CN211629161U

CN211629161U - Battery pack, case for same and device comprising same

Info

Publication number: CN211629161U
Application number: CN202020099558.0U
Authority: CN
Inventors: 张文辉; 王衡; 季进清; 钱木
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2020-01-16
Filing date: 2020-01-16
Publication date: 2020-10-02
Anticipated expiration: 2030-01-16

Abstract

The application provides a battery pack, a box body for the battery pack and a device comprising the battery pack. A box for a battery pack includes: the frame body is used for enclosing to form a cavity; a base plate; and a fastening member for connecting the base plate and the frame body; the fastening element comprises a first fixing part and a second fixing part, and at least part of the frame body and at least part of the bottom plate are clamped between the first fixing part and the second fixing part so as to realize the mutual connection of the bottom plate and the frame body. The battery pack comprises the box body and a battery contained in the cavity of the box body. The device comprises the battery pack, and the battery pack is used for providing electric energy. Because at least part of the frame body and at least part of the bottom plate are clamped between the first fixing part and the second fixing part, the bottom plate and the frame body can be connected with each other in such a way, the connection strength and reliability between the bottom plate and the frame body are improved, and the safety performance of the battery pack is further improved.

Description

Battery pack, case for same and device comprising same

Technical Field

The present application relates to the field of batteries, and more particularly, to a battery pack, a case for the same, and a device including the same.

Background

In the known technology, the bottom plate and the frame of the battery pack are fastened by bolts, and the fastening connection is limited to one side only. When the battery package receives external striking or vibration impact, the bolt easily takes place to become flexible and even drops, leads to the joint strength between bottom plate and the framework to hang down, and the reliability is poor, and then influences the security performance of battery package.

SUMMERY OF THE UTILITY MODEL

In view of the problems in the prior art, an object of the present application is to provide a battery pack, a case for the same, and a device including the same, which can solve the problems of low connection strength and poor reliability between a base plate and a frame, so as to improve the safety performance of the battery pack.

In order to achieve the above object, in a first aspect, the present application provides a case for a battery pack, comprising: the frame body is used for enclosing to form a cavity; a base plate; and a fastening member for connecting the base plate and the frame body; the fastening element comprises a first fixing part and a second fixing part, and at least part of the frame body and at least part of the bottom plate are clamped between the first fixing part and the second fixing part so as to realize the mutual connection of the bottom plate and the frame body.

In some embodiments of the cabinet according to the first aspect of the present application, the fastening member further includes an intruding portion that penetrates the bottom plate and protrudes into the frame; the first fixing portion and the second fixing portion are connected to the extending portion.

In some embodiments of the tank according to the first aspect of the present application, the bottom plate has a through hole, and the frame has a connection hole, and the protruding portion passes through the through hole and protrudes into the connection hole.

In some embodiments of the cabinet according to the first aspect of the present application, the bottom plate is located between the frame and the first fixing portion; the first fixing part extends along the radial direction of the through hole and exceeds the inner wall of the through hole; the second fixing portion extends along the radial direction of the connecting hole and exceeds the inner wall of the connecting hole.

In some embodiments of the case according to the first aspect of the present application, the case further comprises a connecting element for connecting with the fastening element.

In some embodiments of the case according to the first aspect of the present application, the case further comprises: the protection plate is fixed at the bottom of the bottom plate through the connecting element; the connecting element comprises a connecting part and a cover part connected to the connecting part, the connecting part penetrates through the protection plate, and at least part of the protection plate is clamped between the cover part and the fastening element.

In some embodiments of the box according to the first aspect of the present application, the fastening element further includes a support portion located in the through hole, and at least a part of the frame is disposed between the support portion and the second fixing portion.

In some embodiments of the tank according to the first aspect of the present application, the support portion extends in a radial direction of the through-hole and is spaced apart from an inner wall of the through-hole.

In some embodiments of the box according to the first aspect of the present application, the bottom plate and the frame are further connected by a sealant in a sealing manner.

In a second aspect, the present application provides a battery pack, comprising: the tank according to the first aspect of the present application; and a battery housed in the cavity of the case.

In a third aspect, the present application provides an apparatus comprising the battery pack according to the second aspect of the present application, the battery pack being for providing electrical energy.

The beneficial effect of this application is as follows: because the fastening element comprises the first fixing part and the second fixing part, and at least part of the frame body and at least part of the bottom plate are clamped between the first fixing part and the second fixing part, the bottom plate and the frame body can be connected with each other in such a way, the connection strength and reliability between the bottom plate and the frame body are improved, and the safety performance of the battery pack is further improved.

