A battery module and energy storage device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-14
- Publication Date
- 2026-08-11
AI Technical Summary
[0004]本实用新型实施例的目的是提供一种电池模块及储能装置，能够解决相关技术储能装置较厚，以及无法有效控制钢带的预紧力的问题
[0024]在本实用新型实施例中，电池模块包括束缚件、端板及多个电芯。电芯沿第一方向上的尺寸大于电芯沿第二方向上的尺寸，第一方向与第二方向正交，其中，第一方向为电芯的长度方向或宽度方向，第二方向为电芯的厚度方向。多个电芯形成至少两个电芯组，每个电芯组包括至少两个沿第二方向排布的电芯，不同电芯组沿第一方向排布，即电池模块整体的长度方向沿第一方向，而电池模块整体的厚度方向沿第二方向，由于各个电芯在第二方向上的尺寸较小，因此，有利于减小电池模块在厚度方向上的尺寸，减薄电池模块。至少一个电芯组内，沿第二方向的一端设置有端板，束缚件将端板与同一电芯组的电芯固定形成整体，相较于束缚件将全部电芯与端板固定形成电池模块的相关技术而言，以电芯组为单位进行固定，可有效控制束缚件的预紧力，降低束缚件固定过程的工艺难度，电池模块的整体尺寸更容易控制，累积的尺寸偏移量也更小，有利于提升电芯的寿命。此外，相关技术中通常将多个电芯排列一个电芯组，利用一个电芯组的两个端面进行散热；而本申请将多个电芯分成若干电芯组，在每一个电芯组内相邻电芯之间的接触面的法向沿第二方向，每一个电芯组均可利用电芯大面即端面进行散热，相较于相关技术中的方案而言，增加了散热面积，提升了散热效率。
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Figure CN224625766U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of energy storage battery technology, specifically relating to a battery module and energy storage device. Background Technology
[0002] A home energy storage device is a device used in homes to store and manage electrical energy. It is typically used to provide backup power in the event of a power outage or power shortage, storing electrical energy and releasing it when needed. It is easy to use.
[0003] Due to the typically small power capacity of home energy storage devices and consumers' personalized aesthetic demands (such as wall mounting), the thickness of these devices is gradually decreasing, becoming a key focus in the home energy storage industry. However, related technologies generally result in thicker energy storage devices, occupying a large amount of space in the thickness direction, making it difficult to integrate flexibly into the home environment. Furthermore, the use of the same set of steel strips to bind the battery cells makes it difficult to effectively control the preload of the steel strips. Utility Model Content
[0004] The purpose of this utility model embodiment is to provide a battery module and energy storage device that can solve the problems of related technology energy storage devices being too thick and the inability to effectively control the pretension force of the steel strip.
[0005] To solve the above-mentioned technical problems, this utility model is implemented as follows:
[0006] This utility model embodiment provides a battery module, including multiple restraint members, multiple end plates, and multiple battery cells;
[0007] The battery module has a first direction and a second direction that are perpendicular to each other. The second direction is the thickness direction of the battery cell. The size of the battery cell along the first direction is larger than the size of the battery cell along the second direction. Multiple battery cells form at least two battery cell groups. Each battery cell group includes at least two battery cells arranged along the second direction. The contact surface between adjacent battery cells in the same battery cell group is perpendicular to the second direction. Different battery cell groups are arranged along the first direction.
[0008] Each of the battery cell groups is provided with at least one end plate. Along the second direction, the end plate is disposed on at least one end face of the same battery cell group, and the binding member fixes the end plate and the battery cell of the same battery cell group to form an integral whole.
[0009] Optionally, at least one of the battery cells is provided with an end plate at each end along the second direction.
[0010] Optionally, the battery module further includes multiple connecting pieces;
[0011] The battery cell includes a positive electrode and a negative electrode, and the connecting piece is electrically connected between at least the positive electrode of one battery cell and the negative electrode of another adjacent battery cell to connect multiple battery cells in series.
[0012] Optionally, the plurality of connecting pieces include a first connecting piece and a second connecting piece;
[0013] The first connecting piece is electrically connected between two cells in the same cell group, and the second connecting piece is electrically connected between cells in different cell groups.
