Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment, the battery pack comprises a battery cell group and supporting assemblies, the battery cell group comprises a plurality of battery cells arranged in a stacked mode, the number of the supporting assemblies is two, and the two supporting assemblies are arranged on the two sides of the battery cell group respectively in the stacking direction of the multiple battery cells; the supporting assembly comprises an expansion beam, an elastic piece and a movable piece, the movable piece is attached to the battery cell group, the elastic piece is arranged between the expansion beam and the movable piece, and the elastic piece is used for providing constant pressure for the movable piece so that the movable piece can abut against the battery cell group. Through the technical scheme, the battery pack provided by the utility model can prevent the expansion beams from being extruded and damaged, and can also prevent the battery cells from being extruded and damaged, so that the service life of the battery pack is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and particularly to a battery pack and an electrical device. Background Art

[0002] A battery pack connects multiple battery cells in series or in parallel to obtain the required voltage and current. However, during the use of the battery, the battery cells may expand and deform, generating an expansion force to squeeze the expansion beam. If the expansion force is too large, it may cause the expansion beam to deform or be damaged, or cause the battery cells to be squeezed and damaged, affecting the service life of the battery pack. Summary of the Utility Model

[0003] The purpose of the present disclosure is to provide a battery pack and an electrical device. The battery pack can avoid the expansion beam from being squeezed and damaged, and can also avoid the battery cells from being squeezed and damaged to improve the service life of the battery pack.

[0004] To achieve the above object, according to the first aspect of the present disclosure, there is provided a battery pack including a battery cell group and a support assembly. The battery cell group includes a plurality of battery cells arranged in a stack. The support assembly is provided in two groups, and the two groups of support assemblies are respectively arranged on both sides of the battery cell group along the stacking direction of the plurality of battery cells. The support assembly includes an expansion beam, an elastic member, and a movable member. The movable member is in contact with the battery cell group. The elastic member is arranged between the expansion beam and the movable member, and the elastic member is used to provide a constant pressure to the movable member to press the movable member against the battery cell group.

[0005] Optionally, the expansion beam is provided with a buffer cavity adapted for the movable member to be inserted into.

[0006] Optionally, the elastic member is configured as a constant force spring.

[0007] Optionally, at least one group of constant force spring groups is arranged between the movable member and the expansion beam, and each group of constant force spring groups includes at least one constant force spring.

[0008] Optionally, one group of constant force spring groups is arranged between the movable member and the expansion beam. The constant force spring group includes a plurality of constant force springs arranged coaxially, or the constant force spring group includes one constant force spring.

[0009] Optionally, the movable member is configured as a plate shape, and the central axis of the constant force spring in the constant force spring group is collinear with the central axis of the movable member.

[0010] Optionally, a plurality of sets of constant force spring groups are arranged between the movable member and the expansion beam, and the plurality of sets of constant force spring groups are arranged at intervals in an array. Each set of constant force spring groups includes one constant force spring, or each set of constant force spring groups includes a plurality of constant force springs arranged coaxially.

[0011] Optionally, the constant force spring has opposite first and second ends, and the radial dimension of the constant force spring gradually decreases from the first end towards the second end. The first end faces the movable member, and the second end faces the expansion beam.

[0012] Optionally, the movable member is provided with a mounting groove for accommodating the first end of the constant force spring, and the radial dimension of the mounting groove is larger than the radial dimension of the first end.

[0013] Optionally, a mounting post is provided on one side of the expansion beam facing the movable member, and the constant force spring is sleeved on the mounting post and the second end of the constant force spring abuts against the expansion beam.

[0014] According to a second aspect of the present disclosure, there is provided an electrical device, and the electrical device includes the above battery pack.