Drawings

Fig. 1 illustrates an exploded perspective view of an embodiment of a battery pack.

Fig. 2 is a bottom perspective view of the case of the battery pack of fig. 1.

Fig. 3 is a top view of fig. 2.

Fig. 4 is a cross-sectional view taken along line a-a of fig. 3 and turned 180 degrees, with an example of a fastening element in an undeformed state without forming a second fixing portion, and with the sealant shown in an exaggerated cross-sectional circle filled with hatching for clarity.

Fig. 5 is an enlarged view of the circled portion of fig. 4.

Fig. 6 is a view corresponding to fig. 5, in which the fastening element is in a state of being deformed and forming a second fixing portion.

Fig. 7A shows a schematic cross-sectional view of the fastening element of fig. 6 in an undeformed state without a second fixing portion being formed.

Fig. 7B shows a connecting element for use with the fastening element of fig. 7A.

Fig. 8A shows another example of a fastening element, wherein the fastening element is in an uninstalled and undeformed state.

Fig. 8B shows the fastening element of fig. 8A in an installed and deformed state.

Fig. 9A shows yet another example of a fastening element, wherein the fastening element is in an uninstalled state.

Fig. 9B shows the fastening element of fig. 9A in an installed state, wherein the fastening element is pivoted to expose the receiving slot.

Fig. 10 shows yet another example of a fastening element, wherein the fastening element is in an uninstalled state.

Fig. 11 is an assembled perspective view of an example of a battery of the battery pack of fig. 1.

Fig. 12 is an exploded view of fig. 11.

Fig. 13 is a schematic diagram of an example of an electrode assembly of the cell of fig. 12;

fig. 14 is a schematic view of another example of an electrode assembly of the battery of fig. 12;

fig. 15 is an example of an application of the battery pack.

Wherein the reference numerals are as follows:

z vertical 141 connecting part

P battery pack 141a external thread

1 case 142 cover

11 frame 15 sealant

111 cavity 16 runner plate

112 top wall F flow passage

113 bottom wall 17 thermal insulation pad

114 side wall 18 shield

115 hollow part 19a first washer

116 Rib 19b second washer

117 connecting hole 2 battery

12 bottom plate 21 shell

121 through hole 211 open

13 fastening element 22 electrode assembly

131 first fixing part 221 first pole piece

132 second fixing portion 222a first current collector

133 extending part 222b first active material layer

Second pole piece of C containing part 222

133a top 223a second current collector

133b bottom 223b second active material layer

133c lath 223 release film

133d receiving groove 224 first tab

133e screw 225 second lug

134 support 23 cap assembly

134a upper annulus 231 top cover plate

134b lower annular surface 232 first electrode terminal

134c corner surface 233 second electrode terminal

135 pivot axis 24 first link plate

14 connecting element 25 second connecting piece

Detailed Description

The accompanying drawings illustrate embodiments of the present application and it is to be understood that the disclosed embodiments are merely examples of the application, which can be embodied in various forms, and therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application.

In the description of the present application, unless otherwise expressly specified or limited, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or relationship to one another.

Further, expressions of directions indicated for explaining operations and configurations of respective members in the embodiment, such as upper, lower, left, right, front, and rear, are not absolute but relative, and although these indications are appropriate when the respective members are in the positions shown in the drawings, when the positions are changed, the directions should be interpreted differently to correspond to the changes.

Fig. 1 illustrates an exploded perspective view of an embodiment of a battery pack. Fig. 2 is a bottom perspective view of the case of the battery pack of fig. 1. Fig. 3 is a top view of fig. 2. Fig. 4 is a cross-sectional view taken along line a-a of fig. 3 and turned 180 degrees, with an example of a fastening element in an undeformed state without forming a second fixing portion, and with the sealant shown in an exaggerated cross-sectional circle filled with hatching for clarity. Fig. 5 is an enlarged view of the circled portion of fig. 4. Fig. 6 is a view corresponding to fig. 5, in which the fastening element is in a state of being deformed and forming a second fixing portion.

As shown in fig. 1, the battery pack P includes a case 1 and a battery 2.

The case 1 includes a frame 11, a bottom plate 12, and a fastening member 13.

