Battery module and energy storage system

Abstract

The utility model provides a battery module and an energy storage system, and the battery module comprises one or more battery cell groups, each battery cell group comprises a plurality of battery cells cascaded along a first direction; a first end plate and a second end plate, the one or more battery cell groups are located between the first end plate and the second end plate, the first end plate and the second end plate are both provided with end plate upper end surfaces, and the end plate upper end surfaces comprise one or more end plate fixing parts; each fixing strip is provided with an extending part extending in the first direction and connecting parts located at the two ends of the extending part, and the connecting parts at the two ends of each extending part are suitable for being fixedly connected with the end plate fixing parts on the end plate upper end faces of the first end plate and the second end plate respectively; and the one or more insulating sheets are positioned between the first side surface of the battery cell group and each fixing strip. According to the battery module and the energy storage system provided by the invention, the occupied space of the battery module can be saved, and the volume energy density of the battery module is improved, so that the manufacturing cost of the energy storage system is reduced.

Description

Technical Field

[0001] This application mainly relates to the technical field of electrochemical energy storage, and particularly relates to a battery module and an energy storage system. Background Art

[0002] The development of the power and energy storage industries has brought great opportunities for the development of power battery vehicles and battery energy storage; the packaging technology of cell groups and battery modules is a key technology in the battery field. The current mainstream solution in the energy storage industry is to stack battery modules and then install them on a liquid cooling plate, and then install various components to form a PACK box body, and multiple PACKs form an energy storage system. Each PACK has an upper cover plate and a liquid cooling plate. Currently, in the field, the temperature of the cells is generally reduced by setting liquid cooling components. Therefore, liquid cooling pipelines need to be configured in the energy storage system to connect the liquid cooling plates of all PACKs in series, resulting in a relatively high cost of the energy storage system.

[0003] The current mainstream battery module stacking solution is to assemble and fix the cell group and then install it on the liquid cooling plate, and then install the upper cover plate to form a battery pack. The mainstream stacking method makes the structure of the battery module complex, thus occupying too much space and reducing the volume energy density of the battery module, and also further increasing the cost of the energy storage system due to the complex structure.

[0004] Therefore, there is an urgent need in this field for a battery module that can save the occupied space of the battery module, improve the volume energy density of the battery module, and reduce the cost of the energy storage system. Summary of the Utility Model

[0005] The technical problem to be solved by this application is to provide a battery module and an energy storage system, which can save the occupied space of the battery module, improve the volume energy density of the battery module, and thus reduce the cost of the energy storage system.

[0006] To solve the above technical problems, the present application provides a battery module, comprising: one or more battery cell groups, each of the battery cell groups comprising a plurality of battery cells cascaded in a first direction; a first end plate and a second end plate, located at a first end and a second end of the battery module opposite to each other in the first direction, the one or more battery cell groups being located between the first end plate and the second end plate, both the first end plate and the second end plate having an upper end face of the end plate, the upper end face of the end plate comprising one or more end plate fixing parts; one or more fixing bars, located above a first side face of the battery cell group, each of the fixing bars having an extension part extending in the first direction and connecting parts located at both ends of the extension part, the connecting parts at both ends of each extension part being adapted to be fixedly connected to the end plate fixing parts on the upper end face of the first end plate and the second end plate respectively; and one or more insulating sheets, the insulating sheets being located between the first side face of the battery cell group and each of the fixing bars, the width of the insulating sheets in a second direction perpendicular to the first direction being greater than or equal to the width of the fixing bars in the second direction.

[0007] Optionally, the battery module further comprises one or more groups of battery cell end plates, each group of the battery cell end plates comprising a first battery cell end plate and a second battery cell end plate opposite to each other in the first direction, each of the first battery cell end plate and the second battery cell end plate being fixedly connected to a second side face of each of the battery cell groups close to the first end plate and the second end plate respectively.

[0008] Optionally, the plurality of battery cells and / or between the battery cell groups and the first battery cell end plate and the second battery cell end plate are adhesively connected by aerogel and / or foam tape.

[0009] Optionally, the battery module further comprises one or more steel belts, each of the steel belts surrounding the battery cell group, and when the steel belt surrounds the battery cell group, the extending direction of the steel belt on the first side face is parallel to the first direction.

[0010] Optionally, the insulating sheet is also located between the first side face of the battery cell group and each of the steel belts.

