Battery and energy storage system

Abstract

The utility model discloses a battery and an energy storage system. The battery comprises a shell and a battery cell module, wherein the shell comprises a shell with an accommodating cavity and a top cover for sealing the shell; the shell is provided with a liquid inlet and a liquid outlet; the battery cell module is arranged in the accommodating cavity and is connected with the top cover; the battery cell module is provided with a top surface facing the top cover, and the surface where the output electrode of the battery cell module and the anti-explosion valve are located avoids the top surface of the battery cell module; cooling liquid is injected into the shell, and the pole of the battery cell module and the anti-explosion valve are located in the cooling liquid. According to the utility model, the pole and the explosion-proof valve of the battery cell module are not arranged on the top surface, so that the cooling liquid in the shell does not need to be filled to submerge the top surface of the battery cell module, and now, the cooling liquid only needs to submerge the explosion-proof valve, so that the cooling liquid is reduced, the overall structure is simple, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage batteries, and in particular to a battery and an energy storage system. Background Art

[0002] Energy storage batteries generate a large amount of heat during the charging and discharging process, posing the risk of battery combustion or explosion. Currently, battery temperature management is mainly carried out by air cooling and liquid cooling.

[0003] Among them, air cooling uses air as the cooling medium and utilizes natural convection or forced convection heat exchange to dissipate heat from the battery. Due to the low specific heat capacity and convection heat transfer coefficient of air, the heat exchange efficiency of air cooling is low. For batteries with high charge and discharge power, the heat generated by the battery will increase sharply during charge and discharge, and the air cooling system cannot dissipate heat from the battery in time, resulting in excessively high battery temperature, which in turn affects the battery's service life and the risk of thermal runaway.

[0004] Liquid cooling uses liquid as the cooling medium. By arranging cooling plates on both sides and the bottom of the battery, the heat generated by the battery is taken away by the cooling water circulating in the cooling plates, and the temperature of the cooling water is reduced by an external heat exchange module.

[0005] Currently, batteries mainly use indirect liquid cooling, which has a complex and heavy system, relatively high cost and limited heat dissipation effect. Utility Model Content

[0006] The purpose of the utility model is to provide a battery and an energy storage system with lower cost and better cooling effect.

[0007] In order to solve the above technical problems, the embodiments of the present invention provide a battery, comprising:

[0008] The housing comprises: a shell having a receiving cavity and a top cover covering the shell; the shell has a liquid inlet and a liquid outlet;

[0009] A battery cell module, the battery cell module is arranged in the accommodating cavity and connected to the top cover; the battery cell module has a top surface facing the top cover, and the poles and explosion-proof valve of the battery cell module are located away from the top surface of the battery cell module;

[0010] Wherein, coolant is injected into the shell, and the poles and explosion-proof valve of the battery module are located in the coolant.

[0011] Compared to the prior art, the present invention places the cell module within the housing, with the cell module's poles and explosion-proof valve located within the coolant, allowing the coolant to dissipate heat directly from the cell module. Furthermore, the cell module's poles and explosion-proof valve are not located on the top surface, eliminating the need for the coolant within the housing to completely submerge the cell module. Instead, the coolant only needs to submerge the explosion-proof valve, reducing the amount of coolant required, simplifying the overall structure, and lowering costs. Furthermore, compared to designs where the poles and explosion-proof valve are located on the top surface, facing the top cover, the explosion-proof valve provides a longer cooling path when cooling, eliminating the need for the coolant to spray directly from the top onto the top cover. Furthermore, the coolant is located within the housing's accommodating cavity, eliminating the need to completely fill the housing. The coolant does not come into contact with the top cover or the joint between the two. This arrangement reduces corrosion of the coolant at the joint between the housing and the top cover, as well as the risk of coolant leakage, resulting in a more effective and stable battery.

[0012] In one embodiment, a first gap is provided between the battery cell module and the bottom surface of the housing;

[0013] The pole and the explosion-proof valve of the battery cell module are located on the side of the battery cell module facing the bottom surface of the shell.

[0014] In one embodiment, a distance between a side of the battery cell module facing the bottom surface of the shell and the bottom surface of the shell is greater than or equal to 2 mm.

[0015] In one embodiment, the liquid level of the coolant is higher than the explosion-proof valve and the pole.

[0016] In one embodiment, the coolant includes at least one of a fluorine-based coolant, a hydrocarbon-based coolant, a silicone oil-based coolant, an ester-based coolant, and a water-based coolant.