The case 1 has a plurality of frames 11, for example, 4 or more, and the plurality of frames 11 are connected end to end, for example, welded, so as to enclose a cavity 111. The cavity 111 is used to house the battery 2. The size and number of the cavities 111 may be determined according to the application and capacity of the battery pack P. When the cavities 111 are provided in plural, adjacent cavities 111 may be separated by a beam. The frame 11 may be made of metal, such as aluminum alloy. The frame body 11 may be formed by die casting or integral extrusion.

The frame 11 includes a top wall 112, a bottom wall 113, and two side walls 114. The top wall 112 and the bottom wall 113 are opposed to each other in the up-down direction Z. The two side walls 114 are spaced apart from each other and connected between the top wall 112 and the bottom wall 113 in the up-down direction Z. One of the two side walls 114 forms an inner wall of the cavity 111. The inside of the housing 11 has a hollow portion 115 for weight reduction. Specifically, in the example in the figure, the top wall 112, the bottom wall 113, and the two side walls 114 enclose a hollow portion 115 inside the frame body 11. Further, in order to reinforce the structural strength of the frame body 11, a rib plate 116 may be provided inside the frame body 11. In the example of fig. 4, web 116 connects the opposing sidewalls 114. The number and arrangement of ribs 116 are not limited to the example of fig. 4, and any number and arrangement may be adopted, for example, ribs 116 may be arranged in the up-down direction Z in fig. 4, the direction opposite to both side walls 114, and the direction inclined to both the up-down direction Z and the direction opposite to both side walls 114.

The bottom plate 12 is located below the frame 11. The base plate 12 may be used to support the battery 2.

The fastening member 13 is used to connect the base plate 12 and the frame body 11. The fastening member 13 includes a first fixing portion 131 and a second fixing portion 132. At least part of the frame body 11 and at least part of the bottom plate 12 are sandwiched between the first fixing portion 131 and the second fixing portion 132, so that the bottom plate 12 and the frame body 11 are connected with each other, the connection strength and reliability between the bottom plate 12 and the frame body 11 are improved, and the safety performance of the battery pack P is improved.

Fig. 7A shows a schematic cross-sectional view of the fastening element of fig. 6 in an undeformed state without a second fixing portion being formed. Fig. 7B shows a connecting element for use with the fastening element of fig. 7A.

In the example of fig. 6 and 7A, the fastening element 13 includes a first fixing portion 131, a second fixing portion 132, and an extending portion 133. The fastening element 13 has a receiving portion C extending upward from the bottom surface, the receiving portion C being provided with an internal thread. The internal thread is provided at a position higher than the first fixing portion 131. The receiving portion C may penetrate the fastening element 13 in the vertical direction Z, or may form a blind hole without penetrating the fastening element 13 in the vertical direction Z.

In the example of fig. 6 and 7A, the protruding portion 133 penetrates the bottom plate 12 and protrudes into the frame body 11. The first fixing portion 131 and the second fixing portion 132 are connected to the extending portion 133. Accordingly, the bottom plate 12 has a through hole 121, the frame 11 has a connection hole 117, and the protruding portion 133 passes through the through hole 121 of the bottom plate 12 and protrudes into the connection hole 117 of the frame 11.

As shown in fig. 6, the bottom plate 12 is located between the frame 11 and the first fixing portion 131. The first fixing portion 131 extends in a radial direction of the through hole 121 of the base plate 12 and exceeds an inner wall of the through hole 121 of the base plate 12; the second fixing portion 132 extends in the radial direction of the connection hole 117 of the frame 11 and exceeds the inner wall of the connection hole 117 of the frame 11. Further, the first fixing portion 131 extends in the radial direction of the through hole 121 of the bottom plate 12, beyond not only the inner wall of the through hole 121 of the bottom plate 12 but also the inner wall of the connection hole 117 of the frame 11; similarly, the second fixing portion 132 extends in the radial direction of the connection hole 117 of the frame 11, beyond not only the inner wall of the connection hole 117 of the frame 11 but also the inner wall of the through hole 121 of the bottom plate 12; thus, in the vertical projection, the portion of the housing 11 sandwiched between the first fixing portion 131 and the second fixing portion 132 overlaps with the portion of the bottom plate 12 sandwiched between the first fixing portion 131 and the second fixing portion 132, thereby increasing the strength of the mutual connection between the bottom plate 12 and the housing 11.

