CN211629184U - End plate, battery module, battery pack, and device using battery module as power supply - Google Patents

Abstract

The present invention relates to an end plate, a battery module, a battery pack, and a device using the battery module as a power source, the end plate including a first fitting portion located at an end portion of the end plate in a height direction of the end plate; the first matching part comprises a first end face and a second end face which are oppositely arranged along the thickness direction of the end plate, and the first end face is used for connecting an insulating cover of the battery module; the width of the first end face is L1, and the width of the second end face is L2; wherein L1 is more than L2. In the embodiment of the application, the width L1 that the first cooperation portion of this end plate is used for connecting the first terminal surface of insulating boot is great to can increase the connection area between end plate and the insulating boot, under the free bulging force effect of battery, pressure between end plate and the insulating boot is less, can reduce the risk that the end plate crushes the insulating boot, thereby can reduce the risk of end plate and the free short circuit of battery that the insulating boot damage leads to, improve battery module's security.

Description

End plate, battery module, battery pack, and device using battery module as power supply

Technical Field

The present application relates to the field of energy storage device technology, and more particularly, to an end plate, a battery module, a battery pack, and a device using the battery module as a power source.

Background

The battery module comprises a plurality of battery monomers stacked mutually and a frame structure, the frame structure comprises end plates, the end plates are positioned at two ends of the stacking direction of the battery monomers, the thickness direction of the end plates is arranged, an insulating cover is further arranged between each end plate and each battery monomer, and the insulating cover is used for realizing insulation between each battery monomer and each end plate. During the operation of the battery module, the damage of the insulating cover can cause the short circuit between the battery monomer and the end plate, and the failure of the battery module is caused.

SUMMERY OF THE UTILITY MODEL

The application provides an end plate, battery module, group battery and use battery module as the device of power, and this end plate is great with the area of contact of insulating boot to improve the structural strength of insulating boot.

A first aspect of embodiments of the present application provides an end plate for a battery module, the end plate including a first fitting portion located at an end of the end plate in a height direction of the end plate;

the first matching part comprises a first end face and a second end face which are oppositely arranged along the thickness direction of the end plate, and the first end face is used for connecting an insulating cover of the battery module;

the width of the first end face is L1, and the width of the second end face is L2;

wherein L1 is more than L2.

In one possible design, the first fitting portion includes a body portion and an extension portion that is connected to an end portion of the body portion in the width direction of the end plate, and an end surface of the extension portion for connecting the insulating cover of the battery module is flush with an end surface of the body portion for connecting the insulating cover of the battery module.

In one possible design, the end plate is provided with an outer end face for being attached to a side plate of the battery module along the width direction of the end plate, and the distance between the extending part and the outer end face is W2, and W2 is more than or equal to 0 and less than or equal to 11 mm.

In one possible design, the thickness of the extension part in the thickness direction of the end plate is W3, and W3 is more than or equal to 1mm and less than or equal to 3 mm.

In one possible design, the end plate further includes a second fitting portion provided with a mounting hole, and the first fitting portion is located on at least one side of the second fitting portion in a height direction of the end plate;

the first matching part further comprises an arc part, the arc part is connected to the end part of the body part along the width direction of the end plate, and the circle center of the circle where the arc part is located and the corresponding mounting hole are located on the same side of the arc part.

In one possible embodiment, the circular arc has a central angle β, wherein β is equal to or greater than 50 ° and equal to or less than 90 °.

In one possible design, the extension part is provided with an avoiding part, and the avoiding part is used for avoiding the fastener installed in the installation hole.

In one possible design, the distance between the second end face (132) and the circle center of the mounting hole (11) along the width direction (Y) of the end plate is W1, and W1 mm is larger than or equal to 8mm and smaller than or equal to 12 mm.

A second aspect of the embodiments of the present application provides a battery module, including:

a plurality of battery cells;

the end plate as described above; and

an insulating cover between the plurality of battery cells and the end plate;

wherein the first end face is connected with the insulating cover.

A third aspect of the embodiments of the present application provides a battery pack, where the battery pack includes a case and the battery module described above, and the battery module is accommodated in the case.

A fourth aspect of the embodiments of the present application provides an apparatus using a battery module as a power supply, where the battery module is the above-described battery module.