[0014] Optionally, the battery module has a third direction, which is perpendicular to both the first direction and the second direction. At least one of the battery cells and the end plate are provided with at least two restraining members, which are spaced apart along the third direction.
[0015] Optionally, the battery module further includes a heat insulation component;
[0016] The heat insulation element is disposed between at least two cells in the same cell group.
[0017] Optionally, the connecting piece includes a bent portion;
[0018] The bent portion is located between two adjacent battery cells.
[0019] Optionally, the battery module further includes conductive sheets and a circuit board;
[0020] Each of the connecting pieces is electrically connected to one of the conductive pieces, and each of the conductive pieces is electrically connected to the circuit board.
[0021] Optionally, the battery module further includes a housing;
[0022] The housing has an internal cavity, and the battery cell is fixed inside the cavity.
[0023] This utility model embodiment also provides an energy storage device, including the battery module described in any of the above claims.
[0024] In this embodiment of the invention, the battery module includes a restraint member, an end plate, and multiple battery cells. The dimension of each battery cell along a first direction is larger than its dimension along a second direction. The first and second directions are orthogonal, where the first direction is the length or width direction of the battery cell, and the second direction is the thickness direction of the battery cell. Multiple battery cells form at least two cell groups, each cell group including at least two cells arranged along the second direction. Different cell groups are arranged along the first direction, meaning the overall length direction of the battery module is along the first direction, while the overall thickness direction of the battery module is along the second direction. Since the dimension of each battery cell in the second direction is smaller, this facilitates a reduction in the thickness dimension of the battery module, thus thinning the battery module. In at least one cell group, an end plate is provided at one end along the second direction. A retaining member fixes the end plate to the cells of the same cell group to form a whole. Compared to related technologies where the retaining member fixes all cells to the end plate to form a battery module, fixing by cell group effectively controls the preload of the retaining member, reduces the process difficulty of fixing the retaining member, makes the overall size of the battery module easier to control, and results in smaller accumulated dimensional deviations, which is beneficial to improving cell lifespan. Furthermore, related technologies typically arrange multiple cells into a cell group, utilizing the two end faces of the cell group for heat dissipation. This application divides multiple cells into several cell groups, with the normal direction of the contact surface between adjacent cells within each cell group along the second direction. Each cell group can utilize the large surface area of the cells, i.e., the end face, for heat dissipation. Compared to related technologies, this increases the heat dissipation area and improves heat dissipation efficiency.
[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0026] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0027] Figure 1 This is an isometric view of the battery module provided in this embodiment of the present invention without the housing;
[0028] Figure 2 This is an isometric view of the battery module of this utility model embodiment without the upper housing;
[0029] Figure 3 This is an isometric view of the battery module according to an embodiment of the present invention.
[0030] Explanation of reference numerals in the attached figures:
[0031] 1-Binding component, 2-Battery cell, 20-Battery cell assembly, 3-End plate, 4-Connecting piece, 41-Bending part, 4a-First connecting piece, 4b-First connecting piece, 5-Heat insulation component, 6-Conductive sheet, 7-Circuit board, 8-Box, 81-Upper box, 82-Lower box, 91-Positive lead-out piece, 92-Negative lead-out piece, X-direction - First direction, Y-direction - Second direction, Z-direction - Third direction. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.
[0033] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0034] Example 1
[0035] Please refer to Figure 1 As illustrated, this embodiment provides a battery module including multiple restraint members 1, multiple end plates 3, and multiple battery cells 2. The battery module has a first direction X and a second direction Y that are perpendicular to each other. The second direction Y is the thickness direction of the battery cell 2. The dimension of the battery cell 2 along the first direction X is greater than the dimension of the battery cell 2 along the second direction Y. Multiple battery cells 2 form at least two battery cell groups 20. Each battery cell group 20 includes at least two battery cells 2 arranged along the second direction Y. The contact surface between adjacent battery cells 2 in the same battery cell group 20 is perpendicular to the second direction Y. Different battery cell groups 20 are arranged along the first direction X. Along the second direction Y, the end plate 3 is disposed on at least one end face of the same battery cell group 20. The restraint members 1 fix the end plate 3 to the battery cells 2 of the same battery cell group 20 to form an integral whole.