In the example shown in fig. 6, the second fixing portion 132 is formed by deformation of the protruding portion 133. Due to the provision of the receiving portion C, the insertion portion 133 is a thin-walled tube. In this example, the fastening element 13 is a blind rivet element (in particular a blind rivet nut), and the fastening element 13 is deformed by operation of a blind rivet tool (for example a blind rivet gun) to form the second fixing portion 132. In an example operation, the extending portion 133 of the fastening element 13 passes through the bottom plate 12 upward and extends into the frame 11, the first fixing portion 131 is kept fixed on the lower side of the bottom plate 12 under the action of the rivet gun, and then the thin-walled cylinder is pulled downward by the rivet gun, so that the thin-walled cylinder is deformed downward and radially outward at the frame 11 (specifically at the connecting hole 117 of the bottom wall 113) to radially protrude, so as to form the second fixing portion 132, and therefore the second fixing portion 132 is matched with the first fixing portion 131 to clamp at least part of the frame 11 and at least part of the bottom plate 12, and the bottom plate 12 and the frame 11 are connected with each other. In addition, the second fixing portion 132 formed by deformation is annular and can entirely cover the connection hole 117 of the housing 11, thereby ensuring sealability at the connection hole 117 of the housing 11.

In the example of fig. 6 and 7A, the fastening element 13 may further include a support portion 134. The support portion 134 is provided on the protruding portion 133. The support portion 134 may be integrally formed with the protruding portion 133, or the support portion 134 and the protruding portion 133 may be separately formed and connected together by means such as welding, adhesion, or the like. The support portion 134 is annularly stepped. The supporting portion 134 is located in the through hole 121 of the bottom plate 12, and at least a part of the frame 11 is disposed between the supporting portion 134 and the second fixing portion 132. The support portion 134 extends in a radial direction of the penetration hole 121 and is spaced apart from an inner wall of the penetration hole 121.

The support portion 134 includes an upper annular surface 134a, a lower annular surface 134b, and a corner surface 134 c. The upper ring surface 134a surrounds the protruding portion 133 and is a flat ring surface, and the upper ring surface 134a can support the frame body 11 (specifically, the bottom wall 113 of the frame body 11) from below. The lower annulus 134b is located below the upper annulus 134 a. The lower annular surface 134b is illustrated as a sloped annular surface and a flat annular surface, but is not limited thereto, and the lower annular surface 134b may be a flat annular surface. The corner surface 134c is connected between the upper and lower annular surfaces 134a, 134 b. The corner face 134c and the inner wall of the through-hole 121 are spaced apart from each other. The corner surface 134c is an arc-shaped surface to avoid damage to the inner wall of the through hole 121 of the base plate 12 when the corner surface 134c of the supporting portion 134 has a sharp corner. The lower annular surface 134b is coupled to the surface of the first fixing portion 131 supporting the base plate 12. As shown, the surface of the first fixing portion 131 supporting the base plate 12 includes an inclined annular surface and a flat annular surface, and the inclined annular surface is coplanar with the lower annular surface 134 b. The first fixing portion 131 supports the frame body 11 through a portion around the through hole 121 of the bottom plate 12, and the upper ring surface 134a of the supporting portion 134 can directly support the frame body 11, so that the frame body 11 has two supporting positions spaced apart from each other at the connecting hole 117, thereby avoiding a possibility that the frame body 11 is bent and deformed downward when being supported only by the first fixing portion 131 at the connecting hole 117, and further ensuring the surface contact adhesion between the frame body 11 and the bottom plate 12.

Fig. 8A shows another example of a fastening element in an uninstalled and undeformed state, while the connecting element is presented for ease of illustration. Fig. 8B shows the fastening element of fig. 8A in an installed and deformed state, while the connecting element is given for ease of illustration.

The fastening element of fig. 8A is similar to the fastening element of fig. 7A, except that in the example of fig. 7A, the protrusion 133 is cylindrical before being deformed, whereas in the example of fig. 8A, the protrusion 133 is deformed into a top 133a, a bottom 133b, and strips 133c located between the top 133a and the bottom 133b and spaced apart from each other in the circumferential direction. The top 133a is provided with an internal thread (not shown). The bottom portion 133b and the first fixing portion 131 are provided with smooth through holes (not shown). The height of the bottom 133b may be equal to or slightly lower than the depth of the perforation 121 of the bottom plate 12. The slats 133c are arched outwardly without being forced before installation. Likewise, the lath 133c may be deformed by the aforementioned operation of the rivet tool to form the second fixing portion 132. In an alternative embodiment, the lath 133c may be deformed by the operation of the connection part 141 of the connection member 14 to form the second fixing part 132, specifically, when mounting, the connecting portion 141 of the connecting member 14 passes through the first fixing portion 131 and the bottom portion 133b of the fastening member 13 and is screw-coupled to the top portion 133a (the connecting portion 141 of the connecting member 14 has the external screw thread 141a), the lath 133c is elastically gathered toward the axis of the fastening member 131, and then the fastening member 31 and the connecting member 14 pass through the bottom plate 12 together and extend into the frame 11, when the slat 133c is inserted into the frame body 11, the first fixing portion 131 is made to be fixed, the connecting member 14 is pulled in the downward direction, the top portion 133a pushes the slat 133c under the pulling of the connecting member 14, the central portion of the slat 133c is deformed to protrude outward in the radial direction, the strip 133c thus forms a bent angle at the bottom 133b as shown in fig. 8A and presses against the frame 11 (specifically, at the connecting hole 117 of the bottom wall 113) to form the second fixing portion 132. The force required for the fastening member 13 of fig. 8B to form the second fixing portion 132 is small as compared with the case of fig. 7A.