[0015] Through the above technical solutions, in the battery pack provided by the present disclosure, a support assembly is arranged on each of the two sides of the battery cell group in the stacking direction, and the movable member in the support assembly can press against the battery cell group. In this way, when the battery cell expands and deforms, the battery cells near the two sides of the battery cell group will push the movable member towards the elastic member in the stacking direction, so that the movable member squeezes the elastic member. Therefore, the elastic member will undergo elastic deformation. The battery pack provided by the present disclosure can prevent the battery cells from directly squeezing the expansion beam and causing damage to the expansion beam. In addition, the elastic member is used to provide a constant pressure to the movable member, that is, when the battery cells in the battery cell group expand and deform, the pressure exerted by the movable member on the battery cell group can remain constant, so as to avoid excessive pressure exerted by the movable member on the battery cell group and causing damage to the battery cells, and can improve the service life of the battery pack.

[0016] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. They are used to explain the present disclosure together with the following specific implementation, but do not constitute a limitation to the present disclosure. In the drawings:

[0018] Figure 1 is an exploded perspective view of a battery cell and an expansion beam provided by an embodiment of the present disclosure;

[0019] Figure 2 is an exploded side view of a battery cell and an expansion beam provided by an embodiment of the present disclosure;

[0020] Figure 3 is an exemplary embodiment of an arrangement mode of elastic members provided by an embodiment of the present disclosure;

[0021] Figure 4 is another exemplary embodiment of an arrangement mode of elastic members provided by an embodiment of the present disclosure;

[0022] Figure 5 is a relationship curve graph of the deformation amount and the contact force of the elastic member under two other arrangement modes provided by an embodiment of the present disclosure.

[0023] Description of Reference Numerals

[0024] 100, support assembly; 110, expansion beam; 111, buffer cavity; 120, elastic member; 121, first end; 122, second end; 130, movable member; 200, battery cell. Detailed Description of the Embodiment

[0025] The following will describe the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0026] In the present disclosure, unless otherwise stated, the terms "first", "second", etc. used in the present disclosure are used to distinguish one element from another element, and do not have sequentiality and importance. In addition, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure, and should not be construed as a limitation to the present disclosure.

[0027] According to a first aspect of the present disclosure, a battery pack is provided. The battery pack includes a battery cell group and a support assembly 100. The battery cell group includes a plurality of battery cells 200 arranged in a stacked manner. The support assembly 100 is provided in two groups, and the two groups of support assemblies 100 are respectively arranged on both sides of the battery cell group along the stacking direction of the plurality of battery cells 200. The support assembly 100 includes an expansion beam 110, an elastic member 120, and a movable member 130. The movable member 130 is attached to the battery cell group. The elastic member 120 is arranged between the expansion beam 110 and the movable member 130, and the elastic member 120 is used to provide a constant pressure to the movable member 130 to press the movable member 130 against the battery cell group.

[0028] Through the above technical solution, in the battery pack provided by the present disclosure, a support assembly 100 is arranged on each of the two sides of the battery cell group along the stacking direction, and the movable member 130 in the support assembly 100 can press against the battery cell group. In this way, when the battery cell 200 expands and deforms, the battery cells 200 near both sides of the battery cell group will push the movable member 130 along the stacking direction towards the elastic member 120, so that the movable member 130 squeezes the elastic member 120. Therefore, the elastic member 120 will undergo elastic deformation. The battery pack provided by the present disclosure can prevent the battery cell 200 from directly squeezing the expansion beam 110 and causing damage to the expansion beam 110 due to extrusion. In addition, the elastic member 120 is used to provide a constant pressure to the movable member 130. That is to say, when the battery cells 200 in the battery cell group expand and deform, the pressure exerted by the movable member 130 on the battery cell group can remain constant, so as to avoid excessive pressure exerted by the movable member 130 on the battery cell group and causing damage to the battery cell, and can improve the service life of the battery pack.

[0029] Among them, two sets of support assemblies 100 are provided, and the two sets of support assemblies 100 are respectively arranged on both sides of the battery cell group along the stacking direction of multiple battery cells 200. In this way, on the one hand, it can ensure that the forces on both sides of the battery cell group are balanced; on the other hand, it can protect the expansion beams located on both sides of the battery cell group at the same time. In addition, since the battery cells 200 in the middle of the battery cell group will be bonded to the installation structure of the battery during the installation process of the battery cells 200, the above setting of the support assembly 100 can ensure that the battery cells 200 located on both sides of the battery cell group can be supported by the support assembly.