[0036] Specifically, such as Figure 1As shown, the battery module includes a restraint member 1, an end plate 3, and multiple battery cells 2. The number of battery cells 2 is set to three, four, or more. The battery module has a first direction, a second direction, and a third direction. The first direction X, the second direction Y, and the third direction Z are mutually perpendicular, forming the three axes of a rectangular orthogonal coordinate system. It should be noted that the perpendicularity in this embodiment is not absolute perpendicularity, but rather perpendicularity within a margin of error, such as perpendicularity within a 90° margin of error of ±2°. In this case, the angles between the first direction X, the second direction Y, and the third direction Z are considered to be mutually perpendicular if they are between 88° and 92°. In this embodiment, the first direction is the X direction, the second direction is the Y direction, and the third direction is the Z direction. The dimension of the battery cell 2 along the first direction X is greater than the dimension of the battery cell along the second direction Y. Multiple battery cells 2 form at least two battery cell groups 20. Different battery cell groups 20 are arranged along the first direction, and each battery cell 2 in each battery cell group 20 is arranged along the first direction X. Since the dimension of cell 2 along the first direction is larger than the dimension of cell 2 along the second direction, the first direction X of cell 2 is the length or width direction, and the second direction Y of cell 2 is the thickness direction. In this embodiment, the first direction is the length direction of the cell, and the third direction is the width direction of the cell. The normal of the contact surface between adjacent cells 2 in the same cell group 20 is along the second direction Y. Therefore, the contact surface between adjacent cells 2 in the same cell group 20 is parallel to the plane formed by the first direction X and the third direction Z. That is, the large surfaces of adjacent cells 2 in the same cell group 20 are in contact with each other. However, the large surfaces of cells 2 at both ends of each cell group 20 along the second direction Y can be in contact with the outside or dissipated through the end plate 3. Compared with the related technology of arranging multiple cells 2 in a cell group and using the two end surfaces of a cell group for heat dissipation, this increases the heat dissipation area and improves the heat dissipation efficiency. However, it should be noted that the number of cells 2 in each cell group 20 should not be too large, usually set to two or three, to avoid increasing the thickness of the battery module.
[0037] In addition, such as Figure 1As shown, at least one cell group 20 is provided with an end plate 3. The end plate 3 is disposed on the end face of at least one cell 2. The end plate 3 is used to constrain the cell, resist expansion force, and prevent the cell from being squeezed by external forces. In this embodiment, each cell group 20 has an end plate 3 at both ends of the cell 2 along the second direction Y. Exemplarily, this embodiment provides four cell groups 20, each cell group 20 has two cells 2 and two end plates 3. The restraining member 1 fixes the end plate 3 to the cell 2 of the same cell group 20 to form an integral whole, which is used to prevent cell displacement. At the end of the battery life, the large surface of the cell will expand and protrude. By fixing and constraining it with the restraining member 1, excessive expansion of the cell volume is avoided. It should be noted that in this embodiment, the large surface of the cell 2 is the surface in contact between different cells 2 of the same cell group 20. This surface is the surface with the largest cell area, hence it is called the large surface of the cell. The large surface of the cell is installed facing the wall. In actual use, if the pre-tightening force of the binding member 1 is too large or too small, the battery cell cannot effectively perform at its optimal state. Compared with related technologies that use binding members to fix all battery cells to the end plate to form a battery module, this embodiment fixes the battery cells in units of a small number of battery cells 2, end plates 3, and binding members 1 forming a battery cell group 20. This effectively controls the pre-tightening force of the binding member 1 in each battery cell group 20, reduces the process difficulty of binding member fixing, makes the overall size of the battery module easier to control, and reduces the cumulative dimensional deviation, thereby improving the service life of the battery cells. The binding member 1 includes, but is not limited to, bolt fasteners, binding steel strips, adhesives, fixing frames, or heat shrink tubing, or a combination of at least two of these. This embodiment uses prestressed steel strips, which have high mechanical strength and rigidity. By wrapping the steel strips around the battery cells 2 and end plates 3, the pre-tightening force of the steel strips is controlled within the design range, resulting in better service life performance for the battery cells 2.