Fig. 9A shows yet another example of a fastening element, wherein the fastening element is in an uninstalled state. Fig. 9B shows the fastening element of fig. 9A in an installed state, wherein the fastening element is pivoted to expose the receiving slot.

As shown in fig. 9A and 9B, the fastening member 13 includes a first fixing portion 131, a second fixing portion 132, an extending portion 133, and a pivot shaft 135.

The first fixing portion 131 is a nut having an outer circumference sized to abut the nut against the bottom plate 12 from below, specifically, against the periphery of the through hole 121 of the bottom plate 12.

The protruding portion 133 extends in the vertical direction Z. The insertion portion 133 is provided with a housing groove 133 d. Both sides of the receiving groove 133d in the direction intersecting the vertical direction Z are open. The second fixing portion 132 can be accommodated in the accommodating groove 133 d. The pivot shaft 135 passes through the receiving groove 133d and pivotally couples the second fixing portion 132 in the receiving groove 133 d. The position of the pivot shaft 135 is set such that the second fixing portion 132 can pivot and the second fixing portion 132 can be exposed at both sides of the opening of the receiving groove 133 d. In the example shown in the drawings, the pivot shaft 135 is biased toward one of the two openings of the housing groove 133 d. The second fixing portion 132 is plate-shaped. The second fixing portion 132 is sized to be pivotally accommodated and hidden in the accommodating groove 133d, and also pivotally exposed to the openings on both sides of the accommodating groove 133d and to be able to abut against the housing 11 (specifically, the bottom wall 113 around the connecting hole 117 of the housing 11). In the state shown in fig. 9A, the dimension of the second fixing portion 132 in the up-down direction Z is larger than the dimension in the opening direction of both sides, so that in the state of fig. 9B, the second fixing portion 132 has portions exposed on both sides of the opening of the receiving groove 133d and the portions exposed on both sides of the opening of the receiving groove 133d abut against the frame body 11, specifically, the bottom wall 113 of the frame body 11, that is, the bottom wall 113 around the connection hole 117 of the frame body 11, in comparison with the structure of the box body 1 of fig. 6. In order to facilitate the pivoting of the second fixing portion 132, the protruding portion 133 may be provided with a channel (not shown) extending from the bottom of the protruding portion 133 in the up-down direction Z to 133a, whereby the second fixing portion 132 may be manually assisted to toggle to the position shown in fig. 9B by inserting, for example, a thin rod, a needle, etc. through the channel.

The insertion portion 133 is provided with a screw 133e, the first fixing portion 131 and the insertion portion 133 are provided on the insertion portion 133 by screw connection, and the first fixing portion 131 and the second fixing portion 132 are adjusted in the distance by screwing the first fixing portion 131 in the form of a nut, thereby connecting the frame body 11 and the bottom plate 12 to each other.

Thus, the first fixing portion 131 and the second fixing portion 132 are both connected to the extending portion 133.

In operation, the second fixing portion 132 is first accommodated and hidden in the accommodating groove 133d, then the extending portion 133 passes through the through hole 121 of the bottom plate 12 and extends into the connecting hole 117 of the frame 11, so that the accommodating groove 133d is located inside the frame 11, after the accommodating groove 133d is separated from the connecting hole 117 of the frame 11, the opening of the second fixing portion 132 at both sides of the accommodating groove 133d is not limited, the second fixing portion 132 is pivoted and exposed at the opening at both sides of the accommodating groove 133d by the above-mentioned offset arrangement of the pivot shaft 135 or by a shaking manner (or other manners described above), and then when the operator feels that the second fixing portion 132 abuts against the periphery of the connecting hole 117 of the frame 11, the first fixing portion 131 is screwed, so that the first fixing portion 131 and the second fixing portion 132 connect the frame 11 and the bottom plate 12 to each other.

