Battery and battery pack

Abstract

The utility model belongs to the technical field of battery production, and particularly relates to a battery, which comprises a shell, a battery cover and a battery cover, the battery cell is mounted in the shell, and the battery cell comprises a mounting hole penetrating through the battery cell in the first direction; the positive pole column is mounted at one end of the shell along the first direction and is connected with the battery cell; the negative pole is mounted at the other end of the shell along the first direction and is connected with the battery cell; the liquid storage air bag is mounted in the shell and located in the mounting hole; a self-adaptive air hole for absorbing or discharging liquid is formed in the liquid storage air bag; the battery has the beneficial effects that the liquid storage air bag is arranged in the battery shell, the self-adaptive air hole is formed in the liquid storage air bag, and the liquid storage air bag can absorb and store part of electrolyte injected into the shell, so that the space utilization rate in the shell is improved, and after a battery cell is infiltrated by the electrolyte, the self-adaptive air hole is formed in the battery shell; and the liquid storage air bag can automatically discharge the absorbed electrolyte into the shell for supplementing, so that the liquid injection time of the battery is shortened, and the production efficiency of the battery is improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery manufacturing technology, and in particular relates to a battery and battery pack. Background Technology

[0002] In the battery manufacturing process, injecting electrolyte into the battery casing is a very important step. The amount of electrolyte injected during the injection process is related to the space utilization rate inside the battery casing and the degree of electrolyte absorption by the battery cell.

[0003] Because the electrolyte does not completely fill the entire battery casing after being injected, a small amount of electrolyte will remain in the later stages of injection and is difficult to inject into the battery. Forcing injection can easily cause the battery casing to bulge. It is necessary to wait until the battery cell is completely soaked in electrolyte before injection can continue. This results in a very long electrolyte injection time and low production efficiency. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned technical problems by providing a battery and battery pack to solve them.

[0005] In view of the above, the present invention provides a battery comprising:

[0006] The casing has a liquid injection port.

[0007] The battery cell is installed inside the housing, and the battery cell includes a mounting hole that extends through the battery cell in a first direction;

[0008] The positive terminal is mounted on one end of the housing along the first direction and is connected to the battery cell;

[0009] The negative terminal is installed on the other end of the housing along the first direction and is connected to the battery cell;

[0010] Liquid reservoir airbag, which is installed inside the housing and located in the mounting hole;

[0011] The liquid storage bladder is equipped with adaptive pores for absorbing or discharging liquid.

[0012] Furthermore, both the positive and negative terminals are plugged into the mounting holes.

[0013] Furthermore, the positive terminal includes:

[0014] The first groove is located on the end face of the positive electrode post near the battery cell.

[0015] One end of the liquid storage bladder along the first direction is disposed in the first groove and connected to the positive electrode post.

[0016] Furthermore, the negative terminal includes:

[0017] The second groove is located on the end face of the negative terminal near the battery cell.

[0018] The liquid storage bladder is located at the other end of the first direction within the second groove and connected to the negative electrode post.

[0019] Furthermore, the adaptive vent is located in the middle of the liquid storage bladder.

[0020] Furthermore, there are multiple adaptive pores.

[0021] Furthermore, the adaptive pores have a multi-lobed structure with fine striations between each pair of lobes.

[0022] Furthermore, the battery cells include:

[0023] Several electrode plates, each with a post hole;

[0024] In this process, several electrode sheets are stacked along the first direction to form a battery cell, and several terminal holes are stacked along the first direction to form mounting holes.

[0025] Furthermore, the liquid-filled airbag is made of a malleable material.

[0026] A battery pack comprising any of the batteries described above.

