Battery shell and battery module

Abstract

The utility model provides a battery case and a battery module, and belongs to the technical field of energy storage equipment, the battery case comprises a shell, the shell comprises an outer shell, an inner shell is arranged in the outer shell, a cooling cavity with at least one end provided with an opening is formed between the outer shell and the inner shell, the cooling cavity is filled with cooling materials, and a containing cavity is arranged in the inner shell and used for containing a battery; the number of the sealing parts is equal to that of the openings of the cooling cavity, the sealing parts are connected with the shell and used for sealing the openings of the cooling cavity, disassembly and assembly through holes are formed in the sealing parts, and when the sealing parts are connected with the shell, the disassembly and assembly through holes in the sealing parts communicate with the containing cavity; the cooling device has the advantages that the cooling cavity and the accommodating cavity for accommodating the battery share the wall, so that heat generated by the battery can be quickly transferred into the cooling cavity, is quickly absorbed by the cooling material in the cooling cavity and is guided out to the shell to be dissipated, the heat transfer path is reduced, and the heat dissipation efficiency is improved; the sealing part is provided with the dismounting through hole, so that the sealing part just seals the cooling cavity without influencing the accommodating cavity, and the dismounting through hole is communicated with the accommodating cavity, so that the accommodating cavity can be communicated with the external space, the subsequent assembly of the battery cell is facilitated, and the sealing part is prevented from being damaged in the assembly process of the battery cell. The shell with the cooling cavity can be used as an independent part, and when the battery cell of the battery is overhauled or maintained, the sealing of the cooling cavity cannot be damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage equipment technical field especially relates to a battery case and battery module. BACKGROUND

[0002] In recent years, lithium ion batteries are widely used in two-wheeled vehicle battery field due to high energy and long service life. Due to the characteristics of lithium ion batteries, a large amount of heat is generated during the working discharge process, and the heat will affect the working performance and service life of the lithium ion battery. When the battery temperature is too high, the capacity of the battery will decrease rapidly, and heat runaway may occur, causing the battery to burn or explode, which greatly threatens the personal safety of the driver. It is very important for lithium ion batteries to maintain within a suitable temperature range.

[0003] At present, the common heat dissipation mode of two-wheeled vehicle battery system is mainly natural heat dissipation. Heat-conducting medium such as silica gel sheet or foam is used to adhere between the battery cells and the battery module and the shell, which is simple and convenient to assemble, can play the role of heat conduction, insulation and shock absorption, effectively conducts heat, and is the mainstream way of two-wheeled vehicle power battery heat dissipation. However, the above heat dissipation methods need to use other heat-conducting and heat-dissipating materials or devices outside the battery to achieve heat dissipation, the heat dissipation path is long, and the heat dissipation efficiency is low. Some existing batteries also add a cooling shell in the battery shell to form a cooling cavity, and fill the cooling material between the battery shell and the cooling shell to achieve cooling. However, the above structure has a disadvantage that when the battery cells in the battery shell need to be maintained or repaired, the cooling cavity will also be opened when the battery shell is opened, which will expose the material in the cooling cavity to the air, and there is a risk of spilling. In order to ensure that the material in the cooling cavity does not spill out, the battery shell must be in a vertical state during disassembly and assembly of the battery cells, which is very inconvenient. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above problems existing in the prior art, and provides a battery shell with good cooling effect and without damaging the cooling cavity structure during disassembly and assembly of the battery cells.

[0005] The utility model can be realized by the following technical scheme: a battery shell, comprising:

[0006] The shell comprises an outer shell, an inner shell is arranged in the outer shell, a cooling cavity with an opening at least at one end is formed between the outer shell and the inner shell, cooling material is filled in the cooling cavity, and a containing cavity for placing a battery is arranged in the inner shell.

[0007] A sealing part, which is equal in number to the openings of the cooling cavity, is connected to the shell to close the openings of the cooling cavity, and a dismounting through hole is arranged on the sealing part, which is communicated with the accommodating cavity when the sealing part is connected to the shell.

