Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a box body. The battery pack also comprises a single battery which is accommodated in the box body. Each single battery comprises a shell, a cover body and a battery cell, the cover body covers the shell, and the cover body and the shell are matched to define a cavity for accommodating the battery cell; the cover body is provided with a pole. The battery pack further comprises a protection part which is accommodated in the box body. The protection part comprises a base body and a protection rib, the base body is located on one side, back to the battery core, of the cover body, and the protection rib is convexly arranged on one side, facing the cover body, of the base body; the end part, far away from the base body, of the protective rib is provided with an abutting part, and the orthographic projection of the abutting part on the cover body is separated from the pole. Through the mode, the safety performance of the battery pack can be improved, and the pole columns of the single batteries can be effectively protected.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery pack. Background Art

[0002] With the rapid development of power batteries, the requirements for the safety performance of battery packs are getting higher and higher. Traditional battery packs usually set up protective structures to ensure the safety of the single cells inside the battery pack. When the battery pack is subjected to external force impact, the existing protective structure is likely to directly contact the pole column of the single cell under the action of the impact force, resulting in the pole column being easily damaged by extrusion and impact, increasing the risk of safety problems such as fire and explosion of the single cell. Summary of the Utility Model

[0003] This application provides a battery pack, which can improve the safety performance of the battery pack and can effectively protect the pole column of the single cell.

[0004] This application provides a battery pack. The battery pack includes a box body. The battery pack further includes single cells, and the single cells are accommodated in the box body. Each single cell includes a housing, a cover body, and an electric core. The cover body covers the housing, and the cover body and the housing cooperate to enclose a cavity for accommodating the electric core; the cover body has a pole column. The battery pack further includes a protective member, and the protective member is accommodated in the box body. The protective member includes a base body and protective ribs. The base body is located on the side of the cover body facing away from the electric core, and the protective ribs protrude from the side of the base body facing the cover body; the end of the protective rib away from the base body has an abutting portion, and the orthographic projection of the abutting portion on the cover body is spaced apart from the pole column.

[0005] In an embodiment of this application, the cover body further includes an explosion-proof valve, and the orthographic projection of the abutting portion on the cover body is spaced apart from the explosion-proof valve.

[0006] In an embodiment of this application, the cover body further includes an explosion-proof valve, and the explosion-proof valve is spaced apart from the pole column; the protective member further includes a flexible buffer body, and the flexible buffer body and the protective ribs protrude from the same side of the base body. The flexible buffer body is used for flexibly supporting the cover body, and the orthographic projection of the flexible buffer body on the cover body overlaps with the pole column and / or the explosion-proof valve.

[0007] In an embodiment of this application, the flexible buffer body includes a first flexible buffer body and a second flexible buffer body. The first flexible buffer body and the second flexible buffer body are spaced apart from each other. The orthographic projection of the first flexible buffer body on the cover body overlaps with the pole column and is spaced apart from the explosion-proof valve, and the orthographic projection of the second flexible buffer body on the cover body overlaps with the explosion-proof valve and is spaced apart from the pole column.

[0008] In an embodiment of this application, the protective rib further has a connecting portion, and the abutting portion is connected to the base body through the connecting portion; wherein, a thinning groove is provided on the connecting portion, and the thickness of the connecting portion at the position where the thinning groove is located is less than the thickness of the rest of the connecting portion.

[0009] In one embodiment of the present application, the battery pack has a first direction, and the single battery and the protective member are arranged opposite to each other along the first direction; wherein, in the first direction, the thinning groove is located in the middle of the connecting portion.

[0010] In an embodiment of the present application, there are multiple protective ribs, and the abutting portions of the protective ribs are spaced apart from each other.

[0011] In one embodiment of the present application, the battery pack has a second direction; there are multiple protective ribs, and each protective rib is distributed along the second direction; the protective rib also has a connecting portion, and the abutting portion is connected to the base through the connecting portion; the connecting portion is inclined relative to the second direction; and the abutting portion extends along the second direction.

[0012] In one embodiment of the present application, the battery pack has a first direction, and the single battery and the protective member are arranged opposite to each other along the first direction; the protective rib also has a connecting portion, and the abutting portion is connected to the base through the connecting portion, wherein the connecting portion is bent and extended along the first direction.