[0027] The beneficial effects of this utility model are:

[0028] By installing a liquid storage bladder inside the battery casing, and setting adaptive air holes on the bladder, the liquid storage bladder can absorb and store part of the electrolyte injected into the casing, improving the space utilization rate inside the casing. After the battery cell is wetted by electrolyte, the liquid storage bladder will automatically discharge the absorbed electrolyte into the casing for replenishment, reducing the battery's electrolyte injection time and improving the battery's production efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the battery structure in this utility model;

[0030] Figure 2 This is a schematic diagram of the connection structure between the battery cell and the positive and negative terminals in this utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the electrode sheet in this utility model;

[0032] Figure 4 This is a schematic diagram of the battery cell structure in this utility model;

[0033] Figure 5 This is a schematic diagram of the adaptive pore structure in this utility model;

[0034] The markings in the diagram are as follows:

[0035] 1. Housing; 2. Battery cell; 21. Mounting hole; 22. Tab; 3. Positive terminal; 31. First groove; 4. Negative terminal; 42. Second groove; 5. Liquid reservoir; 51. Adaptive vent; X, First direction. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0038] Example 1:

[0039] This embodiment provides a battery, including:

[0040] Housing 1, with a liquid injection hole provided on housing 1;

[0041] Battery cell 2 is installed inside housing 1, and battery cell 2 includes a mounting hole 21 that extends through battery cell 2 along the first direction X;

[0042] Positive terminal 3 is mounted on one end of housing 1 along the first direction X and connected to cell 2;

[0043] The negative terminal 4 is installed on the other end of the housing 1 along the first direction X and is connected to the battery cell 2.

[0044] Liquid storage bladder 5 is installed inside the housing 1 and located in the mounting hole 21;

[0045] The liquid storage bladder 5 is provided with an adaptive vent 51 for absorbing or discharging liquid.

[0046] Furthermore, cell 2 includes:

[0047] Several electrode plates, each with a post hole;

[0048] Among them, a number of electrode sheets are stacked along the first direction X to form a battery cell 2, and a number of terminal holes are stacked along the first direction X to form a mounting hole 21.

[0049] Furthermore, the adaptive pore 51 has a multi-lobed structure with fine striations between each pair of lobes.

[0050] In this technical solution, the positive and negative electrode sheets are as follows: Figure 3 As shown, a terminal hole is provided in the middle of the electrode sheet, and the electrode tab 22 inside the electrode sheet is set at the terminal hole; the positive and negative electrodes are stacked alternately to form the battery cell 2, and multiple terminal holes are stacked to form the mounting hole 21 of the battery cell 2.

[0051] like Figure 1 As shown, the battery cell 2 is disposed inside the battery casing 1, and the liquid storage bladder 5 is located inside the mounting hole 21 of the battery cell 2, which serves to limit the liquid storage bladder 5. The positive terminal 3 and the negative terminal 4 are mounted on the casing 1, as shown. Figure 2 As shown, the positive terminal 3 is located at one end of the battery cell along the first direction X and is connected to the positive terminal of the battery cell, and the negative terminal 4 is located at the other end of the battery cell along the first direction X and is connected to the negative terminal of the battery cell.

[0052] During the battery electrolyte filling process, negative pressure is first applied to the inside of the casing 1 through the filling hole. Under this negative pressure, the liquid storage bladder 5 will expel the internal gas through the adaptive vent 51. The adaptive vent 51 is a multi-lobed structure located on the liquid storage bladder 5. Figure 5 As shown, it can be a four-lobed structure with fine striations between each pair of lobes. Due to the small openings, it has good sealing properties, and the multi-lobed structure will only crack inward or outward under external force.

[0053] Then, when the electrolyte is injected, the reservoir bladder 5 will draw the electrolyte into its interior and store it. It is worth mentioning that the amount of stored electrolyte will not affect the amount of electrolyte that can be injected into the battery casing 1. That is, the reservoir bladder 5 can improve the space utilization rate inside the battery casing 1.

[0054] After the battery is properly filled with electrolyte, as the cell 2 is immersed, some of the electrolyte is gradually absorbed by the cell 2, causing a negative pressure to be generated inside the casing 1. This allows the electrolyte in the storage bladder 5 to be discharged outward through the adaptive vent 51, thereby replenishing the amount of electrolyte absorbed by the cell 2 without the need for secondary filling.