[0030] In the battery pack provided by the present disclosure, the expansion beam 110 and the movable member 130 can be installed in any suitable manner. As an exemplary embodiment, referring to Figure 1 as shown in, the expansion beam 110 can be provided with a buffer cavity 111, and the buffer cavity 111 is suitable for the movable member 130 to be embedded. In this way, by providing the buffer cavity 111, the movable member 130 can move in the buffer cavity 111 and squeeze the elastic member 120, so that the elastic member 120 undergoes elastic deformation, and it can prevent the movable member 130 from directly squeezing the expansion beam 110 and causing deformation and damage to the expansion beam 110. Among them, the cross-section of the buffer cavity 111 can be constructed into a shape adapted to the movable member 130, such as a circle, a polygon, etc., to ensure that the movable member 130 can only move along the depth direction of the buffer cavity 111 (i.e., the stacking direction of multiple battery cells 200).

[0031] In the battery pack provided by the present disclosure, the elastic member 120 can be constructed in any suitable manner. As an exemplary embodiment, referring to Figures 2 to 4As shown, the elastic member 120 can be configured as a constant force spring. In this way, when the battery cell 200 expands and deforms, the constant force spring can provide a constant pressure to the movable member 130, so as to prevent the elastic force of the elastic member 120 from continuously increasing as the elastic deformation amount increases, and avoid the phenomenon that the battery cell 200 is damaged by excessive elastic force. In other embodiments, the elastic member 120 can also be configured in other suitable ways to provide a constant pressure to the movable member 130. The present disclosure does not make specific limitations on this.

[0032] In the battery pack provided by the present disclosure, the constant force spring can be arranged in any suitable way. As an exemplary embodiment, refer to Figures 2 to 4 As shown, at least one set of constant force spring groups is arranged between the movable member 130 and the expansion beam 110, and each set of constant force spring groups includes at least one constant force spring. Among them, the number of constant force spring groups, and the number of constant force springs in each set of constant force spring groups can be reasonably designed according to the actual requirements of the battery pack. The present disclosure does not make specific limitations on this. Only four arrangement ways of the constant force spring are provided below by way of example.

[0033] As an exemplary embodiment of the first arrangement way of the constant force spring provided by the present disclosure, refer to Figure 3 As shown, one set of constant force spring groups can be arranged between the movable member 130 and the expansion beam 110, and the constant force spring groups can include a plurality of constant force springs arranged coaxially. Among them, Figure 3 Only three constant force springs included in the constant force spring groups are taken as an example in order to facilitate understanding, which does not constitute a limitation to the present disclosure. In other embodiments, the constant force spring groups can also include other numbers of constant force springs, such as two, four, five, etc. The present disclosure does not make specific limitations on this.

[0034] As an exemplary embodiment of the second arrangement way of the constant force spring provided by the present disclosure, refer to Figure 2 As shown, one set of constant force spring groups can be arranged between the movable member 130 and the expansion beam 110, and the constant force spring groups can include one constant force spring.

[0035] In the above first and second embodiments, the movable member 130 can be configured as a plate shape, and the central axis of the constant force spring in the constant force spring group can be collinear with the central axis of the movable member 130. The design of the movable member 130 configured as a plate shape can facilitate the force of the constant force spring acting on the movable member 130 to be dispersed through the movable member 130 to the entire contact surface between the movable member 130 and the battery cell 200. Among them, the movable member 130 can be configured in a shape (such as a rectangle) adapted to the end face of the battery cell 200, so as to ensure that the expansion deformation of the battery cell 200 can fully act on the movable member 130. In addition, it should be noted that when the movable member 130 is rectangular, the center of gravity of the movable member 130 is exactly located on the central axis of the movable member 130. Therefore, the design of "the central axis of the constant force spring is collinear with the central axis of the movable member 130" can prevent the movable member 130 from tipping over relative to the constant force spring, so as to ensure the reliability of the support assembly 100. When the movable member 130 is of other shapes, the center of gravity of the movable member 130 can be arranged on the central axis of the constant force spring.