[0013] In one embodiment of the present application, the protective member further includes a carrier, the carrier and the protective rib are protrudingly disposed on the same side of the base, and the single battery is supported by the carrier.

[0014] In one embodiment of the present application, the box body includes a box body and a bottom guard plate, the bottom guard plate covers the bottom of the box body, and the box body and the bottom guard plate cooperate to enclose a cavity for accommodating single cells and protective components; wherein the protective components are located between the single cells and the bottom guard plate.

[0015] The beneficial effects of the present application are as follows: Different from the prior art, the present application provides a battery pack. The battery pack can effectively protect the single battery by arranging a protective piece inside the box, and avoid the single battery from being damaged by external force impact as much as possible, thereby reducing the risk of safety problems such as fire and explosion of the single battery, thereby improving the safety performance of the battery pack.

[0016] Furthermore, the protective part includes a base and a protective rib, and the abutment portion of the protective rib is spaced from the pole in its orthographic projection on the cover body, that is, the abutment portion of the protective rib avoids the pole of the single cell, so as to avoid the impact force directly acting on the pole through the protective rib as much as possible when the battery pack is impacted by external force. The pole of the single cell can be effectively protected, and the risk of safety problems such as fire and explosion of the single cell can be further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of an embodiment of a battery pack of the present application;

[0019] Figure 2 is a schematic structural diagram of an embodiment of a single battery of the present application;

[0020] Figure 3 is Figure 2 a schematic explosion structural diagram of the single battery shown;

[0021] Figure 4 is a schematic structural diagram of an embodiment of a single battery and a protective member of the present application;

[0022] Figure 5 is a schematic structural diagram of a first embodiment of a protective member of the present application;

[0023] Figure 6 is Figure 5 a schematic structural diagram of area A of the protective member shown;

[0024] Figure 7 is a schematic structural diagram of a second embodiment of a protective member of the present application;

[0025] Figure 8 is a schematic structural diagram of a third embodiment of a protective member of the present application;

[0026] Figure 9 is a schematic structural diagram of a fourth embodiment of a protective member of the present application.

[0027] Explanation of reference numerals:

[0028] 10 Battery pack; 11 Box body; 111 Box main body; 112 Bottom guard plate; 12 Single battery; 121 Shell; 122 Cover body; 1221 Terminal; 1222 Explosion-proof valve; 123 Battery cell; 13 Protective member; 131 Substrate; 132 Protective rib; 1321 Contact part; 1322 Connection part; 1323 Thinning groove; 133 Flexible buffer body; 1331 First flexible buffer body; 1332 Second flexible buffer body; 134 Carrier. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the orientation words such as "upper", "lower", "left", and "right" generally refer to the upper, lower, left, and right in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings.

[0030] In the present application, unless otherwise clearly defined and limited, terms such as "connected", "coupled", "stacked", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0031] The present application provides a battery pack, which will be described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. And in the following embodiments, each embodiment is described with emphasis. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0032] To solve the technical problem of poor safety performance of the battery pack in the prior art, an embodiment of the present application provides a battery pack. The battery pack includes a box body. The battery pack further includes a single cell, and the single cell is accommodated in the box body. The single cell includes a housing, a cover body, and an electrode core. The cover body covers the housing, and the cover body and the housing cooperate to enclose a cavity for accommodating the electrode core; the cover body has a pole column. The battery pack further includes a protection member, and the protection member is accommodated in the box body. The protection member includes a base body and protection ribs. The base body is located on the side of the cover body facing away from the electrode core, and the protection ribs protrude from the side of the base body facing the cover body; the end of the protection rib away from the base body has an abutting portion, and the orthographic projection of the abutting portion on the cover body is spaced from the pole column. The following will be elaborated in detail.

[0033] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an embodiment of the battery pack of the present application.

[0034] In one embodiment, the battery pack 10 includes a box 11 and a plurality of single cells 12, and the plurality of single cells 12 are accommodated in the box 11. The single cells 12 include but are not limited to lithium ion secondary batteries, lithium ion primary batteries, lithium sulfur batteries, sodium lithium ion batteries, sodium ion batteries or magnesium ion batteries, etc., which are not limited in the embodiments of the present disclosure. The battery pack 10 is a power supply for an electrical device. The electrical device may be a mobile phone, a portable device, a laptop computer, a battery car, an electric car, a ship, a spacecraft, an electric toy and an electric tool. For example, a spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft; an electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy; an electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer.