[0008] In the battery shell, when the sealing part is fixed to the shell, the inner hole wall of the dismounting through hole does not exceed the inner shell wall of the inner shell.

[0009] In the battery shell, a plurality of barriers are arranged in the cooling cavity to divide the cooling cavity into a plurality of cooling accommodating spaces.

[0010] In the battery shell, the cooling material is in a liquid state, and a communication gap is arranged on each of the barriers to realize the communication between two adjacent cooling accommodating spaces.

[0011] In the battery shell, a pressure relief port is arranged on the inner shell and communicated with the accommodating cavity, and an overpressure release part is arranged on the pressure relief port.

[0012] In the battery shell, the pressure relief port and the communication gap are located at the same end of the shell.

[0013] In the battery shell, the length of the cooling cavity is equal to the length of the inner shell.

[0014] In the battery shell, a reinforcing part is further arranged in the cooling cavity, two ends of the reinforcing part are respectively fixed to the inner wall of the outer shell and the outer wall of the inner shell, and a communication cavity is arranged in the reinforcing part and communicated with the cooling cavity.

[0015] In the battery shell, a cover plate is further arranged, the outer shell and the inner shell form a cooling cavity with an opening at one end, the cover plate is fixed to the shell to close the accommodating cavity.

[0016] A battery module comprising the battery shell.

[0017] Compared with the prior art, the battery shell has the beneficial effects that: the cooling cavity and the accommodating cavity for placing the battery share a wall, so that the heat generated by the battery can be quickly transferred into the cooling cavity, the heat is quickly absorbed by the cooling material in the cooling cavity and is discharged to the shell for dissipation, the heat transfer path is reduced, and the heat dissipation efficiency is improved; the sealing part is provided with a dismounting through hole, so that the sealing part just closes the cooling cavity and does not affect the accommodating cavity, the dismounting through hole is communicated with the accommodating cavity, so that the accommodating cavity is communicated with the external space, the assembly of the battery cell is facilitated, and the shell with the cooling cavity can be used as an independent part in the assembly process of the battery cell, and the closure of the cooling cavity is not damaged when the battery cell is overhauled or maintained. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic view of a three-dimensional structure of a battery shell;

[0019] Figure 2 is an exploded structure schematic view of Figure 1 ;

[0020] Figure 3 is a schematic view of a three-dimensional structure of a battery shell;

[0021] Figure 4 is an exploded structure schematic view of Figure 3 ;

[0022] Figure 5 is a sectional structure schematic view of a battery shell.

[0023] In the figure, the shell 100; the outer shell 101; the inner shell 102; the cooling cavity 103; the accommodating cavity 104; the sealing part 105; the barrier 106; the communication gap 107; the pressure relief port 108; the reinforcing part 109; the bottom plate 110; the dismounting through hole 111. DETAILED DESCRIPTION

[0024] The following is a specific embodiment of the utility model and further describes the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0026] As shown in Figures 1-5 , a battery shell comprises:

[0027] The shell 100 comprises an outer shell 101, an inner shell 102 is arranged in the outer shell 101, a cooling cavity 103 with an opening at least at one end is formed between the outer shell 101 and the inner shell 102, the cooling cavity 103 is filled with a cooling material, and a containing cavity 104 is arranged in the inner shell 102 for placing a battery;

[0028] The sealing part 105 is equal in number to the openings of the cooling cavity 103, and the sealing part 105 is connected with the shell 100 to close the openings of the cooling cavity 103, and a dismounting through hole 111 is arranged on the sealing part 105, and when the sealing part 105 is connected with the shell 100, the dismounting through hole 111 on the sealing part 105 is communicated with the containing cavity 104.