In the embodiment of the application, the width L1 that the first cooperation portion of this end plate is used for connecting the first terminal surface of insulating boot is great to can increase the connection area between end plate and the insulating boot, under the free bulging force effect of battery, pressure between end plate and the insulating boot is less, can reduce the risk that the end plate crushes the insulating boot, thereby can reduce the risk of end plate and the free short circuit of battery that the insulating boot damage leads to, improve battery module's security.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

FIG. 1 is a schematic structural diagram of an electrical device provided herein in one embodiment;

fig. 2 is an exploded view of the battery pack of fig. 1 in one embodiment;

FIG. 3 is a schematic diagram of the battery module of FIG. 2 in one embodiment;

FIG. 4 is a partial exploded view of FIG. 3;

FIG. 5 is a schematic view of the end plate of FIG. 4 in a first embodiment;

FIG. 6 is a front view of FIG. 5;

FIG. 7 is a top view of FIG. 5;

FIG. 8 is an enlarged view of a portion I of FIG. 3;

FIG. 9 is an enlarged view of a portion II of FIG. 7;

FIG. 10 is a schematic illustration of the end plate of FIG. 4 in a second embodiment;

FIG. 11 is a schematic view of the end plate of FIG. 4 in a third embodiment;

fig. 12 is a partially enlarged view of the portion III in fig. 11.

Reference numerals:

d-means;

an M-cell group;

m1-case;

m11-upper box body;

m12-lower box;

m13-containing cavity;

m2-battery module;

1-an end plate;

11-mounting holes;

13-a first mating portion;

131-a first end face;

131 a-glue overflow groove;

132-a second end face;

133-arc portion;

134-a body portion;

136-an extension;

136 a-an escape portion;

137-a first upper end face;

14-a second mating portion;

141-a second upper end face;

142-an outer end face;

2-an insulating cover;

3-side plate;

31-flanging;

4-a bottom plate;

41-a mating column;

5-a fastener;

6-battery cell.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

The embodiment of the application provides an electric device, a battery pack and a battery module, wherein the electric device is used as a power supply, the electric device can be a mobile device such as a vehicle, a ship, a small airplane and the like, the electric device comprises a power source, the power source is used for providing driving force for the electric device, and the power source can be configured to be the battery module for providing electric energy for the electric device. The driving force of the electric device may be electric energy, and may also include electric energy and other energy sources (e.g., mechanical energy), and the power source may be a battery module (or a battery pack). In addition, the electric device can also be energy storage equipment such as a battery cabinet, and the battery cabinet can comprise a plurality of battery modules (or battery packs), so that the battery cabinet can output electric energy. Therefore, any electric device capable of using the battery unit as a power source is within the scope of the present application.

As shown in fig. 1, taking a vehicle as an example, the electric device D in the embodiment of the present application may be a new energy vehicle, which may be a pure electric vehicle, a hybrid electric vehicle, an extended range electric vehicle, or the like. The vehicle can comprise a battery pack M and a vehicle main body, wherein the battery pack M is arranged on the vehicle main body, the vehicle main body is also provided with a driving motor, the driving motor is electrically connected with the battery pack M, the battery pack M provides electric energy, and the driving motor is connected with wheels on the vehicle main body through a transmission mechanism so as to drive the vehicle to move. Specifically, the battery pack M may be horizontally disposed at the bottom of the vehicle body.

As shown in fig. 2, the battery pack M includes a box M1 and a battery module M2, wherein the box M1 has a receiving cavity M13, the battery module M2 is received in the receiving cavity M13, the number of the battery modules M2 may be one or more, and a plurality of battery modules M2 are arranged in the receiving cavity M13. The type of the case M1 is not limited, and may be a frame-like case, a disc-like case, a box-like case, or the like. Specifically, as shown in fig. 2, the case M1 may include a lower case M12 accommodating the battery module M2 and an upper case M11 covering the lower case M12.

Note that, the thickness direction X of the end plate, the width direction Y of the end plate, and the height direction Z of the end plate mentioned herein are defined with reference to the placement direction of the end plate 1 when the battery pack M is in normal use, and in the battery pack M, the thickness direction X of the end plate 1, the width direction Y of the end plate 1, and the height direction Z of the end plate 1 are perpendicular to each other (three are substantially perpendicular to each other), that is, the height direction Z of the end plate 1 is perpendicular to a plane formed by the width direction Y of the end plate 1 and the thickness direction X of the end plate 1.