[0035] For details, please refer to Figure 2 and Figure 3 The single battery 12 includes a shell 121, a cover 122 and a battery cell 123. The cover 122 covers the shell 121, and the cover 122 and the shell 121 cooperate to enclose a cavity for accommodating the battery cell 123. The battery cell 123 is formed by stacking or winding pole pieces and diaphragms. The cover 122 has a pole 1221 and an explosion-proof valve 1222, and the explosion-proof valve 1222 and the pole 1221 are spaced apart from each other. The pole 1221 is electrically connected to the battery cell 123.

[0036] The battery pack 10 further includes a protective member 13, which is accommodated in the box body 11. When the battery pack 10 is impacted by an external force, the protective member 13 is used to prevent the impact force from directly acting on the single battery 12, and can effectively protect the single battery 12, and avoid the single battery 12 from being damaged by the external force impact as much as possible, thereby reducing the risk of safety problems such as fire and explosion of the single battery 12, thereby improving the safety performance of the battery pack 10.

[0037] It should be noted that in a traditional battery pack, the poles and explosion-proof valves of the single cells are arranged facing the upper cover of the box body. In the top trampling condition of the battery pack, the top of the battery pack will be subjected to external force impact, and there is a risk of damage to the poles and explosion-proof valves of the single cells. Therefore, in some designs, the single cells can be inverted, that is, the poles and explosion-proof valves of the single cells face the bottom of the box body. During the design process of the battery pack, it is necessary to evaluate the impact of the bottom ball impact condition on the safety of the battery pack, and it is necessary to ensure that the bottom ball impact condition will not cause too much deformation to the single cells, cannot damage the function of the explosion-proof valves, and it is necessary to ensure that the battery pack can continue to be used temporarily to facilitate the user to send it for maintenance; for the top trampling condition, it is necessary to ensure the safety of the personnel above the battery pack. Excessive force on the poles of the single cells and damage to the function of the explosion-proof valves may pose a threat to the safety of nearby personnel.

[0038] In the embodiment of the present application, the poles 1221 and the explosion-proof valves 1222 of the single cell 12 can be arranged facing the top or the bottom of the box body 11. Hereinafter, taking the poles 1221 and the explosion-proof valves 1222 of the single cell 12 facing the bottom of the box body 11 as an example for illustration, that is, the single cell 12 is inverted, which is only for the need of discussion and is not limited thereby. Specifically, the box body 11 includes a box main body 111 and a bottom guard plate 112. The bottom guard plate 112 covers the bottom of the box main body 111. The box main body 111 and the bottom guard plate 112 cooperate to enclose a cavity for accommodating the single cell 12 and the protection member 13. Considering that the bottom of the box body 11 may also be subjected to external force impact, such as the bottom ball impact condition, etc., therefore, in the embodiment of the present application, the protection member 13 is located between the single cell 12 and the bottom guard plate 112 to avoid the impact force directly acting on the single cell 12 when the bottom of the box body 11 is subjected to external force impact, and can effectively protect the single cell 12, thereby improving the safety performance of the battery pack 10.

[0039] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of an embodiment of the single cell and the protection member of the present application. Hereinafter, the protection member 13 of the embodiment of the present application will be described.

[0040] In one embodiment, the protection member 13 includes a base body 131 and protection ribs 132. The base body 131 is located on the side of the cover body 122 of the single cell 12 facing away from the battery core 123, and the protection ribs 132 protrude from the side of the base body 131 facing the cover body 122. The end of the protection rib 132 away from the base body 131 has an abutting portion 1321, and the abutting portion 1321 is used for abutting against the cover body 122, wherein the orthographic projection of the abutting portion 1321 on the cover body 122 is spaced apart from the pole 1221.

[0041] In the above manner, the orthographic projection of the abutting portion 1321 of the protective rib 132 on the cover body 122 is spaced apart from the pole column 1221, that is, the abutting portion 1321 of the protective rib 132 avoids the pole column 1221 of the single cell 12. When the battery pack 10 is subjected to an external impact, the abutting portion 1321 of the protective rib 132 abuts against other non-critical parts of the cover body 122 except the pole column 1221, and as much as possible, the impact force is prevented from directly acting on the pole column 1221 through the protective rib 132, so that the pole column 1221 of the single cell 12 can be effectively protected, and the risk of safety problems such as fire and explosion of the single cell 12 is further reduced.