[0011] Optionally, the battery module further comprises a CCS component, the battery module having two opposite module side faces in the second direction, and the CCS component is fixedly connected to each of the module side faces.

[0012] Optionally, the battery module further comprises one or more fasteners, and each of the end plate fixing parts is provided with a fixing part through hole adapted for the fastener to pass through, and the fixing bar is adapted to be fixedly connected to the end plate fixing part through the fastener.

[0013] Optionally, the battery module further comprises a covering sheet, the covering sheet being located on the first side face of the battery cell group and at least covering the exposed area of the first side face.

[0014] Optionally, the covering sheet includes a polymer phase change material, and the polymer phase change material includes a solid-solid phase change material and / or a solid-liquid phase change material.

[0015] Optionally, the solid-solid phase change material includes an alkane material, an inorganic salt, a polyol material, and / or a cross-linked high-density polyethylene material, and the solid-liquid phase change material includes sodium sulfate, sodium acetate, calcium chloride, disodium hydrogen phosphate, carbonate, nitrate, sodium chloride, lithium fluoride, paraffin, and / or fatty acid material.

[0016] To solve the above technical problems, the present application provides an energy storage system, including a plurality of battery modules as described above.

[0017] Compared with the prior art, the present application firstly reduces the structure of the upper cover plate on the battery module, and instead uses a fixing strip to fix the battery cell group. Secondly, the structure of the liquid cooling plate and the liquid cooling unit is not provided on the battery module, but instead a fireproof and flame-retardant material such as aerogel is used to realize the connection of each battery cell in the battery module, saving the occupied space of the battery module, improving the volume energy density of the battery module, and thus further reducing the manufacturing cost of the energy storage system composed of the battery modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Including the drawings is to provide a further understanding of the present application. They are incorporated and constitute a part of the present application. The drawings illustrate embodiments of the present application and, together with this specification, serve to explain the principles of the present application. In the drawings:

[0019] Figure 1 is a schematic structural diagram of a battery module from a front perspective in an embodiment of the present application;

[0020] Figure 2 is as in the present application Figure 1 is a schematic structural diagram of a battery module from a back perspective in the embodiment shown;

[0021] Figure 3 is as in the present application Figure 1 is a schematic structural diagram of a battery cell group in a battery module from a top-down perspective in the embodiment shown;

[0022] Figure 4 is as in the present application Figure 1 is a schematic structural diagram of a battery cell group in a battery module from a side perspective from below in the embodiment shown;

[0023] Figures 5 - 6 is as in the present application Figure 1 is a schematic structural diagram of a CCS component in a battery module in the embodiment shown;

[0024] Figure 7 is as in the present applicationFigure 1 Schematic diagram of the structure of the battery cell group and the battery cell end plate in an embodiment shown

[0025] Figure 8 This application is as Figure 1 Schematic diagram of the structure of the bottom bracket in an embodiment shown

[0026] Reference numerals

[0027] Battery module 10

[0028] Battery cell group 101

[0029] First end plate 102

[0030] Second end plate 103

[0031] Fixing strip 104

[0032] Insulating sheet 105

[0033] First direction X

[0034] Second direction Y

[0035] Upper end face of the end plate 106

[0036] End plate fixing part 107

[0037] Fastener 111

[0038] Through hole of the fixing part 112

[0039] First side S1

[0040] Extension part 1041

[0041] Connection part 1042

[0042] Battery cell end plate 108

[0043] First battery cell end plate 1081

[0044] Second battery cell end plate 1082

[0045] Second side S2

[0046] Steel strip 109

[0047] CCS component 110

[0048] First CCS component 1101

[0049] Second CCS component 1102

[0050] Module side S3

[0051] Cover sheet 113

[0052] Bottom bracket 114

[0053] Limit insulating sheet 115

[0054] Fuse 116

[0055] Copper busbar 117

[0056] Positive and negative electrode base 118

[0057] Electric core 1011 Specific implementation manner

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0059] As shown in the present application and the claims, unless the context clearly indicates an exception, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0060] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but in appropriate cases, the said technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0061] In the description of the present application, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary explanation, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0062] For ease of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc. can be used here to describe the spatial positional relationship of a device or feature shown in the drawings with respect to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0063] In addition, it should be noted that the use of terms such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional declaration, the above terms have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present application. In addition, although the terms used in the present application are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein. In addition, it is required to understand the present application not only through the actual terms used, but also through the meaning implied by each term.