As shown in fig. 3, the battery module M2 includes a plurality of battery cells 6 and a frame structure for fixing the battery cells 6, wherein the plurality of battery cells 6 may be arranged in the thickness direction X of the end plate. The frame structure may include an end plate 1, the end plate 1 being located at an end portion of the arrangement direction (thickness direction X of the end plate) of the plurality of battery cells 6 for restricting movement of the battery cells in the thickness direction X of the end plate, and in a specific embodiment, the frame structure may further include a side plate 3, the two side plates 3 being located at end portions of the battery cells 6 in the width direction Y of the end plate, and the side plate 3 being connected to the end plate 1, thereby forming a frame structure; in another embodiment, the frame structure may be provided without side plates, and the battery cells 6 are stacked and fixedly connected by a tie, the end plates and the tie forming the frame structure.

Specifically, as shown in fig. 3, the battery module M2 may further include an insulating cover 2, where the insulating cover 2 is located between the end plate 1 and the battery cell 6, and is used for achieving insulation between the end plate 1 and the battery cell 6 and reducing the risk of short circuit between the end plate 1 and the battery cell 6.

In a specific embodiment, as shown in fig. 4, the battery module may further include a bottom plate 4, the bottom plate 4 is located at an end of the battery cell 6 in a height direction Z of the end plate, and the bottom plate 4 is provided with a fitting post 41, and at the same time, the end plate 1 is provided with a mounting hole 11, the mounting hole 11 penetrates the end plate 1 in the height direction Z of the end plate, so that the end plate 1 and the fitting post 41 of the bottom plate 4 can be connected by a fastener 5.

The inventor finds that, during the operation of the battery cell 6, an expansion force exists, the expansion force presses the insulating cover 2 and the end plate 1 in the thickness direction X of the end plate 2, when the contact area between the insulating cover 2 and the end plate 1 is small, the pressure between the insulating cover 2 and the end plate 1 is large, the risk of damage to the insulating cover 2 is high, and after the insulating cover 2 is damaged, the battery cell 6 is short-circuited with the end plate 1, so that the battery module M2 fails. In the embodiment of the present application, the contact area between the insulating cover 2 and the end plate 1 is increased mainly by improving the specific structure of the end plate 1, thereby improving the safety of the battery module M2.

Specifically, as shown in fig. 5, the end plate 1 includes a first fitting portion 13, and the first fitting portion 13 is located at an end portion of the end plate 1 in a height direction Z of the end plate, and at the same time, the end plate 1 may further include a second fitting portion 14, and the first fitting portion 13 and the second fitting portion 14 are arranged in the height direction Z of the end plate, wherein the second fitting portion 14 may be provided with a mounting hole 11, and the mounting hole 11 is used for realizing connection between the end plate 1 and a bottom plate of a battery module or a battery pack.

In a specific embodiment, the end plate 1 may include a first engagement portion 13, and the first engagement portion 13 is located at one end of the end plate 1 in the height direction Z of the end plate. In another embodiment, as shown in fig. 6, the end plate 1 includes two first fitting portions 13 (the two first fitting portions 13 are shown by two dashed boxes labeled 13 in fig. 6), and the two first fitting portions 13 are located at both ends of the end plate 1 in the height direction Z of the end plate, and the end plate 1 may further include a second fitting portion 14, the second fitting portion 14 being located between the two first fitting portions 13 in the height direction Z of the end plate. When the first fitting portions 13 are located at both ends of the second fitting portion 14, the two first fitting portions 13 may be identical or different in structure.

As shown in fig. 3 and 7, the first mating portion 13 includes a first end surface 131 and a second end surface 132, which are oppositely disposed, along the thickness direction X of the end plate 1, wherein the first end surface 131 is located at a side close to the insulating cover 2 for connecting with the insulating cover 2, and the second end surface 132 is located at a side far from the insulating cover. Meanwhile, in the width direction Y of the end plate 1, the width of the first end face 131 is L1, the width of the second end face 132 is L2, and L1 > L2.