[0042] Furthermore, the orthographic projection of the abutting portion 1321 of the protective rib 132 on the cover body 122 is also spaced apart from the explosion-proof valve 1222, that is, the abutting portion 1321 of the protective rib 132 also avoids the explosion-proof valve 1222 of the single cell 12. When the battery pack 10 is subjected to an external impact, the abutting portion 1321 of the protective rib 132 abuts against other non-critical parts of the cover body 122 except the pole column 1221 and the explosion-proof valve 1222, and as much as possible, the impact force is prevented from directly acting on the pole column 1221 and the explosion-proof valve 1222 through the protective rib 132, so that the pole column 1221 and the explosion-proof valve 1222 of the single cell 12 can be effectively protected, and the risk of safety problems such as fire and explosion of the single cell 12 is further reduced.

[0043] It should be noted that considering that there is an electrical connection for the pole column 1221 of the single cell 12, the risk of safety problems caused by damage to the pole column 1221 is higher than that of the explosion-proof valve 1222. Therefore, in other embodiments of the present application, only the abutting portion 1321 of the protective rib 132 may be arranged to avoid the pole column 1221. At this time, the orthographic projection of the abutting portion 1321 on the cover body 122 overlaps with the explosion-proof valve 1222. In this case, the risk of safety problems such as fire and explosion of the single cell 12 can be greatly reduced. And when the battery pack 10 is not subjected to an external impact, the abutting portion 1321 of the protective rib 132 may be spaced apart from the cover body 122, or the abutting portion 1321 may be in contact with the cover body 122, which is not limited herein. The protective rib 132 may be made of a plastic material such as PU (polyurethane). The protective rib 132 has the advantages of light weight, low cost, easy deformation and energy absorption, etc. The protective rib 132 effectively buffers the impact force by virtue of its characteristic of deforming and absorbing energy, and further reduces the risk of safety problems of the single cell 12.

[0044] In one embodiment, the battery pack 10 has a first direction Z and a second direction X that are perpendicular to each other. The single cell 12 and the protective member 13 are disposed opposite to each other along the first direction Z. The number of the protective ribs 132 is multiple, and each protective rib 132 is distributed along the second direction X. The abutting portions 1321 of the respective protective ribs 132 are spaced apart from each other, which can further reduce the risk of interference between the abutting portion 1321 and key parts such as the pole post 1221 and the explosion-proof valve 1222 under the action of an impact force, and further reduce the risk of safety problems occurring in the single cell 12.

[0045] In one embodiment, the protective member 13 further includes a flexible buffer 133. The flexible buffer 133 and the protective ribs 132 protrude from the same side of the base body 131, and the flexible buffer 133 is used to flexibly support the cover body 122. Wherein, the orthographic projection of the flexible buffer 133 on the cover body 122 overlaps with the pole post 1221 and / or the explosion-proof valve 1222.

[0046] In the above manner, when the battery pack 10 is subjected to an external impact force, the flexible buffer 133 contacts the pole post 1221 and / or the explosion-proof valve 1222, and the flexible buffer 133 can deform to effectively buffer the impact force, further effectively protecting the pole post 1221 and / or the explosion-proof valve 1222 of the single cell 12, and reducing the risk of safety problems such as fire and explosion occurring in the single cell 12. Moreover, the texture of the flexible buffer 133 is relatively soft, and even if the flexible buffer 133 contacts the pole post 1221 and / or the explosion-proof valve 1222, it will not cause damage to the pole post 1221 and / or the explosion-proof valve 1222.