The example of fig. 9A and 9B differs from the example of fig. 8A and 8B in that the connecting member 14 is not required, thereby simplifying the structure.

The fastening member of fig. 10 is similar to the fastening member shown in fig. 9A and 9B, and similarly, the first fixing portion 131 takes the form of a nut, and the protruding portion 133 has a receiving groove 133d and a thread 133 e.

The fastening member of fig. 10 is different from the fastening member shown in fig. 9A and 9B in that the second fixing portion 132 is separated by a portion of the protruding portion 133 to form a cantilevered spring-like shape. The second fixing portion 132 is located outside the accommodating groove 133d both when the fastening member 13 is not mounted and after it is mounted.

In operation, the extending portion 133 passes through the through hole 121 of the bottom plate 12 and extends into the connecting hole 117 of the frame 11, so that the receiving groove 133d is located inside the frame 11, after the receiving groove 133d is separated from the connecting hole 117 of the frame 11, the second fixing portion 132 is not limited at the corresponding opening of the receiving groove 133d, the second fixing portion 132 is located outside the receiving groove 133d due to elastic recovery, and then when an operator feels that the second fixing portion 132 abuts against the periphery of the connecting hole 117 of the frame 11, the first fixing portion 131 is screwed, so that the first fixing portion 131 and the second fixing portion 132 connect the frame 11 and the bottom plate 12 to each other.

Also, the example of fig. 10 is different from the examples of fig. 8A and 8B in that the connection member 14 is not required, thereby simplifying the structure.

In order to enhance the sealing performance between the frame 11 and the bottom plate 12, the box body 1 may further include a sealant 15, and the sealant 15 is disposed between the frame 11 and the bottom plate 12 along the entire circumference of the cavity 111 formed by the frame 11. Furthermore, the sealant 15 may be provided between the bottom wall 113 and the bottom plate 121 around the connection hole 117 of the frame 11 as shown in fig. 6, thereby improving the sealability of the frame 11 at the connection hole 117.

To enhance temperature management of the cells 2, the case 1 may further include a flow field plate 16. The flow channel plate 16 is disposed below the bottom plate 12, and the flow channel plate 16 forms a flow channel F for flowing a heat exchange medium with the bottom plate 12. In the example shown in the drawings, the flow field plate 16 may be formed by stamping into a recess that encloses the flow field F with the bottom plate 12.

In order to enhance the uniformity of the operating temperature of the battery 2, the case 1 may further include a thermal insulating pad 17. The heat insulating pad 17 is disposed below the flow field plate 16. The material of the heat insulation pad 17 can be heat insulation cotton, foam cotton and the like. The heat insulating pad 17 blocks heat transfer at least in the downward direction of the flow channel plate 16, thereby insulating the battery 2.

In order to protect the floor 12 of the tank 1 and even the runner plate 16 from external impacts (e.g. from flying stones), the tank 1 may also comprise a protective plate 18. A shield plate 18 is provided below the base plate 12. When the case 1 is provided with the flow passage plate 16, the shielding plate 18 is disposed under the flow passage plate 16, and further, a first gasket 19a may be provided between the shielding plate 18 and the flow passage plate 16 around the first fixing portion 131 in order to improve support stability, fastening degree and sealability. When the tank 1 is further provided with the thermal pad 17, the protection plate 18 is not only provided below the thermal pad 17 but also accommodates the thermal pad 17, in other words, the protection plate 18 may be formed with a recess that accommodates the thermal pad 17 by, for example, press forming.

The securing of the shield plate 18 may take a variety of forms. To simplify the fixing structure, a fixing structure of the shielding plate 18 may be provided based on the structures of fig. 7B, 8B, 9B, and 10.