[0036] As an exemplary embodiment of the third arrangement method of the constant force spring provided by the present disclosure, referring to Figure 4 as shown in, multiple constant force spring groups can be arranged between the movable member 130 and the expansion beam 110. The multiple constant force spring groups can be arranged at intervals in an array, and each constant force spring group can include one constant force spring.

[0037] As an exemplary embodiment of the fourth arrangement method of the constant force spring provided by the present disclosure (not shown in the figure), multiple constant force spring groups can be arranged between the movable member 130 and the expansion beam 110. The multiple constant force spring groups can be arranged at intervals in an array, and each constant force spring group can include a plurality of coaxially arranged constant force springs. Among them, each constant force spring group can include the same number of constant force springs. As an exemplary embodiment, the number of constant force springs in each constant force spring group can be two, three, four, etc., and the present disclosure does not make specific limitations thereon; or, as another exemplary embodiment, each constant force spring group can include different numbers of constant force springs, such as the number of constant force springs in the constant force spring group in the central region can be different from the number of constant force springs in the constant force spring group in the peripheral region, and the present disclosure does not make specific limitations thereon.

[0038] In the above third and fourth embodiments, the array formed by the multiple constant force spring groups can be in the form of one row or one column, or can also adopt the form of multiple rows and multiple columns. The present disclosure does not make specific limitations thereon. In other embodiments, the multiple constant force spring groups can also be arranged in a triangle, or a circular array, etc., and the present disclosure does not make specific limitations thereon.

[0039] Among them, when the constant force springs adopt different arrangement methods, the support effects of the obtained support assembly 100 will also be different. Refer to Figure 5As shown, the relationship between the deformation of the constant force spring and the contact force exerted by the constant force spring on the movable member 130 in two arrangement modes is provided. Among them, the arrangement mode of the constant force spring corresponding to curve a is that the number of constant force spring groups is one group, and the constant force spring group includes one constant force spring; the arrangement mode of the constant force spring corresponding to curve b is that the number of constant force spring groups is three groups, and each constant force spring group includes one constant force spring, and the three constant force spring groups are arranged in a row. In summary, when the deformation of the constant force spring is the same, the contact force generated by the three constant force springs arranged in a row is greater than the contact force generated by one constant force spring. In another embodiment, the contact force generated when the same number of constant force springs are stacked coaxially is less than the contact force generated when the same number of constant force springs are arranged in an array. Therefore, the constant force springs under different arrangement modes can generate different contact forces when the deformation is the same. During the production of the battery, the constant force springs can be reasonably arranged according to actual needs, and the present disclosure does not make specific limitations on this.

[0040] In the battery pack provided by the present disclosure, the constant force spring can be installed in any suitable manner. As an exemplary embodiment, referring to Figure 1 and Figure 2 as shown, the constant force spring can have opposite first end 121 and second end 122. The radial dimension of the constant force spring can gradually decrease from the first end 121 towards the second end 122. The first end 121 can face the movable member 130, and the second end 122 can face the expansion beam 110. In this way, it can be ensured that the contact area between the constant force spring and the movable member 130 is as large as possible to ensure the supporting effect of the constant force spring on the movable member 130.

[0041] In the battery pack provided by the present disclosure, the constant force spring and the movable member 130 can be installed in any suitable manner. As an exemplary embodiment, referring to Figure 1 and Figure 2 as shown, the movable member 130 can be provided with an installation groove for accommodating the first end 121 of the constant force spring, and the radial dimension of the installation groove is larger than the radial dimension of the first end 121. In this way, the constant force spring can be installed in the installation groove to prevent the constant force spring from slipping relative to the movable member 130. In addition, the radial dimension of the installation groove is larger than the radial dimension of the first end 121, which can prevent the installation groove from restricting the deformation of the constant force spring.