[0038] In related technologies, individual battery cells are arranged along the thickness direction and contact each other through large surfaces. However, as the cells age, they gradually become thicker, affecting the accuracy of component design in the cell arrangement direction. The battery module provided in this embodiment comprises at least two cell groups, each cell group including at least two cells arranged along a second direction. Different cell groups are arranged along a first direction, meaning the overall length of the battery module is along the first direction, and the thickness direction is along the second direction. Firstly, this helps reduce the size of the battery module in the thickness direction, making the battery module thinner. Secondly, the normal direction of the contact surface between adjacent cells within each cell group is along the second direction, allowing heat dissipation from one end of each cell group using its large surface area (end face). Compared to related technologies involving large surface contact between individual cells, this increases the heat dissipation area and improves heat dissipation efficiency. Thirdly, fixing the battery module in units of 20, which consist of a small number of battery cells, end plates, and binding components, can effectively control the pre-tightening force of the binding components, reduce the process difficulty of fixing the binding components, facilitate assembly operations, make the overall size of the battery module easier to control, and reduce the accumulated dimensional deviation, which is beneficial to improving the service life of the battery cells.
[0039] Example 2
[0040] In one implementation method, please refer to Figure 1 As shown in the diagram, at least one cell assembly 20 has an end plate 3 at each end along the second direction Y.
[0041] Specifically, such as Figure 1 As shown, at least one cell group 20 has an end plate 3 at each end along the second direction Y. In this embodiment, each cell group 20 has an end plate 3 at each end along the second direction Y. The end plate 3 is in contact with the large surface of the cell 2, and the cells 2 at both ends of each cell group 20 can dissipate heat through the end plate 3. In contrast, in related technologies, only the cells 2 at both ends can dissipate heat through the end plate 3. Compared to related technologies, this embodiment has more end plates 3, increasing the heat dissipation area and improving heat dissipation efficiency.
[0042] Example 3
[0043] In one implementation method, please refer to Figure 1 and Figure 2 As illustrated, the battery module also includes multiple connecting pieces 4; the battery cell 2 includes a positive electrode and a negative electrode, and the connecting piece 4 is electrically connected between the positive electrode of one battery cell 2 and the negative electrode of another adjacent battery cell 2, so as to connect multiple battery cells 2 in series.
[0044] Specifically, such as Figure 1 and Figure 2As shown, the individual battery cells 2 are connected in series, and adjacent battery cells 2 are connected by a connecting piece 4, which connects the positive terminal of one battery cell 2 to the negative terminal of another adjacent battery cell 2. In addition, a positive lead-out piece 91 is connected to the positive output terminal of the battery module, and a negative lead-out piece 92 is connected to the negative output terminal of the battery module for electrical connection with the load to realize the battery charging and discharging function.
[0045] In one embodiment, based on the above embodiment three, the plurality of connecting pieces 4 include a first connecting piece 4a and a second connecting piece 4b; the first connecting piece 4a is electrically connected between two cells 2 in the same cell group 20, and the second connecting piece 4b is electrically connected between cells 2 in different cell groups 20.
[0046] Specifically, the connecting piece 4 has two forms: a first connecting piece 4a and a second connecting piece 4b. The first connecting piece 4a is electrically connected between the positive and negative terminals of two cells 2 in the same cell group 20, and the second connecting piece 4b is electrically connected between the positive and negative terminals of cells 2 in different cell groups 20, so as to connect the cells 2 in different cell groups 20 and the cells 2 in the same cell group 20 in series.
[0047] Example 4
[0048] In one implementation method, please refer to Figure 1 and Figure 2 As illustrated, the battery module has a third direction Z, which is perpendicular to both the first direction X and the second direction Y. At least two restraining members 1 are provided on at least one cell group 20 and the end plate 3, and the at least two restraining members 1 are spaced apart along the third direction Z.