[0017] In one embodiment, the battery cell module is electrically connected to the external output electrode on the housing via the output electrode;

[0018] The bottom surface of the shell has an opening area, and the opening area covers the area where the output pole of the battery module is located;

[0019] The housing further comprises: a cover plate for covering the opening area and a first sealing gasket, wherein the first sealing gasket is clamped between the cover plate and the bottom surface of the shell.

[0020] In one embodiment, the side wall of the housing has an external output electrode electrically connected to the output electrode of the battery module; the opening area is close to the side of the side wall of the housing having the external output electrode;

[0021] The liquid inlet and the liquid outlet are both arranged on the side wall of the shell; and a second gap is arranged between the battery core module and the side wall of the shell.

[0022] In one embodiment, a second sealing gasket is clamped between the top cover and the shell; the battery cell module is fixedly connected to the top cover, and a support member for supporting the battery cell module is further provided on the top cover.

[0023] In one embodiment, the battery cell module includes: multiple rows of battery cell groups, and busbars arranged on each of the battery cell groups; the battery cell group has multiple battery cells arranged in sequence, and two adjacent battery cells are electrically connected via a connector.

[0024] In one embodiment, the support member comprises:

[0025] End support plates, provided at both ends of the battery cell group;

[0026] Strapping tape, used to strap and fix the end support plate and the battery cell group;

[0027] The support member body has one side fixedly connected to the end of the end support plate and the other side fixedly connected to the top cover. The support member stably fixes the battery module to the top cover and increases the strength of the top cover.

[0028] In one embodiment, the surface of the component in contact with the coolant is provided with an anti-organic corrosion layer; the anti-organic corrosion layer is prepared from at least one of flame-retardant polyethylene, flame-retardant polypropylene, flame-retardant natural rubber, flame-retardant EPDM rubber or flame-retardant polytetrafluoroethylene.

[0029] The embodiment of the present utility model further provides an energy storage system, comprising:

[0030] Cabinet;

[0031] At least one battery as described in any one of the above items, wherein the battery is arranged in the cabinet; and

[0032] A refrigeration unit is provided in the cabinet and is connected to the accommodating chambers of the batteries through pipes.

[0033] In one embodiment, the energy storage system further includes a controller and a high-voltage box.

[0034] The embodiments of the present invention further provide a battery installation method for the battery as described in any one of the above, comprising the following steps:

[0035] Install the battery module onto the top cover;

[0036] Putting the top cover with the battery cell module installed on the shell, and placing the battery cell module into the accommodating cavity of the shell;

[0037] Connect the output electrode of the battery cell module to the external output electrode of the housing through the opening on the bottom surface of the battery housing;

[0038] Covering the opening on the bottom surface of the housing;

[0039] Cooling liquid is injected into the shell through the liquid inlet, and the cooling liquid covers the poles and explosion-proof valve of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0041] Figure 1 This is a schematic structural diagram of a battery according to the first embodiment of the present utility model;

[0042] Figure 2 is a cross-sectional view of a battery according to a first embodiment of the present utility model;

[0043] Figure 3 is an exploded view of a battery according to the first embodiment of the present utility model;

[0044] Figure 4 1 is a schematic diagram of the structure of the battery support member according to the first embodiment of the present utility model;

[0045] Figure 5 This is a partial exploded view of the battery after being inverted according to the first embodiment of the present utility model;

[0046] Figure 6 1 is a schematic structural diagram of a battery energy storage system according to the second embodiment of the present utility model;

[0047] Among them, 100, battery; 1, outer shell; 11, shell; 111, opening area; 12, top cover; 13, liquid inlet; 14, liquid outlet; 15, external output pole; 2, battery cell module; 21, battery cell; 22, busbar; 23, connector; 24, output pole; 25, explosion-proof valve; 26, pole; 3, cover plate; 4, first sealing gasket; 5, second sealing gasket; 6, support member; 61, support member body; 62, end support plate; 63, strapping belt; 7, coolant; 200, energy storage system; 201, cabinet; 202, controller; 203, high-voltage box; 204, pipeline; 205, refrigeration unit; 206, inlet; 207, outlet. DETAILED DESCRIPTION

[0048] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, each embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that many technical details are provided in each embodiment of the present invention to help readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented.

[0049] In the following description, for the purpose of illustrating the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0050] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, that is, should be interpreted to mean "including, but not limited to."

[0051] The following will be combined with the accompanying drawings to describe in detail the various embodiments of the present invention so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0052] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0053] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0054] In the following description, in order to clearly demonstrate the structure and working mode of the present invention, many directional words will be used for description, but words such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and should not be understood as restrictive terms.