[0055] In summary, by installing a liquid storage bladder 5 inside the battery casing 1, and the liquid storage bladder 5 being equipped with an adaptive vent 51, the liquid storage bladder 5 can absorb and store a portion of the electrolyte injected into the casing 1, thereby improving the space utilization rate inside the casing 1. After the battery cell 2 is soaked in electrolyte, the liquid storage bladder 5 will automatically discharge the absorbed electrolyte into the casing 1 for replenishment, effectively reducing the battery's electrolyte injection time and improving the battery's production efficiency.

[0056] Example 2:

[0057] This embodiment provides a battery that, based on the technical solutions provided in any of the above embodiments, also has the following technical features.

[0058] Furthermore, both the positive terminal 3 and the negative terminal 4 are plugged into the mounting hole 21.

[0059] In this technical solution, the positive terminal 3 and the negative terminal 4 are respectively installed on both ends of the battery cell 2 along the first direction X, and are inserted into the mounting hole 21. The positive tab on the end of the battery cell 2 that is inserted into the positive terminal 3 is in contact with the positive terminal, and further, the positive tab is welded to the positive terminal. The negative tab on the end of the battery cell 2 that is inserted into the negative terminal 4 is in contact with the negative terminal, or the negative tab 22 is directly welded to the negative terminal. In summary, the connection between the positive terminal 3, the negative terminal 4, and the battery cell 2 is achieved, and the connection stability between the positive terminal 3, the negative terminal 4, and the battery cell 2 is effectively improved.

[0060] It is worth mentioning that in the portion of cell 2 near the positive terminal, the terminal hole of the negative electrode is slightly larger than that of the positive electrode; conversely, in the portion of cell 2 near the negative terminal, the terminal hole of the positive electrode is slightly larger than that of the negative electrode. This structural design effectively prevents accidental contact between the positive terminal 3 and the negative electrode tab of the cell near the positive terminal 3, and also prevents accidental contact between the negative terminal 4 and the positive electrode tab of the cell near the negative terminal 4, thus improving safety during use.

[0061] Example 3:

[0062] This embodiment provides a battery that, based on the technical solutions provided in any of the above embodiments, also has the following technical features.

[0063] Furthermore, the positive terminal 3 includes:

[0064] The first groove 31 is disposed on the end face of the positive electrode post 3 near the cell 2;

[0065] The liquid storage bladder 5 is disposed at one end in the first groove 31 along the first direction X and is connected to the positive electrode post 3.

[0066] Furthermore, the negative terminal 4 includes:

[0067] The second groove 42 is disposed on the end face of the negative electrode post 4 near the cell 2;

[0068] The liquid storage bladder 5 is disposed at the other end of the first direction X within the second groove 42 and connected to the negative electrode post 4.

[0069] In this technical solution, a raised structure is provided on the surface of the liquid storage bladder 5, and an adhesive is coated on the bottom of the positive electrode post 3 and the negative electrode post 4. When the positive electrode post 3 and the negative electrode post 4 are inserted into the mounting hole 21 of the battery cell 2, the positive electrode post 3 and the negative electrode post 4 are bonded and fixed to the raised structure on the surface of the liquid storage bladder 5, thereby realizing the connection and fixation between the liquid storage bladder 5 and the positive electrode post 3 and the negative electrode post 4.

[0070] The first groove 31 on the positive electrode post 3 is set to wrap one end of the liquid storage bladder 5, and the second groove 42 on the negative electrode post 4 is set to wrap the other end of the liquid storage bladder 5. The end of the liquid storage bladder 5 is not interference-fitted with the first groove 31 and the second groove 42. The end of the liquid storage bladder 5 is slightly smaller than the space of the first groove 31 and the second groove 42. When the liquid storage bladder 5 absorbs electrolyte and expands, it can fill the first groove 31 and the second groove 42.