Based on the example shown in fig. 6 and 7B, the shielding plate 18 may be fixed by the connection element 14. In particular, the connecting element 14 is intended to be connected with the fastening element 13. In particular, the connecting element 14 comprises a connecting portion 141, the connecting portion 141 being provided with an external thread, the external thread of the connecting portion 141 cooperating with an internal thread of the protruding portion 133, enabling the connection of the connecting element 14 with the fastening element 13. The connecting element 14 further comprises a cover 142. The cover 142 is connected to the connection portion 141. The cap 142 may be formed integrally with the connection part 141, or the cap 142 and the connection part 141 may be separately formed and screw-coupled. The connection portion 141 passes through the shielding plate 18, and at least part of the shielding plate 18 is interposed between the cover portion 142 and the fastening member 13, and specifically, at least part of the shielding plate 18 is interposed between the cover portion 142 and the first fixing portion 131 of the fastening member 13. Further, in order to increase a contact area, improve a fastening degree, and improve sealability, a second gasket 19b may be provided between the cover 142 and the shielding plate 18.

Based on the example shown in fig. 8B, a nut (not shown) may be screwed on the connection portion 141 of the connection member 14. The fastening element 13 passes through the protection plate 18, and at least part of the protection plate 18 is interposed between the nut and the first fixing portion 131 of the fastening element 13. Likewise, a second washer 19b may be provided between the nut and the shield plate 18 in order to increase the contact area and improve the tightening.

Based on the example shown in fig. 9B and 10, a further nut (not shown) can be screwed onto the fastening element 13. The fastening element 13 passes through the protection plate 18, and at least part of the protection plate 18 is interposed between the additional nut and the first fixing portion 131 of the fastening element 13. Likewise, a second washer 19b may be provided between the additional nut and the protection plate 18 in order to increase the contact area and the tightening.

Fig. 11 is a perspective view of an example of a battery. Fig. 12 is an exploded view of fig. 11. Fig. 13 is a schematic diagram of an example of an electrode assembly of the battery of fig. 12. Fig. 14 is a schematic view of another example of an electrode assembly of the battery of fig. 12.

Referring to fig. 11 to 14, the battery 2 includes a case 21, an electrode assembly 22, a cap assembly 23, a first connector 24, a second connector 25, and an electrolyte (not shown).

The housing 21 has an opening 211 that is open on one side in the vertical direction, and the other side in the vertical direction of the housing 21 is closed. The housing 21 may be made of a material of conductive metal such as aluminum or aluminum alloy. The housing 21 may have a hexahedral shape or other shapes.

Electrode assembly 22 is housed in case 21. The electrode assembly 22 is a core component of the battery 2 that performs the charge and discharge functions. The electrode assembly 22 includes a first pole piece 221, a second pole piece 222, a separator 223, a first tab 224, and a second tab 225. The separator 223 separates the first pole piece 221 and the second pole piece 222.

The first pole piece 221 includes a first current collector 221a and a first active material layer 221b disposed on a surface of the first current collector 221. The first active material layer 221b contains a first active material. The first active material layer 221b may be disposed on one surface or both surfaces of the first current collector 221 according to actual needs. The second electrode sheet 222 includes a second current collector 222a and a second active material layer 222b disposed on a surface of the second current collector 222. The second active material layer 222b may be disposed on one surface or both surfaces of the second current collector 222 according to actual needs. The second active material layer 222b contains a second active material. The first active material and the second active material effect the de-intercalation of active ions (e.g., lithium ions for lithium ion batteries). The first pole piece 221 and the second pole piece 222 are opposite in electrical property, that is, one of the first pole piece 221 and the second pole piece 222 is a positive pole piece and the other of the first pole piece 221 and the second pole piece 222 is a negative pole piece. Here, the first tab 224 may be formed by cutting the first current collector 221a or separately formed and fixedly coupled to the first current collector 221 a. Likewise, the second tab 225 may be formed by cutting the second current collector 222a or formed separately and fixedly attached to the second current collector 222 a.

Referring to fig. 13, the first pole piece 221, the second pole piece 222, and the separator 223 are wound to form a wound electrode assembly 22, and the electrode assembly 22 is flat. Referring to fig. 14, the first pole piece 221, the second pole piece 222, and the separator 223 are laminated in the thickness direction to form the laminated electrode assembly 22.

The number of the electrode assemblies 22 is not limited and may be one or more.

The cap assembly 23 includes a cap plate 231, a first electrode terminal 232, and a second electrode terminal 233. The first and

second electrode terminals

232 and 233 are disposed on the top cap plate 231. The top cap plate 231 may be connected to the case 21 by welding or the like so as to cover the opening 211 of the case 21 to enclose the electrode assembly 22 within the case 21.

The first connection member 24 electrically connects the first tab 224 of the electrode assembly 22 with the first electrode terminal 232 of the cap assembly 23.

The second connector 25 electrically connects the second tab 225 of the electrode assembly 22 with the second electrode terminal 233 of the cap assembly 23.

