characterized in that, include: The housing (1) has a cover (2) on the top, and the cover (2) has a through hole; An explosion-proof valve (3) is disposed on one side wall of the housing (1); A battery cell assembly (4) is disposed in the housing (1); the battery cell assembly (4) is provided with a battery cell (41), an adapter plate (42) and a terminal post (43); At least one tab (411) of the battery cell (41) is disposed facing the side of the explosion-proof valve (3); one end of the adapter plate (42) is connected to the tab (411), and the other end of the adapter plate (42) extends toward the cover (2); one end of the pole (43) is connected to the other end of the adapter plate (42), and the other end of the pole (43) extends outward from the through hole and is connected to the cover (2); The adapter plate (42) has a first surface on the side near the explosion-proof valve (3), and a distance d is provided between the first surface and the explosion-proof valve (3), the distance d being in the range of 0.5mm≤d≤5mm.

2. The battery device according to claim 1, characterized in that, The pole post (43) is disposed on the top of the battery cell (41), and the tab (411) is disposed on one side of the battery cell (41). The pole post (43) and the tab (411) are disposed correspondingly, so that the adapter piece (42) has an L-shaped structure.

3. The battery device according to claim 1 or 2, characterized in that, The tab (411) has a bent portion (412), which, together with the battery cell (41), forms a slot (413) suitable for the insertion of the adapter piece (42); the distance d is in the range of 1mm≤d≤5mm.

4. The battery device according to claim 3, characterized in that, On the projection of the plane containing the first surface, the adapter plate (42) does not coincide with the explosion-proof valve (3); the distance d is in the range of 1mm≤d≤5mm.

5. The battery device according to claim 3, characterized in that, On the projection of the plane containing the first surface, the adapter piece (42) and the explosion-proof valve (3) partially overlap; the distance d is in the range of 1.5mm≤d≤5mm.

6. The battery device according to claim 3, characterized in that, On the projection of the plane containing the first surface, the adapter plate (42) and the explosion-proof valve (3) are completely coincident; the distance d is in the range of 2mm≤d≤5mm.

7. The battery device according to claim 1 or 2, characterized in that, The tab (411) has a bent portion (412), and the end face of the bent portion (412) away from the cell (41) is connected to the adapter piece (42); the distance d is in the range of 0.5mm≤d≤4mm.

8. The battery device according to claim 7, characterized in that, On the projection of the plane containing the first surface, the adapter piece (42) does not coincide with the explosion-proof valve (3); the distance d is in the range of 0.5mm≤d≤4mm.

9. The battery device according to claim 7, characterized in that, On the projection of the plane containing the first surface, the adapter piece (42) and the explosion-proof valve (3) partially overlap; the distance d is in the range of 0.7mm≤d≤4mm.

10. The battery device according to claim 7, characterized in that, On the projection of the plane containing the first surface, the adapter piece (42) and the explosion-proof valve (3) are completely coincident; the distance d is in the range of 1mm≤d≤4mm.

11. The battery device according to claim 1 or 2, characterized in that, The battery cell (41) is provided with a positive tab and a negative tab, both of which are located on the same side of the battery cell (41).

12. The battery device according to claim 1 or 2, characterized in that, The battery cell (41) is provided with a positive electrode and a negative electrode, which are located on two opposite sides of the battery cell (41).

13. The battery device according to claim 1 or 2, characterized in that, The battery cell (41) is a laminated battery cell (41) or a wound battery cell (41).

14. The battery device according to claim 1 or 2, characterized in that, The battery cell assembly (4) is provided with at least two battery cells (41), and at least one tab (411) of each battery cell (41) is arranged facing the explosion-proof valve (3); one end of the adapter plate (42) is connected to the tab (411) of each battery cell (41), and the other end of the adapter plate (42) extends toward the cover (2); one end of the pole (43) is connected to the other end of the adapter plate (42), and the other end of the pole (43) extends outward from the through hole and is connected to the cover (2).

15. The battery device according to claim 1 or 2, characterized in that, The adapter plate (42) includes a first connecting part (421), a transition part (422), and a second connecting part (423) connected in sequence. The first connecting part (421) is connected to the pole post (43), and the second connecting part (423) is connected to the tab (411). In the extending direction of the adapter plate (42), the width of the transition part (422) is smaller than that of the first connecting part (421) and the second connecting part (423). When the current value passing through the adapter plate (42) is greater than a predetermined current value, the transition part (422) is disconnected.

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