[0055] The following describes embodiments of the present invention with reference to the accompanying drawings.

[0056] One embodiment of the present invention relates to a battery 100. Figure 1 、 Figure 2 and Figure 3 As shown, the battery 100 includes: a shell 1 and a battery module 2. The shell 1 includes: a shell 11 having a accommodating cavity, and a top cover 12 covering the shell 11. The shell 11 has a liquid inlet 13 and a liquid outlet 14. The battery module 2 is arranged in the accommodating cavity and is connected to the top cover 12. The battery module 2 has a top surface facing the top cover 12, and the surface where the pole 26 of the battery module 2 and the explosion-proof valve 25 are located avoids the top surface of the battery module 2. Coolant 7 is injected into the shell 1, and the pole 26 and the explosion-proof valve 25 of the battery module 2 are located in the coolant 7.

[0057] In the embodiment of the present invention, the battery module 2 has a top surface facing the top cover 12 , and the surface where the pole 26 and the explosion-proof valve 25 of the battery module 2 are located avoids the top surface of the battery module 2 , so that the battery pack can be inverted or placed sideways.

[0058] By placing the battery cell module 2 in the housing 11, and with the poles 26 and explosion-proof valve 25 of the battery cell module 2 located in the coolant 7, the coolant 7 can directly dissipate heat from the battery cell module 2. In addition, the poles 26 and explosion-proof valve 25 of the battery cell module 2 are not located on the top surface, so that the coolant 7 in the housing 11 does not need to be filled to the point of covering the top surface of the battery cell module 2. Instead, it is sufficient to cover the explosion-proof valve 25 with the coolant 7, thereby reducing the amount of coolant 7 and simplifying the overall structure to reduce costs. At the same time, compared to a case where the poles 26 and explosion-proof valve 25 are located on the top surface facing the top cover 12, the current explosion-proof valve 25 has a longer cooling path when it is sprayed to cool down, and will not spray directly from the top into the coolant 7 directly onto the top cover 12. Furthermore, the coolant 7 is located in the accommodating cavity of the shell 11. The coolant 7 does not need to fill the shell 11. The coolant 7 does not contact the top cover 12, nor does it contact the connection between the shell 11 and the top cover 12. This arrangement reduces the corrosion of the coolant 7 on the liquid at the connection between the shell 11 and the top cover 12, and also reduces the risk of leakage of the coolant, so that the sealing effect of the battery 100 is better and the stability is stronger.

[0059] Furthermore, if Figure 1 、 Figure 2 and Figure 3 As shown, Figure 2Where P is the liquid level of the coolant, and a first gap is provided between the battery cell module 2 and the bottom surface of the shell 11. The pole 26 and the explosion-proof valve 25 of the battery cell module 2 are located on the side of the battery cell module 2 facing the bottom surface of the shell 11. Therefore, less coolant 7 can be placed, and it is not necessary to fill the shell 11 to ensure that the pole 26 and the explosion-proof valve 25 of the battery cell module 2 are fully in the coolant 7. When the explosion-proof valve 25 is sprayed, it is sprayed at the bottom of the coolant 7, and the cooling path is longer, allowing more coolant 7 to cool and achieve a better cooling effect. In other embodiments, the pole 26 and the explosion-proof valve 25 of the battery cell module 2 may be opposite to the side wall of the shell 11, and are not limited to facing the bottom surface of the shell 11.

[0060] In addition, the distance between the side of the battery cell module 2 facing the bottom surface of the housing 11 and the bottom surface of the housing 11 is greater than or equal to 2 mm. Optionally, the distance between the side of the battery cell module 2 facing the bottom surface of the housing 11 and the bottom surface of the housing 11 can be 3 mm-6 mm.

[0061] Furthermore, the liquid level of the coolant 7 is below the explosion-proof valve; preferably, the liquid level of the coolant is below the explosion-proof valve, and the coolant 7 does not contact the top cover 12 , that is, the coolant 7 does not need to fill the shell 11 .

[0062] Furthermore, the coolant level is less than or equal to four-fifths of the height of the battery cell module 2; preferably, less than or equal to one-half of the height of the battery cell module 2. This allows for optimal cooling with minimal coolant usage. When the battery pack is placed on its side, the coolant level is no lower than the topmost electrode, ensuring that all electrodes are completely submerged.

[0063] Furthermore, the coolant 7 includes at least one of a fluorine-based coolant, a hydrocarbon-based coolant, a silicone oil-based coolant, an ester-based coolant, and a water-based coolant.