[0064] The present application refers to Figures 1 - 4 A battery module 10 is proposed. Figure 1 FIG. shows a schematic structural view of the front perspective of the battery module 10; Figure 2 FIG. shows as Figure 1 shown a schematic structural view of the rear perspective of the battery module 10; Figure 3 FIG. shows as Figure 1 shown a schematic structural view of the cell group in the battery module 10 in a top-down perspective; Figure 4 FIG. is a schematic view showing as Figure 1Schematic structural diagram of the battery module 10 shown in a perspective view with the battery cell group facing downwards.

[0065] In this embodiment, the battery module 10 includes a battery cell group 101, a first end plate 102, a second end plate 103, three fixing bars 104, and three insulating sheets 105. Exemplarily, in other embodiments of the present application, the battery module may include one or more battery cell groups 101, one or more fixing bars 104, and one or more insulating sheets 105. The present application is not limited by the number of the component structures as shown in Figure 1 and Figure 2 the figures.

[0066] Specifically, each battery cell group 101 includes a plurality of battery cells cascaded along the first direction X; the first end plate 102 is located at the first end of the battery module 10 along the first direction X, and the second end plate 103 is located at the second end of the battery module 10 along the first direction X. The first end and the second end are oppositely arranged in the first direction X, and two battery cell groups 101 are located between the first end plate 102 and the second end plate 103. Both the first end plate 102 and the second end plate 103 have an upper end face 106 of the end plate, and the upper end face 106 of the end plate includes three end plate fixing parts 107. Exemplarily, the battery module 10 may include one or more battery cell groups 101. When there are multiple battery cell groups 101 in the battery module 10, the multiple battery cell groups 101 can be connected by bonding a fireproof and heat-insulating part.

[0067] In this embodiment, the fixing bar 104 is located above the first side surface S1 of the battery cell group 101. Each fixing bar 104 has an extension part 1041 extending along the first direction X and connecting parts 1042 located at both ends of the extension part 1041. The connecting parts 1042 at both ends of each extension part 1041 are adapted to be fixedly connected to the end plate fixing parts 107 of the upper end face 106 of the first end plate 102 and the second end plate 103 respectively.

[0068] Further exemplarily, the battery module 10 in this embodiment further includes a plurality of fasteners 111, and each end plate fixing part 107 is provided with a fixing part through hole 112 adapted for the fastener 111 to pass through. The fixing bar 104 is adapted to be fixedly connected to the end plate fixing part 107 through the fastener 111. Exemplarily, the fastener 111 may be a bolt.

[0069] On the other hand, the insulating sheet 105 is located between the first side surface S1 of the battery cell group 101 and each fixing strip 104, and the width of the insulating sheet 105 in the second direction Y perpendicular to the first direction X is greater than or equal to the width of the fixing strip in the second direction Y. Exemplarily, the fixing strip 104 is a metal structure, and the insulating sheet 105 can insulate the fixing strip 104 and the battery cell group 101, preventing the fixing strip 104 and the battery cells in the battery cell group 101 from reacting to affect the working efficiency of the battery module 10. In this embodiment, the fixing strip 104 has two bending portions 1043, and the arrangement of the bending portions 1043 can enhance the fixing strength of the fixing strip 104.

[0070] More specifically, referring to Figure 3 and Figure 4 , as Figure 3 and Figure 4 shown, the battery module 10 further includes two groups of battery cell end plates 108. Each group of battery cell end plates 108 includes a first battery cell end plate 1081 and a second battery cell end plate 1082 that are opposite to each other in the first direction X. Each first battery cell end plate 1081 is fixedly connected to the second side surface S2 of each battery cell group 101 close to the first end plate 102, and the second battery cell end plate 1082 is fixedly connected to the second side surface S2 of each battery cell group 101 close to the second end plate 102.