The electrolyte is injected into the case 21 and impregnates the electrode assembly 21, specifically, the first and

second pole pieces

221 and 222 and the separator 223.

Note that the battery shown in fig. 11 is a can-type battery, but not limited thereto, and the battery 2 may be a pouch-type battery, i.e., the case 21 is replaced with a metal plastic film (e.g., an aluminum plastic film, a steel plastic film, etc.) and the top cover assembly 23 is eliminated.

In addition, a plurality of cells 2 may be arranged to constitute a battery module, and the specific number may be adjusted according to the application and capacity of the battery module, as shown in fig. 1. In other words, the battery pack P may include battery modules. The number of battery modules included in the battery pack P may be adjusted according to the application and capacity of the battery pack P.

Fig. 15 shows an example of an apparatus for application of the battery pack.

In the example of fig. 15, the device to which the battery pack is applied is an electric vehicle. In fig. 15, the electric vehicle includes a vehicle body and wheels. A driving motor, a transmission mechanism and a battery pack P are arranged in the vehicle body. The plurality of batteries of the battery pack P are electrically connected to the driving motor, and the battery pack P serves as a power source to supply electric power. The wheels are arranged at the lower part of the vehicle body. The driving motor is connected with the wheels through a transmission mechanism so as to drive the automobile to move by using the electric energy provided by the battery pack P.

However, the device may be, but is not limited to, an electric vehicle, and the device may be any electric vehicle (e.g., a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship, and a satellite, an energy storage system, and the like. In other words, the battery pack P may be used as a power source of the device and also as an energy storage unit of the device.

The above detailed description describes exemplary embodiments, but is not intended to limit the combinations explicitly disclosed herein. Thus, unless otherwise specified, various features disclosed herein can be combined together to form a number of additional combinations that are not shown for the sake of brevity.

Claims

1. A case (1) for a battery pack, comprising:

the frame body (11) is used for enclosing to form a cavity (111);

a base plate (12); and

a fastening element (13) for connecting the base plate (12) and the frame (11);

the fastening element (13) comprises a first fixing part (131) and a second fixing part (132), and at least part of the frame body (11) and at least part of the bottom plate (12) are clamped between the first fixing part (131) and the second fixing part (132) so as to realize the mutual connection of the bottom plate (12) and the frame body (11).

2. Case (1) according to claim 1,

the fastening element (13) further comprises an extending part (133), and the extending part (133) penetrates through the bottom plate (12) and extends into the frame body (11);

the first fixing portion (131) and the second fixing portion (132) are connected to the extending portion (133).

3. Case (1) according to claim 2,

the bottom plate (12) is provided with a through hole (121), the frame body (11) is provided with a connecting hole (117), and the extending part (133) penetrates through the through hole (121) and extends into the connecting hole (117).

4. Case (1) according to claim 3,

the bottom plate (12) is positioned between the frame body (11) and the first fixing part (131);

the first fixing part (131) extends along the radial direction of the perforation (121) and exceeds the inner wall of the perforation (121);

the second fixing portion (132) extends in a radial direction of the connection hole (117) and exceeds an inner wall of the connection hole (117).

5. Case (1) according to any one of claims 1 to 4, characterized in that said case (1) further comprises a connection element (14) for connection with said fastening element (13).

6. Case (1) according to claim 5, characterized in that said case (1) further comprises:

a protection plate (18) fixed to the bottom of the base plate (12) by the connection member (14);

the connecting element (14) comprises a connecting part (141) and a cover part (142) connected to the connecting part (141), the connecting part (141) penetrates through the protection plate (18), and at least part of the protection plate (18) is clamped between the cover part (142) and the fastening element (13).

7. Case (1) according to claim 3,

the fastening element (13) further comprises a support portion (134), the support portion (134) is located in the through hole (121), and at least part of the frame body (11) is arranged between the support portion (134) and the second fixing portion (132).

8. Case (1) according to claim 7,

the supporting portion (134) extends along the radial direction of the perforation (121) and is arranged at a distance from the inner wall of the perforation (121).

9. Case (1) according to any one of claims 3, 4, 7, 8,

the bottom plate (12) is connected with the frame body (11) in a sealing mode through a sealing glue (15).

10. A battery pack (P), comprising:

-a case (1) according to any one of claims 1 to 9; and

a battery (2) accommodated in the cavity (111) of the case (1).

11. An apparatus, comprising:

a battery pack (P) according to claim 10 for providing electrical energy.