[0071] Example 4:

[0072] This embodiment provides a battery that, based on the technical solutions provided in the above embodiments, also has the following technical features.

[0073] Furthermore, the adaptive vent 51 is located in the middle of the liquid storage bladder 5. The liquid storage bladder 5 is disposed within the mounting hole 21 of the battery cell 2, and there is a certain space between the liquid storage bladder 5 and the battery cell 2. The two ends of the liquid storage bladder 5 along the first direction X are respectively located in the first groove 31 of the positive electrode post 3 and the second groove 42 of the negative electrode post 4. By placing the adaptive vent 51 in the middle of the liquid storage bladder 5, interference from the positive electrode post 3 and the negative electrode post 4 can be avoided when the liquid storage bladder 5 absorbs and discharges electrolyte, ensuring that the liquid storage bladder 5 can absorb and discharge electrolyte more smoothly.

[0074] Furthermore, there are multiple adaptive vents 51. By setting multiple adaptive vents 51, the absorption and discharge of electrolyte in the liquid storage bladder 5 can be more efficient, while also avoiding the failure of the liquid storage bladder 5 due to damage or blockage of a single vent, thus effectively improving its practicality.

[0075] Example 5:

[0076] This embodiment provides a battery that, based on the technical solutions provided in any of the above embodiments, also has the following technical features.

[0077] Furthermore, the liquid-filled airbag 5 is made of a malleable material.

[0078] In this technical solution, the liquid storage airbag 5 can be made of PTFE, PVC, polyurethane, rubber and other plastic materials with corrosion resistance, to ensure that the liquid storage airbag 5 can expand and contract, and at the same time ensure that the liquid storage airbag 5 will not be corroded by the electrolyte.

[0079] Example 6:

[0080] This embodiment provides a battery pack, including the battery described in any one of embodiments 1-5 above.

[0081] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A battery, characterized in that, include: The housing (1) is provided with a liquid injection hole; A battery cell (2) is installed inside a housing (1), and the battery cell (2) includes a mounting hole (21) extending through the battery cell (2) along a first direction (X); Positive terminal (3), the positive terminal (3) is installed on one end of the housing (1) along the first direction (X) and is connected to the battery cell (2); The negative terminal (4) is installed on the other end of the housing (1) along the first direction (X) and is connected to the battery cell (2); Liquid storage airbag (5), which is installed inside the housing (1) and located in the mounting hole (21); The liquid storage bladder (5) is provided with an adaptive vent (51) for absorbing or discharging liquid.

2. The battery according to claim 1, characterized in that, Both the positive terminal (3) and the negative terminal (4) are plugged into the mounting hole (21).

3. The battery according to claim 1, characterized in that, The positive terminal (3) includes: The first groove (31) is disposed on the end face of the positive electrode post (3) near the cell (2); The liquid storage bladder (5) is disposed at one end along the first direction (X) in the first groove (31) and connected to the positive electrode post (3).

4. The battery according to claim 3, characterized in that, The negative terminal (4) includes: The second groove (42) is disposed on the end face of the negative electrode post (4) near the cell (2); The liquid storage bladder (5) is disposed at the other end along the first direction (X) in the second groove (42) and connected to the negative electrode post (4).

5. The battery according to claim 1, characterized in that, The adaptive vent (51) is located in the middle of the liquid storage bladder (5).

6. The battery according to claim 1, characterized in that, The adaptive pores (51) are multiple.

7. The battery according to claim 1, characterized in that, The adaptive pore (51) has a multi-lobed structure with fine striations between each pair of lobes.

8. The battery according to claim 1, characterized in that, The battery cell (2) includes: A plurality of electrode plates, each of which is provided with an electrode post hole; Among them, a number of electrode sheets are stacked along the first direction (X) to form a battery cell (2), and a number of terminal holes are stacked along the first direction (X) to form a mounting hole (21).

9. The battery according to claim 1, characterized in that, The liquid storage airbag (5) is made of a malleable material.

10. A battery pack comprising the battery according to any one of claims 1-8.

Images