[0071] In this embodiment, the multiple battery cells 1011 in the battery cell group 101 are adhesively connected by aerogel and / or foam tape, and the battery cell group 101 is adhesively connected to the first battery cell end plate 1081 and the second battery cell end plate 1082 by aerogel and / or foam tape. Preferably, the multiple battery cells 1011 in the battery cell group 101, and the battery cell group 101 and the first battery cell end plate 1081 and the second battery cell end plate 1082 are adhesively connected by aerogel. The aerogel is a fireproof material, which can be flame-retardant when the battery module has a thermal runaway or a fire, inhibit the occurrence of thermal runaway of the battery module 10, and increase the fireproof and heat-insulating ability of the battery module 10. The "and / or" relationship between two or more features in this application text means any one of the two or more features, or any combination of any two or more. For example, the battery cell group 101 is adhesively connected to the first battery cell end plate 1081 and the second battery cell end plate 1082 by aerogel and / or foam tape means that the battery cell group 101 can be adhesively connected to the first battery cell end plate 1081 by aerogel or foam tape, or can use both aerogel and foam tape for adhesion. The "and / or" relationship between two or more features appearing below is interpreted in the same way.

[0072] On the other hand, referring to Figures 1 - 4, the battery module 10 further includes two steel belts 109. Each steel belt 109 surrounds the battery cell group, and when the steel belt 109 surrounds the battery cell group 101, the first battery cell end plate 1081, and the second battery cell end plate 1082, the extending direction of the steel belt 109 on the first side S1 is parallel to the first direction X. The steel belt 109 is used to bundle the battery cell group 101, making the connection between the battery cells in the battery cell group 101 more firm, and further improving the reliability of the battery module 10. Preferably, in this embodiment, the insulating sheet 105 is also located between the first side S1 of the battery cell group 101 and each steel belt 109. The steel belt 109 is a metal structure, and the width W1 of the insulating sheet 105 along the second direction Y perpendicular to the first direction X is greater than the width W2 of the steel belt 109 along the second direction Y (as Figure 3 shown), and the insulating sheet 105 can insulate the steel belt 109 and the battery cell group 101, preventing the steel belt 109 from directly contacting the battery cells in the battery cell group 101 to react, thereby effectively preventing the steel belt 109 from affecting the working efficiency of the battery module 10.

[0073] Return to reference Figure 1 , the battery module 10 further includes a covering sheet 113. The covering sheet 113 is located on the first side S1 of the battery cell group 101 and covers at least the exposed area of the first side S1. In the embodiment as Figure 1 shown, the exposed area refers to all areas on the first side S1 except the steel belt 109, the fixing strip 104, and the insulating sheet 105. In other embodiments of the present application that do not include the steel belt 109, if the structure of the steel belt 109 is not provided, the exposed area refers to all areas on the first side S1 except the fixing strip 104 and the insulating sheet 105.

[0074] Preferably, the covering sheet 113 includes a polymer phase change material. The polymer phase change material includes solid-solid phase change materials and / or solid-liquid phase change materials. Among them, the solid-solid phase change materials include alkane materials, inorganic salts, polyol materials, and / or cross-linked high-density polyethylene materials, and the solid-liquid phase change materials include sodium sulfate, sodium acetate, calcium chloride, disodium hydrogen phosphate, carbonates, nitrates, sodium chloride, lithium fluoride, paraffin, and / or fatty acid materials. Depending on the selected material, the covering sheet 113 can be transformed from a solid state to a liquid state when the temperature exceeds a certain threshold. When the battery module 10 undergoes a thermal runaway situation, the temperature of the battery module 10 rises, and the covering sheet 113 is transformed into a liquid state to cool down or extinguish the fire of the battery module 10, improving the high-temperature resistance and heat insulation and fire prevention capabilities of the battery module 10.

[0075] As Figure 1 and Figure 2As shown, the battery module 10 further includes a fuse 116 and a copper busbar 117 located on the first end plate 102 and a positive and negative electrode base 118 located on the second end plate 103. The fuse 116 can be blown when an abnormal situation occurs in the battery module 10, for example, the circuit is blown when the current of the battery module 10 is too large, so as to ensure the safety and reliability of the battery module 10. The copper busbar 117 is used to construct a circuit between different battery modules 10 and has a conductive function.