[0042] In the battery pack provided by the present disclosure, the constant force spring and the expansion beam 110 can be installed in any suitable manner. As an exemplary embodiment, referring to Figure 1 and Figure 2As shown in the figure, on the side of the expansion beam 110 facing the movable member 130, there are mounting posts. The constant force spring is sleeved on the mounting posts, and the second end 122 of the constant force spring abuts against the expansion beam 110. By providing the mounting posts, it is convenient to position the constant force spring during the installation process of the constant force spring, which is beneficial to assembly. In this embodiment, the dimension of the mounting post in the stacking direction of the plurality of battery cells is L1, and the dimension of the constant force spring in the stacking direction of the plurality of battery cells during compression deformation is L2, where L1 and L2 satisfy the following relationship: L1 < L2. In this way, it is possible to prevent the mounting post from restricting the deformation of the constant force spring.

[0043] According to a second aspect of the present disclosure, there is provided an electrical device, which includes the above battery pack. As an exemplary embodiment, the electrical device may be a vehicle, and the present disclosure does not make specific limitations thereto.

[0044] During the use of the battery pack provided by the present disclosure, the battery cells will expand, causing the movable member 130 to move towards the expansion beam 110 in the stacking direction. During this process, the elastic member 120 between the expansion beam 110 and the movable member 130 can provide a constant pressure to the movable member 130, so that the movable member 130 can play a role in supporting the battery cell group.

[0045] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0046] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure does not separately describe various possible combination methods.

[0047] In addition, any combination can be made between the various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A battery pack, characterized in that: The battery pack comprises a cell group and a support assembly, wherein the cell group comprises a plurality of cells arranged in a stacked manner, and the support assembly is provided in two groups, and the two groups of support assemblies are respectively arranged on both sides of the cell group along the stacking direction of the plurality of cells, The support assembly includes an expansion beam, an elastic member and a movable member, the movable member is fitted with the battery cell group, the elastic member is arranged between the expansion beam and the movable member, and the elastic member is used to provide a constant pressure to the movable member to press the movable member against the battery cell group.

2. The battery pack according to claim 1, characterized in that: The expansion beam is provided with a buffer cavity, and the buffer cavity is suitable for the movable part to be embedded.

3. The battery pack according to claim 1, characterized in that: The elastic member is configured as a constant force spring.

4. The battery pack according to claim 3, characterized in that: At least one group of constant force springs is arranged between the movable member and the expansion beam, and each group of the constant force springs includes at least one constant force spring.

5. The battery pack according to claim 4, characterized in that: A group of the constant force spring group is arranged between the movable part and the expansion beam, and the constant force spring group includes a plurality of the constant force springs arranged coaxially, or the constant force spring group includes one constant force spring.

6. The battery pack according to claim 5, characterized in that: The movable member is plate-shaped, and the central axis of the constant force spring in the constant force spring group is colinear with the central axis of the movable member.

7. The battery pack according to claim 4, characterized in that: A plurality of constant force spring groups are arranged between the movable member and the expansion beam, and the plurality of constant force spring groups are arranged in an array and spaced apart from each other. Each group of the constant force springs includes one constant force spring, or each group of the constant force springs includes a plurality of the constant force springs arranged coaxially.

8. The battery pack according to any one of claims 3 to 7, characterized in that: The constant force spring has a first end and a second end opposite to each other. The radial dimension of the constant force spring gradually decreases from the first end toward the second end. The first end faces the movable member, and the second end faces the expansion beam.

9. The battery pack according to claim 8, characterized in that: The movable member is provided with a mounting groove, the mounting groove is used to accommodate the first end of the constant force spring, and the radial dimension of the mounting groove is greater than the radial dimension of the first end.

10. The battery pack according to claim 9, characterized in that: A mounting column is arranged on one side of the expansion beam facing the movable part, the constant force spring is sleeved on the mounting column and the second end of the constant force spring abuts against the expansion beam.

11. An electrical device, characterized in that: The electrical device comprises a battery pack according to any one of claims 1-10.

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