[0049] Specifically, such as Figure 1 and Figure 2 As shown, at least two binding members 1 are tightened and fixed on at least one cell group 20 and its corresponding end plate 3. The binding members 1 of the same cell group 20 are arranged in parallel at intervals and distributed along the third direction Z. In this embodiment, each cell group 20 and its corresponding end plate are provided with binding members 1 at two locations along the third direction Z, which improves the reliability of tightening and fixing.
[0050] Example 5
[0051] In one implementation method, please refer to Figure 1 As illustrated, the battery module also includes a heat insulation component 5; the heat insulation component 5 is disposed between at least two cells 2 in the same cell group 20.
[0052] Specifically, since adjacent cells 2 within the same cell group 20 are in contact with each other via large surfaces, a heat insulation component 5 is sandwiched between at least two adjacent cells 2 within the same cell group 20. When a cell experiences thermal runaway due to overcharging, short circuit, or mechanical damage, it releases a large amount of heat and flammable gas. The heat insulation component 5 prevents other cells in the same cell group 20 from being adversely affected. Simultaneously, the heat insulation component 5 reduces heat conduction between cells, increasing internal resistance and preventing battery performance degradation. The heat insulation component 5 can be made of materials including, but not limited to, aerogel, ceramic fiber, nanoplate, mica plate, phase change material, flame-retardant foam, or glass fiber reinforced material. It should be noted that since the cells 2 in different cell groups 20 are not in direct contact, this embodiment is not limited to providing a heat insulation component 5 between cells 2 in different cell groups 20.
[0053] Example 6
[0054] In one implementation method, based on the above-described Embodiment 3, please refer to... Figure 1 As shown in the diagram, the connecting piece 4 includes a bent portion 41; the bent portion 41 is located between two adjacent battery cells 2.
[0055] Specifically, such as Figure 1 As shown, the connecting piece 4 is provided with a bent portion 41, which is a right-angled protrusion located between two adjacent battery cells 2. This facilitates the absorption of positional displacement caused by assembly errors between different battery cells 2. Compared with a planar structure, the bent portion 41 is more conducive to avoiding stress concentration and preventing damage to the connecting piece 4 caused by the positional displacement of the battery cells 2. Both the first connecting piece 4a and the second connecting piece 4b can be provided with bent portions 41. It should be noted that the attached figure of this embodiment only shows the bent portion 41 on the first connecting piece 4a. The shape and position of the bent portion 41 on the second connecting piece 4b can be used as a reference.
[0056] In one implementation method, based on the above-described Embodiment 3, please refer to... Figure 1 As illustrated, the battery module also includes conductive sheets 6 and circuit boards 7; each connecting piece 4 is electrically connected to one of the conductive sheets 6, and each conductive sheet 6 is electrically connected to the circuit board 7.
[0057] Specifically, such as Figure 1 As shown, the conductive sheet 6 is a nickel sheet, and the circuit board 7 uses FPC (Flexible Printed Circuit). Each connecting piece 4 is electrically connected to the circuit board 7 through the conductive sheet 6. The conductive sheet 6 is used to collect voltage. The battery cell 2, connecting piece 4, conductive sheet 6 and circuit board 7 form a current path to realize the charging and discharging function of the battery.
[0058] In one implementation, based on any of the above embodiments, please refer to... Figure 2 and Figure 3As shown in the diagram, the battery module also includes a housing 8; the housing 8 has an internal cavity in which the battery cell 2 is fixed.
[0059] Specifically, such as Figure 2 and Figure 3 As shown, the battery cell 2, end plate 3, restraint member 1, connecting piece 4, heat insulation member 5, conductive sheet 6, and circuit board 7 are fixed in the receiving cavity of the housing 8. The housing 8 includes an upper housing 81 and a lower housing 82 that are interlocked with each other, forming a receiving cavity between the upper housing 81 and the lower housing 82. The bottom of the battery cell 2 is fixed to the lower housing 82 with thermally conductive adhesive, which fixes the battery cell while improving heat dissipation.
[0060] In some embodiments, the battery module is assembled using the following steps:
[0061] S1. Taking each battery cell group 20 as an example, the binding member 1 and the end plate 3 are used to apply a pre-tightening force to the battery cell 2.
