Square battery shell and long-circulation battery

Abstract

The square battery shell comprises a shell body, electrolyte storage chambers are arranged at the four corners in the shell body, electrolyte injection holes are formed in the upper sides of the electrolyte storage chambers, sealers are arranged in the electrolyte injection holes, liquid supplementing openings are formed in the lower sides of the electrolyte storage chambers, and the electrolyte supplementing openings are communicated with the electrolyte storage chambers. A liquid supplementing opening and closing mechanism used for controlling opening and closing of the liquid supplementing opening is arranged in the liquid supplementing opening, first electrolyte is arranged in the shell, and second electrolyte is arranged in the electrolyte storage chamber. The long-circulation battery adopts the square battery shell; the electrolyte can be supplemented in time, and the service life of the long-circulation battery is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a square battery shell and a long-cycle battery. Background Art

[0002] At present, the technical means to extend the cycle life of batteries are to solve the problem through electrolyte additives, electrode design and material coating.

[0003] The main reason for the reduction in battery life is the consumption of electrolyte during use. Generally, the electrolyte cannot be replenished during the use of the battery cell. This situation results in the battery's long-term service life not being able to be extended for a long time. Summary of the invention

[0004] The utility model aims to provide a square battery shell and a long cycle battery, so as to solve the problem that the electrolyte inside the current battery cannot be supplemented.

[0005] The purpose of the utility model is achieved as follows: a square battery shell, comprising a shell, wherein electrolyte storage chambers are arranged at the four corners of the shell, an injection hole is arranged on the upper side of the electrolyte storage chamber, a sealer is arranged inside the injection hole, a liquid replenishment port is arranged on the lower side of the electrolyte storage chamber, a liquid replenishment switch mechanism for controlling the opening and closing of the liquid replenishment port is arranged inside the liquid replenishment port, a first electrolyte is arranged inside the shell, and a second electrolyte is arranged inside the electrolyte storage chamber.

[0006] The shell is a rectangular structure with one side open.

[0007] The sealer type is a rubber plug.

[0008] The liquid replenishment switch mechanism includes a sealing block and a spring sheet. The sealing block cooperates with the liquid replenishment port, and the sealing block is connected to the electrolyte storage chamber through the spring sheet.

[0009] A long cycle battery adopts the aforementioned square battery casing.

[0010] The beneficial effects of the utility model are as follows: when the device is in use, the square battery shell includes a shell, a first electrolyte is arranged inside the shell, electrolyte storage chambers are arranged at the four corners inside the shell, an injection hole is arranged on the upper side of the electrolyte storage chamber, a second electrolyte can be added to the electrolyte storage chamber through the injection hole, a sealer can seal the injection hole, a refilling port with a refilling switch mechanism is arranged on the lower side of the electrolyte storage chamber, the refilling switch mechanism can be opened by means of pressure difference, and after opening, the second electrolyte flows into the shell through the refilling port. In addition, a long-cycle battery is also provided. The long-cycle battery adopts the above-mentioned square battery shell, and the electrolyte can be replenished in time, thereby extending the service life of the long-cycle battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a square battery shell and a shell structure diagram of a long-cycle battery.

[0012] Figure 2 The utility model is a top view of the interior of a square battery shell and a long-cycle battery shell.

[0013] Figure 3 The utility model is a cross-sectional structural diagram of a square battery housing and an electrolyte storage chamber of a long-cycle battery.

[0014] Figure 4 The utility model is a square battery shell and a long cycle battery Figure 3 Enlarged view of part A in the middle.

[0015] In the figure: 1, housing 2, electrolyte storage chamber 3, injection hole 4, sealer 5, liquid replenishment port 6, liquid replenishment switch mechanism 7, spring piece 8, closing block. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings.

[0017] Example 1

[0018] like Figure 1-4 As shown, a square battery shell includes a shell 1, wherein the shell 1 is provided with electrolyte storage chambers 2 at the four corners thereof, an injection hole 3 is provided on the upper side of the electrolyte storage chamber 2, a sealer 4 is provided inside the injection hole 3, a refilling port 5 is provided on the lower side of the electrolyte storage chamber 2, a refilling switch mechanism 6 for controlling the opening and closing of the refilling port 5 is provided inside the refilling port 5, a first electrolyte is provided inside the shell 1, and a second electrolyte is provided inside the electrolyte storage chamber 2.

[0019] The housing 1 is a rectangular structure with one side open.

[0020] The sealer 4 is a rubber plug.

[0021] The liquid replenishment switch mechanism 6 includes a sealing block 8 and a spring piece 7 . The sealing block 8 cooperates with the liquid replenishment port 5 . The sealing block 8 is connected to the electrolyte storage chamber 2 via the spring piece 7 .

[0022] A long cycle battery adopts the aforementioned square battery casing.

[0023] When the utility model is in use, the square battery shell includes a shell 1, a first electrolyte is arranged inside the shell 1, electrolyte storage chambers 2 are arranged at four corners inside the shell 1, an injection hole 3 is arranged on the upper side of the electrolyte storage chamber 2, a second electrolyte can be added to the electrolyte storage chamber 2 through the injection hole 3, a sealer 4 can seal the injection hole 3, a refilling port 5 with a refilling switch mechanism 6 is arranged on the lower side of the electrolyte storage chamber 2, the refilling switch mechanism 6 can be opened by means of pressure difference, and after opening, the second electrolyte flows into the shell 1 through the refilling port 5. In addition, a long cycle battery is also provided. The long cycle battery adopts the above-mentioned square battery shell, and the electrolyte can be replenished in time, thereby extending the service life of the long cycle battery.