In this embodiment, the width L1 of the first matching part 13 of the end plate 1, which is used for connecting the first end face 131 of the insulating cover 2, is large, so that the contact area between the end plate 1 and the insulating cover 2 can be increased, the pressure between the end plate 1 and the insulating cover 2 is small under the action of the expansion force of the battery cell 6, the risk that the insulating cover 2 is crushed by the end plate 1 can be reduced, the risk that the insulating cover 2 is damaged to cause short circuit between the end plate 1 and the battery cell 6 can be reduced, and the safety of the battery module M2 is improved.

In one embodiment, as shown in fig. 3, 6 and 7, the first mating portion 13 includes a body portion 134 (the body portion 134 is a structure located within a dashed line frame of reference numeral 134 in fig. 7), and the first mating portion 13 may further include an extension portion 136, wherein the extension portion 136 is connected to an end portion of the body portion 134 in the width direction Y of the end plate, and the extension portion 136 (the extension portion 136 is a structure located within a dashed line frame of reference numeral 136 in fig. 7). The end face of the insulating cover 2 for connecting the battery module M2 is flush with the end face of the insulating cover 2 for connecting the battery module M2 of the body part 134.

In this embodiment, the end face of the extension 136 for connecting the insulating cover 2 and the end face of the main body 134 for connecting the insulating cover 2 together form the first end face 131, and when the two end faces are flush with each other, the end plate 1 and the insulating cover 2 are in planar contact (or approximately planar contact), so that the pressure between the end plate 1 and the insulating cover 2 is further reduced, and the safety of the insulating cover 2 is improved.

In addition, in the present embodiment, by providing the extension portion 136 located at the end portion of the main body portion 134 in the width direction Y of the end plate, the end surface area of the first end surface 131 can be increased, thereby improving the safety of the insulating cover 2.

Specifically, as shown in fig. 7 and 8, the first engaging portion 13 may further include an arc portion 133 (the arc portion 133 is located within a double-dashed frame indicated by reference numeral 133 in fig. 7), the arc portion 133 is connected to an end portion of the main body portion 134 in the width direction Y of the end plate, and a center of a circle where the arc portion 133 is located and the corresponding mounting hole 11 are located on the same side of the arc portion 133.

In this embodiment, by providing the arc portion 133 located on the same side as the mounting hole 11, and extending the arc portion 133 to be connected to the extension portion 136, the arc portion 133 can reduce the stress concentration of the end plate 1, thereby improving the structural strength of the end plate 1 and reducing the risk of damage to the extension portion 136 when receiving an expansion force. In addition, the arc-shaped structure of the arc portion 133 can leave enough space for the fastener to be mounted in the mounting hole 11, thereby facilitating the mounting of the end plate 1.

As shown in fig. 7, the width L1 of the first end surface 131 of the first engaging portion 13 is the sum of the widths of the main portion 134, the two arc portions 133, and the two extending portions 136, and the width L2 of the second end surface 132 of the engaging portion 13 is the width of the main portion 134, so in the embodiment of the present invention, the width of the first end surface 131 can be increased by adding the arc portions 133 and the extending portions 136 to the first engaging portion 13, and the contact area between the end plate 1 and the insulating cover can be increased.

In addition, in the present embodiment, the width L3 of the second engagement portion 14 in the end plate 1 is the distance between the two outer end faces 142 of the end plate 1, and L3 ≧ L1.

Specifically, as shown in fig. 8, the first end face 131 of the end plate 1 and the insulating cover may be bonded by a glue material, so as to improve the connection reliability of the two, where the glue material may be a structural glue, and based on this, the first end face 131 of the end plate 1 for connecting with the insulating cover is further provided with a glue overflow groove 131a, and excess structural glue between the insulating cover and the first end face 131 can be located in the glue overflow groove 131 a.

More specifically, the flash groove 131a may be specifically disposed on the body portion 134 of the end plate 1, or may be disposed on the extension portion 136 of the end plate 1, as long as the flash groove is disposed on the first end surface 131 connected to the insulating cover, and the specific disposition position of the flash groove 131a is not limited in the present application.