[0062] S2. Weld connecting pieces 4 between the positive and negative poles of adjacent cells 2, and weld conductive pieces 6 between connecting pieces 4 and circuit board 7 to facilitate voltage acquisition.
[0063] S3. Install and fix the battery cell 2 in the housing 8.
[0064] In some embodiments, the preload of the battery cell 2 can be set to a range of 1500N-5000N; specifically, the restraint member 1 can be a steel strip, the elastic modulus E1 of the steel strip and the overall elastic modulus E2 of the battery cell can be calculated, and the preload of the battery cell 2 can be adjusted to a range of 1500N-5000N by adjusting the ratio between E1 and E2.
[0065] Example 7
[0066] In one embodiment, an energy storage device is also provided, including the battery module in any of the above embodiments. When the energy storage device is a household energy storage device, including but not limited to power banks, portable power banks, or emergency power supplies, the product thickness can be reduced, making it easier to integrate into the home environment. Furthermore, the heat dissipation efficiency of the energy storage device can be improved, assembly errors can be reduced, and service life can be extended.
[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.
[0068] The terms "first" and "second" in the specification and claims of this utility model may explicitly or implicitly include one or at least two of the features. In the description of this utility model, unless otherwise stated, "at least two" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0069] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "left", "right", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0070] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0071] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.
Claims
1. A battery module, characterized in that, It includes multiple restraint components (1), multiple end plates (3), and multiple battery cells (2); The battery module has a first direction (X) and a second direction (Y) that are perpendicular to each other. The second direction (Y) is the thickness direction of the cell (2). The size of the cell (2) along the first direction (X) is larger than the size of the cell (2) along the second direction (Y). Multiple cells (2) form at least two cell groups (20). Each cell group (20) includes at least two cells (2) arranged along the second direction (Y). The contact surface between adjacent cells in the same cell group (20) is perpendicular to the second direction (Y). Different cell groups (20) are arranged along the first direction (X). Each of the battery cell groups (20) is provided with at least one end plate (3) along the second direction (Y). The end plate (3) is disposed on at least one end face of the same battery cell group (20). The binding member (1) fixes the end plate (3) and the battery cell (2) of the same battery cell group (20) to form an integral whole.
2. The battery module according to claim 1, characterized in that, At least one of the battery cell groups (20) is provided with an end plate (3) at each end along the second direction (Y).
3. The battery module according to claim 1, characterized in that, The battery module also includes multiple connecting pieces (4); The battery cell (2) includes a positive electrode and a negative electrode, and the connecting piece (4) is electrically connected between at least the positive electrode of one battery cell (2) and the negative electrode of another adjacent battery cell (2) to connect multiple battery cells (2) in series.
4. The battery module according to claim 3, characterized in that, The plurality of connecting pieces (4) include a first connecting piece (4a) and a second connecting piece (4b); The first connecting piece (4a) is electrically connected between two cells (2) in the same cell group (20), and the second connecting piece (4b) is electrically connected between cells (2) in different cell groups (20).
5. The battery module according to claim 1, characterized in that, The battery module has a third direction (Z), which is perpendicular to both the first direction (X) and the second direction (Y). At least two restraint members (1) are provided on at least one of the battery cell groups (20) and the end plate (3), and the at least two restraint members (1) are spaced apart along the third direction (Z).
6. The battery module according to claim 1, characterized in that, The battery module also includes a heat insulation component (5); The heat insulation element (5) is disposed between at least two cells (2) of the same cell group (20).
7. The battery module according to claim 3, characterized in that, The connecting piece (4) includes a bent portion (41); The bent portion (41) is located between two adjacent cells (2).
8. The battery module according to claim 3, characterized in that, The battery module also includes a conductive sheet (6) and a circuit board (7); Each of the connecting pieces (4) is electrically connected to one of the conductive pieces (6), and each of the conductive pieces (6) is electrically connected to the circuit board (7).
9. The battery module according to any one of claims 1 to 8, characterized in that, The battery module also includes a housing (8); The housing (8) has an internal cavity, and the battery cell (2) is fixed inside the cavity.
10. An energy storage device, characterized in that, Includes the battery module as described in any one of claims 1-9.