[0047] For example, the flexible buffer 133 includes a first flexible buffer 1331 and a second flexible buffer 1332. The first flexible buffer 1331 and the second flexible buffer 1332 are spaced apart from each other. The orthographic projection of the first flexible buffer 1331 on the cover body 122 overlaps with the pole post 1221 and is spaced apart from the explosion-proof valve 1222. The orthographic projection of the second flexible buffer 1332 on the cover body 122 overlaps with the explosion-proof valve 1222 and is spaced apart from the pole post 1221. The end face of the first flexible buffer 1331 facing away from the base body 131 is disposed close to the pole post 1221. Specifically, a bus bar may be interposed between the first flexible buffer 1331 and the pole post 1221. The second flexible buffer 1332 is spaced apart from the explosion-proof valve 1222, so that there is a gap between the second flexible buffer 1332 and the explosion-proof valve 1222, so that the high-temperature and high-pressure gas inside the single cell 12 can be normally discharged through this gap when the explosion-proof valve 1222 is opened, avoiding affecting the function realization of the explosion-proof valve 1222.

[0048] Figure 4Exemplarily, first flexible buffer bodies 1331 are respectively arranged on both sides of the second flexible buffer body 1332 in the second direction X. Two protective ribs 132 are arranged between each first flexible buffer body 1331 and the second flexible buffer body 1332. The protective ribs 132 are arranged obliquely relative to the second direction X, so that the protective ribs 132 are more likely to bend under an external impact to effectively buffer the impact force, and further reduce the risk of safety problems occurring in the single battery 12.

[0049] Optionally, the flexible buffer body 133 can be a foam or the like, and its material can be melamine, EPP (Expanded polypropylene, polypropylene plastic foaming material), MPPE (Modified Polypheylene ether, modified polyphenylene ether), etc. The flexible buffer body 133 can not only effectively protect the terminal 1221 and / or the explosion-proof valve 1222, but also improve the heat preservation performance of the battery pack 10 to a certain extent.

[0050] In one embodiment, the protective member 13 further includes a carrier 134. The carrier 134 and the protective rib 132 protrude from the same side of the base body 131, and the single battery 12 is supported on the carrier 134. Figure 4 Exemplarily, carriers 134 are respectively arranged on both sides of the base body 131 in the second direction X, and the two carriers 134 cooperate to support the single battery 12, so that the single battery 12 is stably arranged in the box body 11.

[0051] Please refer to Figure 5 and Figure 6 , Figure 5 which is a schematic structural diagram of the first embodiment of the protective member of the present application, Figure 6 is Figure 5 a schematic structural diagram of area A of the protective member shown.

[0052] In the first alternative embodiment, the protective rib 132 further has a connecting portion 1322, and the abutting portion 1321 is connected to the base body 131 through the connecting portion 1322. Wherein, a thinning groove 1323 is arranged on the connecting portion 1322, and the thickness D1 of the connecting portion 1322 at the position where the thinning groove 1323 is located is less than the thickness D2 of the rest of the connecting portion 1322. In this way, when subjected to an external impact, the connecting portion 1322 at the position where the thinning groove 1323 is located is more likely to break under the action of the impact force, so as to reduce the impact on the single battery 12 and further reduce the risk of safety problems occurring in the single battery 12.

[0053] Furthermore, in the first direction Z, the thinning groove 1323 is located in the middle of the connecting portion 1322. In this embodiment, by reasonably setting the position of the thinning groove 1323, the thinning groove 1323 is not too close to the base 131 to affect the structural reliability of the protective rib 132, and the thinning groove 1323 is not too far away from the base 131 to affect the function of the thinning groove 1323.

[0054] Please also read Figure 7 and Figure 8 , Figure 7 is a schematic structural diagram of the second embodiment of the protective element of the present application, Figure 8 It is a structural schematic diagram of the third embodiment of the protective element of the present application.

[0055] In the second alternative embodiment, the connection portion 1322 of the protective rib 132 is inclined relative to the second direction X. The abutment portion 1321 extends along the second direction X. The abutment portion 1321 can extend strictly along the second direction X, or there is a small angle (for example, less than 10°, etc.) between the extension direction of the abutment portion 1321 and the second direction X. In other words, the connection portion 1322 of the protective rib 132 is inclined relative to the abutment portion 1321. In this way, when the protective rib 132 contacts the single cell 12 under the action of impact force, there is a larger contact area between the abutment portion 1321 and the single cell 12, which can further reduce the damage to the single cell 12.

[0056] Figure 7 It is exemplarily shown that the connection portion 1322 of the protective rib 132 is connected to the middle position of the abutment portion 1321 . Figure 8 It is exemplarily shown that the connection portion 1322 of the protective rib 132 is connected to the end position of the abutment portion 1321 in the second direction X.