On the other hand, as shown in fig. 7, the width L3 of the second fitting part 14 is greater than the width L1 of the first fitting part 13 in the width direction Y of the end plate, and since the first fitting part 13 and the second fitting part 14 are arranged in the height direction Z of the end plate, as shown in fig. 8, the height of the first upper end surface 137 of the first fitting part 13 is higher than the height of the second upper end surface 141 of the second fitting part 14, and the mounting hole 11 is provided in the second upper end surface 141, a space for accommodating a fastener is formed between the first upper end surface 137 and the second end surface 141.

In addition, as shown in fig. 8, the side plate 3 may be provided with a flange 31, and the flange 31 extends toward the end surface of the second matching portion 14 away from the insulating cover, and is connected with the second matching portion 14, and may be welded therebetween. The end plate 1 has an outer end face 142 in the width direction Y of the end plate, the outer end face 142 being located at the outermost end of the end plate 1 in the width direction Y of the end plate, and therefore the above-described burring 31 covers at least part of the outer end face 142.

In a specific embodiment, as shown in fig. 9, the central angle of the circular arc portion 133 (the circular arc portion 133 is a structure located within a dashed line frame marked by reference numeral 133 in fig. 9) is β, wherein 50 ° ≦ β ≦ 90 °, for example, the central angle β of the circular arc portion 133 may be 60 °, 70 °, or the like.

In the present embodiment, when the central angle β of the arc portion 133 is too large (for example, greater than 90 °), the distance between the arc portion 133 and the mounting hole 11 is too small, which may occupy the mounting space of the fastener and affect the mounting of the end plate 1, and when the central angle β of the arc portion 133 is too small (for example, less than 50 °), the width L1 of the first end surface 131 is not significantly increased by the arc portion 133, which may cause the insulating cover to be damaged. In the embodiment, when the angle β is greater than or equal to 50 ° and less than or equal to 90 °, the width L1 of the first end surface 131 can be effectively increased, and the fastener can have a sufficient installation space.

Meanwhile, as shown in fig. 9, the distance between the second end surface 132 and the center of the mounting hole 11 along the width direction Y of the end plate is W1, 8mm ≦ W1 ≦ 12mm, for example, W1 may be 9mm, 10mm, or the like.

In this embodiment, the distance W1 between the end of the second end surface 132 in the width direction Y of the end plate and the center of the mounting hole 11 can indicate the mounting space of the fastener, and when the distance is too small, the mounting space of the fastener is too small, and there is a risk that the first engagement portion interferes with the fastener 5, and when the distance is too large, the arc portion 133 cannot effectively increase the width L1 of the first end surface 131. Therefore, the W1 can be appropriately set in consideration of both the installation space of the fastener and the width L1 of the first end surface 131 during actual machining.

As shown in fig. 9, the distance between the extending portion 136 of the first engaging portion (the extending portion 136 is a structure within the broken line frame denoted by reference numeral 136 in fig. 9) and the outer end surface 142 of the second engaging portion 142 in the width direction Y of the end plate is W2, 0 ≦ W2 ≦ 11mm, and for example, W2 may specifically be 2mm, 7mm, or the like.

In this embodiment, when the distance W2 between the extension 136 and the outer end face 142 is too large, the width L1 of the first end face 131 of the first engaging portion is small, which cannot effectively increase the contact area between the first engaging portion and the insulating cover 2, and when W2 is too large, the weight of the end plate 1 is large, which may reduce the energy density of the battery module. Therefore, in the actual working condition, the value of W2 can be reasonably set by comprehensively considering the two factors.

On the other hand, as shown in FIG. 9, the thickness of the extending portion 136 in the thickness direction X of the end plate is W3, 1 mm. ltoreq. W3. ltoreq.3 mm, for example, W3 may be 1.5mm, 2 mm.

In this embodiment, in the machining process, the extending portion 136 needs to have a certain thickness W3, and when the thickness W3 is too small, the strength and rigidity of the extending portion 136 are small, and under the action of an expansion force, the extending portion 136 has a risk of deformation or damage, and the effect of increasing the contact area between the end plate 1 and the insulating cover cannot be achieved; when the thickness W3 is too large, the installation space of the fastener is reduced, and the fastener risks interfering with the extension 136. Therefore, in practical conditions, the thickness of the extension 136 can be set properly by taking the above two factors into consideration.