[0029] In the embodiment, the cooling cavity 103 shares a wall with the containing cavity 104 for placing the battery, so that the heat generated by the battery can be quickly transferred to the cooling cavity 103, the heat is quickly absorbed by the cooling material in the cooling cavity 103 and is dissipated to the shell 100, the heat transfer path is reduced, and the heat dissipation efficiency is improved; and the dismounting through hole 111 is arranged on the sealing part 105, so that the sealing part 105 just closes the cooling cavity 103 and does not affect the containing cavity 104, the dismounting through hole 111 is communicated with the containing cavity 104, so that the containing cavity 104 can be communicated with the external space, facilitating the subsequent assembly of the battery cell, so that the shell 100 with the cooling cavity 103 can be used as an independent part during the assembly of the battery cell, and the closure of the cooling cavity 103 will not be damaged when the battery cell is repaired or maintained.

[0030] Preferably, when the sealing part 105 is fixed with the shell 100, the inner hole wall of the dismounting through hole 111 does not exceed the inner shell wall of the inner shell 102.

[0031] In the embodiment, the dismounting through hole 111 on the sealing part 105 serves as an opening for communication between the containing cavity 104 and the external space, and the battery cell passes through the dismounting through hole 111 to extend into the containing cavity 104, and preferably, the inner ring wall of the sealing part 105 does not exceed the shell wall of the inner shell 102, that is, the inner hole wall does not block the installation of the battery cell during the assembly of the battery cell.

[0032] Further preferably, a plurality of barriers 106 are arranged in the cooling cavity 103 to divide the cooling cavity 103 into a plurality of cooling containing spaces, and the barriers 106 can also realize mutual support between the outer shell 101 and the inner shell 102 and have a buffering function.

[0033] Further preferably, the cooling material is in a liquid state, and a communication gap 107 is arranged on each barrier 106 to realize communication between adjacent two cooling containing spaces.

[0034] In the embodiment, the cooling material is in liquid state, and the heat dissipation liquid such as heat dissipation silicon oil can be selected. The communication gap 107 on the barrier 106 is arranged so that the cooling material in each cooling containing space can flow and distribute the heat from the hot spot to the whole cooling liquid uniformly, thereby avoiding the problem of local overheating.

[0035] It is worth mentioning that the barrier 106 is made of material with good heat resistance, strong corrosion resistance and high mechanical strength, such as stainless steel, aluminum alloy, copper nylon or polyether ether ketone.

[0036] Further preferably, the inner shell 102 is provided with a pressure relief port 108 communicating with the containing cavity 104, and the pressure relief port 108 is provided with an overpressure release part.

[0037] In the embodiment, as an optional solution, the overpressure release part can be an explosion-proof film. When the battery is working normally, the heat dissipation material filled in the cooling cavity 103 can absorb and radiate the heat generated by the battery to the outside. When the battery is in thermal runaway, the cooling cavity 103 reaches a certain pressure, the explosion-proof film breaks, and the heat dissipation material flows into the inner shell 102 through the pressure relief port 108 to soak the battery cell module, achieving the purpose of rapid heat absorption and cooling, and preventing the spread of thermal runaway.

[0038] Further preferably, the pressure relief port 108 and the communication gap 107 are located at the same end of the shell 100.

[0039] In the embodiment, in order to make the cooling material flowing in the cooling cavity 103 flow into the inner shell 102 through the pressure relief port 108 as much as possible and as quickly as possible, the pressure relief port 108 and the communication gap 107 are located at the same end of the shell 100. As a preferred solution, the pressure relief port 108 and the communication gap 107 are arranged at the lower end of the battery during use of the battery. When the pressure relief port 108 is opened, the heat dissipation material flows out of the pressure relief port 108 rapidly under the action of gravity.

[0040] Further preferably, the length of the cooling cavity 103 is equal to the length of the inner shell 102, so that the cooling cavity 103 can fully wrap the battery cell and ensure that the heat generated by the battery cell can be absorbed by the cooling cavity 103 in time.

[0041] Further preferably, the cooling cavity 103 is further provided with a reinforcing part 109, both ends of the reinforcing part 109 are fixed to the inner wall of the outer shell 101 and the outer wall of the inner shell 102, and the reinforcing part 109 is provided with a communication cavity communicating with the cooling cavity 103.