[0064] Furthermore, the battery cell module 2 is electrically connected to the external output pole 15 on the housing 11 via the output pole 24 .

[0065] Furthermore, if Figure 5As shown, the bottom surface of the housing 11 has an opening area 111, which covers the area where the output pole 24 of the battery module 2 is located. The housing 1 also includes a cover plate 3 that covers the opening area 111 and a first sealing gasket 4. The first sealing gasket 4 is clamped between the cover plate 3 and the bottom surface of the housing 11. When installing the battery 100, the battery module 2 is fixed to the top cover 12. The top cover 12 and the battery module 2 are buckled onto the housing 11. The battery module 2 enters the accommodating cavity. The top cover 12 and the housing 11 are fixed to cover the housing 11. The output pole 24 of the battery module 2 is then electrically connected to the external output pole 15 through the opening area 111 via an electrical connector. After the connection is completed, the first sealing gasket 4 is clamped between the cover plate 3 and the bottom surface of the housing 11. The cover plate 3 seals the bottom surface of the housing 11. Finally, coolant 7 is injected into the housing 11 through the liquid inlet 13.

[0066] In addition, if Figure 1 、 Figure 3 As shown, the side wall of the housing 11 has an external output pole 15 electrically connected to the output pole 24 of the battery module 2. The opening area 111 is close to the side wall of the housing 11 having the external output pole 15, so as to facilitate access to the operating port to operate the battery module 2. The external output pole 15 includes a positive output pole and a negative output pole. The liquid inlet 13 and the liquid outlet 14 are arranged on the side wall of the housing 11, and a second gap is provided between the battery module 2 and the side wall of the housing 11. The external output pole 15, the liquid inlet 13 and the liquid outlet 14 can all be arranged on the same side wall of the housing 11.

[0067] Furthermore, if Figure 3 As shown, a second sealing gasket 5 is clamped between the top cover 12 and the shell 11. The top cover 12 and the shell 11 can be fixedly connected by screws or sealant. The battery module 2 is fixedly connected to the top cover 12, and a support member 6 for supporting the battery module 2 is also provided on the top cover 12. The support member 6 can increase the strength of the top cover 12, and the battery module 2 and the top cover 12 can be fixed more stably. The battery module 2 can be fixed to the top cover 12 by bolts or glue. In this example, the explosion-proof valve 25 is not provided on the top surface of the battery module 2, so that the coolant 7 does not need to cover the top surface of the battery module 2 and will not interfere with the second sealing gasket 5, so that the top surface seal of the shell 11 is more stable.

[0068] In addition, if Figure 3 As shown, the cell module 2 includes multiple rows of cell groups and busbars 22 disposed on each cell group. Each cell group has multiple sequentially arranged cells 21, with adjacent cells 21 electrically connected via connectors 23, which can be copper bars. The cell groups can be arranged perpendicular to the arrangement of the individual cells within the group. During installation, the rows of cell groups can be mounted sequentially on the top cover 12, or they can be assembled into a cell module 2 and then secured to the top cover 12.

[0069] Furthermore, if Figure 4 As shown, the support member 6 includes: an end support plate 62, which is arranged at both ends of the battery cell group; a strapping belt 63, which is used to strap and fix the end support plate 62 to the battery cell group; a support member body 61, one side of the support member body 61 is fixedly connected to the end of the end support plate 62, and the other side of the support member body 61 is fixedly connected to the top cover 12; the support member 6 stably fixes the battery cell module 2 and the top cover 12, and increases the strength of the top cover 12.

[0070] Furthermore, the surface of the components that come into contact with the coolant (including but not limited to battery connectors, signal lines, sensor components, etc.) is preferably provided with an anti-organic corrosion layer, wherein the anti-organic corrosion layer is prepared from at least one of flame-retardant polyethylene, flame-retardant polypropylene, flame-retardant natural rubber, flame-retardant EPDM rubber or flame-retardant polytetrafluoroethylene.

[0071] The second embodiment of the present invention relates to an energy storage system 200. Figure 6 As shown, the energy storage system 200 includes a controller 202, a cabinet 201, at least one battery 100 as described in the above embodiments, and a refrigeration unit 205. The controller 202, battery 100, and refrigeration unit 205 are disposed within the cabinet 201. The refrigeration unit 205 is connected to the housing of each battery 100 via a pipe 204. In the energy storage system 200, multiple batteries 100 are connected in series and electrically connected to the high-voltage box 203 within the cabinet 201. The refrigeration unit 205 has an inlet 206 and an outlet 207. The outlet 207 is connected to the liquid inlet 13 of the battery 100 via a pipe 204. The liquid outlet 14 of the battery 100 is connected to the inlet 206 via a pipe 204, thereby enabling flow cooling of the coolant 7. The housings 11 of the multiple batteries 100 are connected in parallel to the refrigeration unit 205.