[0057] Please also read Figure 9 , Figure 9 It is a structural schematic diagram of the fourth embodiment of the protective element of the present application.

[0058] In the third alternative embodiment, the connection portion 1322 of the protective rib 132 is bent and extended along the first direction Z, so that the protective rib 132 is easier to bend under external force impact and effectively buffers the impact force, further reducing the risk of safety problems of the single battery 12.

[0059] In summary, the present application provides a battery pack. The battery pack can effectively protect the single cells by providing a protective member inside the box, and avoid the single cells from being damaged by external impact as much as possible, thereby reducing the risk of safety problems such as fire and explosion of the single cells, and thus improving the safety performance of the battery pack.

[0060] Furthermore, the protective part includes a base and a protective rib, and the abutment portion of the protective rib is spaced from the pole in its orthographic projection on the cover body, that is, the abutment portion of the protective rib avoids the pole of the single cell, so as to avoid the impact force directly acting on the pole through the protective rib as much as possible when the battery pack is impacted by external force. The pole of the single cell can be effectively protected, and the risk of safety problems such as fire and explosion of the single cell can be further reduced.

[0061] The battery pack provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: include: Box; A single battery is accommodated in the box; the single battery comprises a shell, a cover and a battery cell, the cover is fitted on the shell, and the cover and the shell cooperate to enclose a cavity for accommodating the battery cell; the cover has a pole; and A protective member is accommodated in the box body; the protective member includes a base and a protective rib, the base is located on the side of the cover body facing away from the battery cell, and the protective rib is protruding on the side of the base facing the cover body; the end of the protective rib away from the base has an abutment portion, wherein the positive projection of the abutment portion on the cover body is spaced apart from the pole.

2. The battery pack according to claim 1, characterized in that: The cover body further includes an explosion-proof valve, and the orthographic projection of the abutting portion on the cover body is spaced apart from the explosion-proof valve.

3. The battery pack according to claim 1, characterized in that: The cover body also includes an explosion-proof valve, and the explosion-proof valve is spaced apart from the pole; The protective member also includes a flexible buffer body, which is protruding from the same side of the base as the protective rib, and is used to flexibly support the cover body, wherein the orthographic projection of the flexible buffer body on the cover body overlaps with the pole and / or the explosion-proof valve.

4. The battery pack according to claim 3, characterized in that: The flexible buffer body includes a first flexible buffer body and a second flexible buffer body, the first flexible buffer body and the second flexible buffer body are spaced apart from each other, the orthographic projection of the first flexible buffer body on the cover body overlaps with the pole and is spaced apart from the explosion-proof valve, and the orthographic projection of the second flexible buffer body on the cover body overlaps with the explosion-proof valve and is spaced apart from the pole.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The protective rib also has a connecting portion, and the abutting portion is connected to the base through the connecting portion; Wherein, a thinning groove is provided on the connecting portion.

6. The battery pack according to claim 5, characterized in that: The battery pack has a first direction, and the single battery and the protective element are arranged opposite to each other along the first direction; Wherein, in the first direction, the thinning groove is located in the middle of the connecting portion.

7. The battery pack according to any one of claims 1 to 4, characterized in that: There are multiple protective ribs, and the abutting portions of the protective ribs are spaced apart from each other.

8. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack has a second direction; there are multiple protective ribs, and each of the protective ribs is distributed along the second direction; The protective rib further has a connecting portion, through which the abutting portion is connected to the base; the connecting portion is arranged obliquely relative to the second direction; and the abutting portion extends along the second direction.

9. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack has a first direction, and the single battery and the protective member are arranged opposite to each other along the first direction; the protective rib also has a connecting portion, and the abutting portion is connected to the base through the connecting portion, wherein the connecting portion bends and extends along the first direction.

10. The battery pack according to any one of claims 1 to 4, characterized in that: The protective member further comprises a carrier, the carrier and the protective rib are protrudingly arranged on the same side of the base, and the single battery is supported by the carrier.

11. The battery pack according to any one of claims 1 to 4, characterized in that: The box body includes a box body and a bottom guard plate, wherein the bottom guard plate covers the bottom of the box body, and the box body and the bottom guard plate cooperate to enclose a cavity for accommodating the single battery and the protective element; Wherein, the protective member is located between the single battery and the bottom guard plate.

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