[0076] Reference Figure 5 and Figure 6 , Figure 5 and Figure 6 Shown as Figure 1 The structure diagram of the CCS (Cell Cooling System) component 110 in the battery module 10 shown in FIG. 1 is a schematic diagram of the structure of the CCS component 110. In this embodiment, the CCS component 110 includes a first CCS component 1101 and a second CCS component 1102 (in Figure 1 and Figure 2 In the CCS component, the "A" and "B" are marked respectively as prompts), return to the reference Figure 1 and Figure 2 , the first CCS component 1101 is Figure 1 The CCS assembly 110 on the battery module 10 shown from the front view, the second CCS assembly 1102 is Figure 2 The CCS assembly 110 on the battery module 10 is shown from the back. Figure 1 and Figure 2 After the battery module 10 is assembled, the “-” pole of the first CCS assembly 1101 and the “-” pole of the second CCS assembly 1102 are opposite in space along the second direction Y, and the “+” pole of the first CCS assembly 1101 and the “+” pole of the second CCS assembly 1102 are also opposite in space along the second direction Y. Further, the battery module 10 has two opposite module sides S3, and the first CCS assembly 110 is fixedly connected to the module side S3 of each battery module 10. Exemplarily, the CCS assembly 110 can be welded to the battery module 10.

[0077] In this embodiment, the battery module 10 further includes: Figure 8The bottom bracket 114 shown is used to support the battery module 10 and is close to the first end plate 102 and the second end plate 103. When the steel strip 109 surrounds the battery cell group 101, the first battery cell end plate 1081, and the second battery cell end plate 1082, it also surrounds the bottom bracket 114 at the same time. Therefore, an insulating sheet 105 is also provided on the bottom bracket 114 and placed in a parallel position along the first direction X to prevent the steel strip 109 from reacting with the battery cells inside the bottom bracket 114, thereby effectively preventing the steel strip 109 from affecting the working efficiency of the battery module 10. Exemplarily, the battery module 10 is connected to the bottom bracket 114, and the connection methods include adhesive connection and fixed connection. Specifically, structural adhesive or thermally conductive structural adhesive can be used to adhesively connect the limit insulating sheet 115 and the battery cell group 101 near the bottom bracket 114 to the bottom bracket 114; the bottom bracket 114 also includes bolts and screw holes, and the bottom bracket 114 can be fixedly connected to the battery module 10 through bolts.

[0078] Preferably in this embodiment, there is also a limit insulating sheet 115. The limit insulating sheet 115 is located between the first battery cell end plate 1081 and the second battery cell end plate 1802 and the bottom bracket 114 and is placed along the second direction Y. The first battery cell end plate 1081 and the second battery cell end plate 1802 are adhesively connected to the bottom bracket 114 through the limit insulating sheet 115, and can limit the connection between the battery module 10 and the bottom bracket 114. The bottom bracket 114 is made of metal material. Through the setting of the limit insulating sheet 115, it can be avoided that the bottom bracket 114 reacts with the battery cell group 101, thereby effectively preventing the bottom bracket 114 from affecting the working efficiency of the battery module 10.

[0079] On the other hand, during the assembly process of the battery module 10, first, the first battery cell end plate 1081 is adhesively connected to one side of the first battery cell of the battery cell group, then other battery cells are adhesively connected to the other side of the first battery cell in turn. One side of the last battery cell is connected to the previous battery cell, and the other side is adhesively connected to the second battery cell end plate 1082. Then, different battery cell groups 101 are adhesively connected along the second direction Y through a fireproof and heat-insulating cloth, and then the steel strip 109, the CCS component 110, the bottom bracket 114, the fixing strip 104, the first end plate 102 and the second end plate 103, the positive and negative electrode bases 118, the fuse 116, and the copper busbar 117 are assembled in sequence. When it is necessary to connect multiple battery cell groups 101, the positive and negative electrode positions of two adjacent battery cell groups 101 need to be swapped, and a fireproof and heat-insulating cloth is bonded between the two battery cell groups 101 to improve the fireproof ability of the battery module 10.

[0080] This application also proposes an energy storage system, including multiple battery modules proposed in any embodiment of this application, such as the battery module 10 described above.

[0081] In this application, first, the structure of the upper cover plate is reduced on the battery module, and instead, a fixing strip is used to fix the battery cell group. Second, the structure of the liquid cooling plate and the liquid cooling unit is not provided on the battery module. Instead, fireproof and flame-retardant materials such as aerogel are used to realize the connection of each battery cell in the battery module, saving the occupied space of the battery module and increasing the volume energy density of the battery module, thereby further reducing the manufacturing cost of the energy storage system composed of the battery module. This application also insulates the battery module from other components through the setting of insulating sheets, further improving the performance reliability of the battery module.