In the embodiment shown in fig. 10, the end face of the extending portion 136 of the first mating portion 13 in the width direction Y of the end plate is flush with the outer end face 142 of the second mating portion 14, at this time, the distance W2 between the extending portion 136 and the outer end face 142 of the second mating portion 142 is equal to 0, and the width L1 of the first end face 131 of the first mating portion 13 is equal to the width of the end face of the second mating portion 14 connected to the insulating cover. Therefore, the extension 136 in this embodiment can increase the contact area between the end plate 1 and the insulating cover to the maximum, thereby effectively reducing the risk of damage to the insulating cover and improving the safety of the battery module.

In the embodiment shown in fig. 12, the extending portion 136 is provided with a relief portion 136a, and the relief portion 136a is used for relieving the fastener mounted in the mounting hole 11.

In this embodiment, the risk of interference between the fastener and the extending portion 136 can be reduced by providing the avoiding portion 136a, wherein the avoiding portion 136a may be a structure that penetrates the extending portion 136 in the thickness direction X of the end plate; the escape portion 136a may not penetrate the extension portion 136, and in this case, the contact area between the first engagement portion 13 and the insulating cover is large.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (11)

1. An end plate (1) for a battery module (M2), characterized in that the end plate (1) comprises a first fitting portion (13), the first fitting portion (13) being located at an end of the end plate (1) in a height direction (Z) of the end plate;

the first matching part (13) comprises a first end face (131) and a second end face (132) which are oppositely arranged along the thickness direction (X) of the end plate, and the first end face (131) is used for connecting an insulating cover (2) of the battery module (M2);

the width of the first end face (131) is L1, and the width of the second end face (132) is L2 along the width direction (Y) of the end plate;

wherein L1 is more than L2.

2. End plate (1) according to claim 1,

the first fitting portion (13) includes a body portion (134) and an extension portion (136), the extension portion (136) is connected to an end portion of the body portion (134) in the width direction (Y) of the end plate, and an end surface of the extension portion (136) for connecting the insulating cover (2) of the battery module (M2) is flush with an end surface of the body portion (134) for connecting the insulating cover (2) of the battery module (M2).

3. End plate (1) according to claim 2,

along the width direction (Y) of the end plate, the end plate (1) is provided with an outer end face (142) attached to a side plate (3) of the battery module (M2), the distance between the extending part (136) and the outer end face (142) is W2, and W2 is not less than 0 and not more than 11 mm.

4. End plate (1) according to claim 2,

the thickness of the extension part (136) along the thickness direction (X) of the end plate is W3, and W3 is more than or equal to 1mm and less than or equal to 3 mm.

5. The end plate (1) according to claim 2, wherein the end plate (1) further comprises a second fitting portion (14) provided with a mounting hole (11), the first fitting portion (13) being located on at least one side of the second fitting portion (14) in a height direction (Z) of the end plate;

the first matching portion (13) further comprises an arc portion (133), the arc portion (133) is connected to the end portion of the body portion (134) along the width direction (Y) of the end plate (1), and the circle center of the circle where the arc portion (133) is located and the corresponding mounting hole (11) are located on the same side of the arc portion (133).

6. End plate (1) according to claim 5,

the central angle of the circular arc part (133) is beta, wherein the beta is more than or equal to 50 degrees and less than or equal to 90 degrees.

7. End plate (1) according to any of claims 2-6,

an avoiding part (136a) is arranged on the extending part (136), and the avoiding part (136a) is used for avoiding the fastening piece (5) installed in the installation hole (11).

8. End plate (1) according to any of claims 5 to 6,

along the width direction (Y) of the end plate, the distance between the second end face (132) and the circle center of the mounting hole (11) is W1, and W1 is not less than 8mm and not more than 12 mm.

9. A battery module (M2), comprising:

a plurality of battery cells (6);

the end plate (1) according to any of claims 1 to 8; and

an insulating cover (2) located between the plurality of battery cells (6) and the end plate (1);

wherein the first end face (131) is connected to the insulating cover (2).

10. A battery pack (M), characterized in that the battery pack (M) comprises a case (M1) and the battery module (M2) of claim 9, the battery module (M2) being housed in the case (M1).

11. An apparatus (D) using a battery module as a power source, characterized in that the battery module (M2) is the battery module (M2) of claim 9.

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