[0042] In the embodiment, the partition 106 in the cooling cavity 103 supports the connection between the inner shell 102 and the outer shell 101, and in order to ensure the stability of the shell 100, a reinforcing part 109 is additionally arranged in the cooling cavity 103. The reinforcing part 109 is a reinforcing strip, which is preferably arranged at the corner of the inner shell 102 and the outer shell 101, so as to improve the overall rigidity and impact resistance.

[0043] Further preferably, the shell 100 further comprises a cover plate, and the outer shell 101 and the inner shell 102 form a cooling cavity 103 with an opening at one end, and the cover plate is fixed to the shell 100, so as to close the containing cavity 104.

[0044] It is worth mentioning that the containing cavity 104 is communicated with the external space through the sealing part 105, so the number of the sealing part 105 is equal to the number of the openings of the containing cavity 104.

[0045] In the embodiment, the dismounting through hole 111 on the sealing part 105 is communicated with the containing cavity 104, so as to realize the dismounting of the battery cell. As an optional solution, the outer shell 101 and the inner shell 102 form a cooling cavity 103 with an opening at one end, and the sealing part 105 is used to close the opening of the cooling cavity 103, and the dismounting through hole 111 on the sealing part 105 is used to communicate the containing cavity 104 with the external space, so as to realize the dismounting of the battery cell.

[0046] Specifically, as shown in Figure 2 one end of the shell 100 is fixedly provided with a bottom plate 110, so as to simultaneously close the end of the cooling cavity 103 and the end of the containing cavity 104. The shell 100 and the bottom plate 110 cooperatively form a cooling cavity 103 with an opening at one end, and the other end of the shell 100 is provided with a sealing part 105 to close the opening of the cooling cavity 103. The cover plate is connected to the shell 100 to close the containing cavity 104, and when the battery cell is dismounted, the cover plate is opened. As another optional solution, the shell 100 is provided with a cooling cavity 103 with openings at both ends, and the openings at both ends of the cooling cavity 103 are connected through the sealing part 105.

[0047] A battery comprises the battery shell as described above.

[0048] It should be noted that in the present application, the description of "first", "second", "one" and the like are only used for the purpose of description and can not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited. The terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0050] The specific embodiments described herein are merely illustrative of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A battery case characterized by comprising: The application relates to a battery shell. The battery shell comprises a shell, an inner shell arranged in the shell, a cooling cavity with an opening at one end formed between the shell and the inner shell, and cooling material filled in the cooling cavity; a sealing part equal in number to the openings of the cooling cavity, the sealing part being connected with the shell to seal the openings of the cooling cavity, and a dismounting through hole arranged on the sealing part and communicated with the accommodating cavity when the sealing part is connected with the shell. When the sealing part is fixed with the shell, the inner hole wall of the dismounting through hole does not exceed the inner shell wall of the inner shell.

2. A battery case according to claim 1, wherein The cooling cavity is provided with a plurality of barriers to divide the cooling cavity into a plurality of cooling accommodating spaces.

3. The battery case of claim 1, wherein The cooling material is in a liquid state, and each of the barriers is provided with a communication gap to realize the communication between two adjacent cooling accommodating spaces.

4. A battery case according to claim 3, wherein The inner shell is provided with a pressure relief port communicated with the accommodating cavity, and the pressure relief port is provided with an overpressure release part.

5. A battery case as defined in claim 4, wherein The pressure relief port and the communication gap are located at the same end of the shell.

6. A battery case as defined in claim 5, wherein The length of the cooling cavity is equal to the length of the inner shell.

7. The battery case of claim 1, wherein The cooling cavity is further provided with a reinforcing part, two ends of the reinforcing part being fixed with the inner wall of the shell and the outer wall of the inner shell respectively, and the reinforcing part being provided with a communication cavity communicated with the cooling cavity.

8. The battery case of claim 1, wherein The application further relates to a cover plate, the shell and the inner shell forming a cooling cavity with an opening at one end, and the cover plate being fixed with the shell to seal the accommodating cavity.

9. The battery case of claim 1, wherein The application further relates to a battery comprising the battery shell as claimed in any one of claims 1-9.

10. A battery module, characterized by ​

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