[0082] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are proposed in this application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.

[0083] At the same time, specific terms are used in this application to describe the embodiments of this application. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0084] Similarly, it should be noted that, in order to simplify the expression of the disclosure of this application and thus help the understanding of one or more application embodiments, in the previous description of the embodiments of this application, sometimes multiple features are merged into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than those mentioned in the claims. In fact, the features of the embodiment are less than all the features of the single embodiment disclosed above.

[0085] In some embodiments, numbers are used to describe components and the quantity of attributes. It should be understood that such numbers used in the description of embodiments are, in some examples, modified by the modifiers "about", "approximately" or "substantially". Unless otherwise stated, "about", "approximately" or "substantially" indicate that the stated number allows a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and such approximate values may vary according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining the general number of digits. Although the numerical ranges and parameters used in some embodiments of the present application to confirm the breadth of their scope are approximate values, in specific embodiments, such numerical settings are as precise as possible within the feasible range.

[0086] Although the present application has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions can be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A battery module, characterized in that: include: One or more battery cell groups, each of the battery cell groups comprising a plurality of battery cells cascaded along a first direction; A first end plate and a second end plate are located at a first end and a second end of the battery module that are opposite to each other along the first direction, the one or more battery cell groups are located between the first end plate and the second end plate, the first end plate and the second end plate both have an end plate upper surface, and the end plate upper surface includes one or more end plate fixing portions; One or more fixing bars, located on the first side surface of the battery cell group, each of the fixing bars having an extension portion extending along the first direction and connecting portions located at both ends of the extension portion, the connecting portions at both ends of each extension portion being suitable for being fixedly connected to the end plate fixing portions on the upper surfaces of the end plates of the first end plate and the second end plate, respectively; as well as One or more insulating sheets, the insulating sheets are located between the first side surface of the battery cell group and each of the fixing bars, and the width of the insulating sheets along a second direction perpendicular to the first direction is greater than or equal to the width of the fixing bar along the second direction.

2. The battery module according to claim 1, characterized in that: It also includes one or more groups of battery cell end plates, each group of battery cell end plates includes a first battery cell end plate and a second battery cell end plate opposite to each other along the first direction, and each of the first battery cell end plate and the second battery cell end plate is respectively fixedly connected to the second side of each battery cell group close to the first end plate and the second end plate.

3. The battery module according to claim 2, characterized in that: The plurality of battery cells and / or the battery cell group and the first battery cell end plate and the second battery cell end plate are connected by gluing with aerogel and / or foam tape.

4. The battery module according to claim 2, characterized in that: It also includes one or more steel strips, each of which surrounds the battery cell group, and the extension direction of the steel strip on the first side surface when surrounding the battery cell group is parallel to the first direction.

5. The battery module according to claim 4, characterized in that: The insulating sheet is also located between the first side surface of the battery cell group and each of the steel strips.

6. The battery module according to claim 1, characterized in that: It also includes a CCS component, the battery module has two opposite module sides along the second direction, and the CCS component is fixedly connected to each of the module sides.

7. The battery module according to claim 1, characterized in that: It also includes one or more fasteners, and each of the end plate fixing parts is provided with a fixing part through hole suitable for the fastener to pass through, and the fixing strip is suitable for being fixedly connected to the end plate fixing part through the fastener.

8. The battery module according to any one of claims 1 to 7, characterized in that: A covering sheet is also included, and the covering sheet is located on the first side surface of the battery cell group and covers at least an exposed area of ​​the first side surface.

9. The battery module according to claim 8, characterized in that: The cover sheet includes a polymer phase change material, and the polymer phase change material is a solid-solid phase change material or a solid-liquid phase change material.

10. The battery module according to claim 9, characterized in that: The solid-solid phase change material is an alkane material, an inorganic salt, a polyol material or a cross-linked high-density polyethylene material, and the solid-liquid phase change material is sodium sulfate, sodium acetate, calcium chloride, disodium hydrogen phosphate, carbonate, nitrate, sodium chloride, lithium fluoride, paraffin or fatty acid material.

11. An energy storage system, characterized in that: The invention comprises a plurality of battery modules according to any one of claims 1 to 10.

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