[0024] Example 2

[0025] like Figure 1-4 As shown, a square battery shell includes a shell 1, wherein the shell 1 is provided with electrolyte storage chambers 2 at the four corners thereof, an injection hole 3 is provided on the upper side of the electrolyte storage chamber 2, a sealer 4 is provided inside the injection hole 3, a refilling port 5 is provided on the lower side of the electrolyte storage chamber 2, a refilling switch mechanism 6 for controlling the opening and closing of the refilling port 5 is provided inside the refilling port 5, a first electrolyte is provided inside the shell 1, and a second electrolyte is provided inside the electrolyte storage chamber 2.

[0026] For better effect, the housing 1 is a rectangular structure with one side open.

[0027] For better effect, the sealer 4 is of rubber plug type, and the sealer 4 is used to seal the injection hole 3 to prevent the second electrolyte from leaking from the injection hole 3. The sealer 3 may be of any type as long as it can achieve the above effect.

[0028] For better effect, the refill switch mechanism 6 includes a closing block 8 and a spring 7. The closing block 8 cooperates with the refill port 5. The closing block 8 is connected to the electrolyte storage chamber 2 through the spring 7. The closing block 8 has a sealing effect on the refill port 5.

[0029] A long cycle battery adopts the aforementioned square battery casing.

[0030] When the utility model is in use, the square battery shell includes a shell 1, a first electrolyte is arranged inside the shell 1, electrolyte storage chambers 2 are arranged at four corners inside the shell 1, an injection hole 3 is arranged on the upper side of the electrolyte storage chamber 2, a second electrolyte can be added to the electrolyte storage chamber 2 through the injection hole 3, a sealer 4 can seal the injection hole 3, a refilling port 5 with a refilling switch mechanism 6 is arranged on the lower side of the electrolyte storage chamber 2, the refilling switch mechanism 6 can be opened by means of pressure difference, and after opening, the second electrolyte flows into the shell 1 through the refilling port 5. In addition, a long cycle battery is also provided. The long cycle battery adopts the above-mentioned square battery shell, and the electrolyte can be replenished in time, thereby extending the service life of the long cycle battery. Specifically, before the battery cell is assembled, the shell 1 adds the second electrolyte into the electrolyte storage chamber 2 through the injection hole 3. Under the action of the sealer 4 and the refill switch mechanism 6, the second electrolyte will not flow out of the electrolyte storage chamber 2. Then the first electrolyte is injected into the shell 1 to complete the assembly of the long cycle battery. The long cycle battery uses the first electrolyte in the early stage of the cycle. In the later stage of the cycle, as the first electrolyte is consumed, gas will gradually be generated. When the internal gas pressure of the shell 1 is greater than the internal pressure of the electrolyte storage chamber 2, the refill switch mechanism 6 will be opened, the spring 7 will be deformed, and it will drive the sealing block 8 to separate from the refill port 5. At this time, the electrolyte storage chamber 2 is interconnected with the inside of the shell 1, so that the second electrolyte in the electrolyte storage chamber 2 enters the inside of the shell 1, thereby achieving the effect of refilling.

[0031] The following examples further illustrate:

[0032] Example 1: The battery capacity is 166Ah. After winding, shaping and welding the pole ear, it is assembled (the electrolyte storage chamber has a second electrolyte). 680g of the first electrolyte is injected into the shell. The first electrolyte ratio is EC:PC:EMC:LiPF6:VC:MMDS=30:5:65:12.5:2.5:0.3. After sealing, it is chemically divided into capacities and then cycle tested.

[0033] Example 2: The battery capacity is 166Ah. After winding, shaping and welding the pole ear, it is assembled (the electrolyte storage chamber has a second electrolyte), 680g of the first electrolyte is injected into the shell, and the first electrolyte ratio is EC:PC:EMC:LiPF6:VC:MMDS:FEC=30:5:65:12.5:2:0.3:0.5. After sealing, it is chemically divided into capacities and then cycle tested;

[0034] Comparative example: The battery capacity is 166Ah. After winding, shaping and welding the pole ears, the battery is assembled. 680g of the first electrolyte is injected into the shell. The first electrolyte ratio is EC:PC:EMC:LiPF6:VC:MMDS=30:5:65:12.5:2.5:0.3. After sealing, the battery is chemically divided into different capacities and then subjected to cycle testing.

[0035] The test results are shown in Table 1:

[0036] Solution Category Capacity retention rate Example 1 92.34％ Example 2 92.26％ Comparative Example 86.71％

[0037] Table 1: Capacity retention after 3000 cycles at 0.5C

[0038] It can be seen from the above examples that the batteries in Examples 1 and 2 adopt the structure of the utility model, even if the first electrolyte ratio is different, but the capacity retention rate is better than the control example which does not adopt the structure of the utility model.

Claims

1. A square battery housing, comprising a housing, characterized in that: The shell has four corners with electrolyte storage chambers, an injection hole is provided on the upper side of the electrolyte storage chamber, a sealer is provided inside the injection hole, a refilling port is provided on the lower side of the electrolyte storage chamber, a refilling switch mechanism for controlling the opening and closing of the refilling port is provided inside the refilling port, a first electrolyte is provided inside the shell, and a second electrolyte is provided inside the electrolyte storage chamber.

2. A housing according to claim 1, characterized in that: The shell is a rectangular structure with one side open.

3. A housing according to claim 1, characterized in that: The sealer type is a rubber plug.

4. A housing according to claim 1, characterized in that: The liquid replenishment switch mechanism includes a sealing block and a spring sheet. The sealing block cooperates with the liquid replenishment port, and the sealing block is connected to the electrolyte storage chamber through the spring sheet.

5. A long cycle battery, characterized in that: The long cycle battery adopts the square battery casing as described in any one of claims 1-4.

Images