[0072] It is not difficult to find that this embodiment is a system embodiment corresponding to the first embodiment, and this embodiment can be implemented in conjunction with the first embodiment. The relevant technical details mentioned in the first embodiment are still valid in this embodiment, and to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the first embodiment.

[0073] The third embodiment of the present invention relates to a method for installing a battery 100. The installation method is used in the battery 100 of the first embodiment, such as Figure 5 The following steps are included:

[0074] Step 100: Install the battery module 2 onto the top cover 12;

[0075] Step 200 , placing the top cover 12 with the battery module 2 mounted thereon onto the housing 11 , and placing the battery module 2 into the accommodating cavity of the housing 11 ;

[0076] Step 300 , connecting the output electrode 24 of the cell module 2 to the external output electrode 15 of the housing 11 through the opening on the bottom surface of the housing 11 of the battery 100 ;

[0077] Step 400, sealing the opening on the bottom surface of the housing 11;

[0078] In step 500 , the coolant 7 is injected into the housing 11 through the liquid inlet 13 , and the coolant 7 covers the pole 26 of the battery module 2 and the explosion-proof valve 25 .

[0079] It is not difficult to find that this embodiment is a system embodiment corresponding to the first embodiment, and this embodiment can be implemented in conjunction with the first embodiment. The relevant technical details mentioned in the first embodiment are still valid in this embodiment, and to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the first embodiment.

[0080] While preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide further embodiments.

[0081] These and other changes can be made to the embodiments in light of the above detailed description.In general, in the claims, the terms used should not be construed as limited to the specific embodiments disclosed in the specification and claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which these claims are entitled.

[0082] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present invention, and that in actual applications, various changes may be made in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A battery, characterized in that: include: The housing comprises: a shell having a receiving cavity and a top cover covering the shell; the shell has a liquid inlet and a liquid outlet; A battery cell module, the battery cell module is arranged in the accommodating cavity and connected to the top cover; the battery cell module has a top surface facing the top cover, and the poles and explosion-proof valve of the battery cell module are located away from the top surface of the battery cell module; Wherein, coolant is injected into the shell, and the poles and explosion-proof valve of the battery module are located in the coolant.

2. The battery according to claim 1, characterized in that A first gap is provided between the battery cell module and the bottom surface of the shell; The pole and the explosion-proof valve of the battery cell module are located on the side of the battery cell module facing the bottom surface of the shell.

3. The battery according to claim 2, characterized in that The distance between the side of the battery cell module facing the bottom surface of the shell and the bottom surface of the shell is greater than or equal to 2 mm.

4. The battery according to claim 1, characterized in that The liquid level of the coolant is higher than the explosion-proof valve and the pole.

5. The battery according to claim 1, characterized in that The bottom surface of the shell has an opening area, and the opening area covers the area where the output pole of the battery module is located; The housing further comprises: a cover plate for covering the opening area and a first sealing gasket, wherein the first sealing gasket is clamped between the cover plate and the bottom surface of the shell.

6. The battery according to claim 5, characterized in that The side wall of the housing is provided with an external output pole electrically connected to the output pole of the battery module; the opening area is close to the side wall of the housing having the external output pole; The liquid inlet and the liquid outlet are both arranged on the side wall of the shell; and a second gap is arranged between the battery core module and the side wall of the shell.

7. The battery according to claim 1, characterized in that A second sealing gasket is clamped between the top cover and the shell; the battery cell module is fixedly connected to the top cover, and a support member for supporting the battery cell module is also provided on the top cover.

8. The battery according to claim 1, characterized in that The battery cell module includes: multiple rows of battery cell groups, and busbars arranged on each of the battery cell groups; each of the battery cell groups has multiple battery cells arranged in sequence, and two adjacent battery cells are electrically connected via a connector.

9. The battery according to claim 1, characterized in that The surface of the component contacting the coolant is provided with an anti-organic corrosion layer.

10. An energy storage system, characterized in that: include: Cabinet; at least one battery according to any one of claims 1 to 9, wherein the battery is disposed in the cabinet; as well as A refrigeration unit is provided in the cabinet and is connected to the accommodating chambers of the batteries through pipes.

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